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authorRichard Carlsson <[email protected]>2011-07-19 12:05:29 +0200
committerRichard Carlsson <[email protected]>2011-09-25 17:04:08 +0200
commit756f30146091d0383566b5291a85cc6c4198869b (patch)
tree31481554dfdfee1e2294b523d509b35ed10bf5af /lib
parent53cf0b70c705e0bf6c09f83f2ce2709d79593ce6 (diff)
downloadotp-756f30146091d0383566b5291a85cc6c4198869b.tar.gz
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-rw-r--r--lib/eunit/AUTHORS2
-rw-r--r--lib/eunit/doc/.gitignore4
-rw-r--r--lib/eunit/doc/edoc-info3
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-rw-r--r--lib/eunit/doc/eunit_surefire.html78
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-rw-r--r--lib/eunit/doc/modules-frame.html13
-rw-r--r--lib/eunit/doc/overview-summary.html1032
-rw-r--r--lib/eunit/doc/packages-frame.html11
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11 files changed, 4 insertions, 1282 deletions
diff --git a/lib/eunit/AUTHORS b/lib/eunit/AUTHORS
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@@ -1,2 +0,0 @@
-Richard Carlsson <[email protected]>
-Micka�l R�mond <[email protected]>
diff --git a/lib/eunit/doc/.gitignore b/lib/eunit/doc/.gitignore
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+++ b/lib/eunit/doc/.gitignore
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+*.html
+stylesheet.css
+erlang.png
+edoc-info
diff --git a/lib/eunit/doc/edoc-info b/lib/eunit/doc/edoc-info
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-{application,eunit}.
-{packages,[]}.
-{modules,[eunit,eunit_surefire]}.
diff --git a/lib/eunit/doc/erlang.png b/lib/eunit/doc/erlang.png
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diff --git a/lib/eunit/doc/eunit.html b/lib/eunit/doc/eunit.html
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+++ /dev/null
@@ -1,71 +0,0 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<title>Module eunit</title>
-<link rel="stylesheet" type="text/css" href="stylesheet.css" title="EDoc">
-</head>
-<body bgcolor="white">
-<div class="navbar"><a name="#navbar_top"></a><table width="100%" border="0" cellspacing="0" cellpadding="2" summary="navigation bar"><tr><td><a href="overview-summary.html" target="overviewFrame">Overview</a></td><td><a href="http://www.erlang.org/"><img src="erlang.png" align="right" border="0" alt="erlang logo"></a></td></tr></table></div>
-<hr>
-
-<h1>Module eunit</h1>
-<ul class="index"><li><a href="#description">Description</a></li><li><a href="#index">Function Index</a></li><li><a href="#functions">Function Details</a></li></ul>This module is the main EUnit user interface.
-<p>Copyright � 2004-2009 Micka�l R�mond, Richard Carlsson</p>
-
-<p><b>Version:</b> 2.1.1, Apr 22 2009 22:37:19</p>
-<p><b>Authors:</b> Micka�l R�mond (<a href="mailto:[email protected]"><tt>[email protected]</tt></a>) [<em>web site:</em> <tt><a href="http://www.process-one.net/" target="_top">http://www.process-one.net/</a></tt>], Richard Carlsson (<a href="mailto:[email protected]"><tt>[email protected]</tt></a>) [<em>web site:</em> <tt><a href="http://user.it.uu.se/~richardc/" target="_top">http://user.it.uu.se/~richardc/</a></tt>].</p>
-
-<h2><a name="description">Description</a></h2>This module is the main EUnit user interface.
-<h2><a name="index">Function Index</a></h2>
-<table width="100%" border="1" cellspacing="0" cellpadding="2" summary="function index"><tr><td valign="top"><a href="#start-0">start/0</a></td><td>Starts the EUnit server.</td></tr>
-<tr><td valign="top"><a href="#stop-0">stop/0</a></td><td>Stops the EUnit server.</td></tr>
-<tr><td valign="top"><a href="#test-1">test/1</a></td><td>Equivalent to <a href="#test-2"><tt>test(Tests, [])</tt></a>.
-</td></tr>
-<tr><td valign="top"><a href="#test-2">test/2</a></td><td>Runs a set of tests.</td></tr>
-</table>
-
-<h2><a name="functions">Function Details</a></h2>
-
-<h3 class="function"><a name="start-0">start/0</a></h3>
-<div class="spec">
-<p><tt>start() -&gt; any()</tt></p>
-</div><p>Starts the EUnit server. Normally, you don't need to call this
- function; it is started automatically.</p>
-
-<h3 class="function"><a name="stop-0">stop/0</a></h3>
-<div class="spec">
-<p><tt>stop() -&gt; any()</tt></p>
-</div><p>Stops the EUnit server. Normally, you don't need to call this
- function.</p>
-
-<h3 class="function"><a name="test-1">test/1</a></h3>
-<div class="spec">
-<p><tt>test(Tests) -&gt; any()</tt></p>
-</div><p>Equivalent to <a href="#test-2"><tt>test(Tests, [])</tt></a>.</p>
-
-
-<h3 class="function"><a name="test-2">test/2</a></h3>
-<div class="spec">
-<p><tt>test(Tests::term(), Options::[term()]) -&gt; ok | {error, term()}</tt></p>
-</div><p><p>Runs a set of tests. The format of <code>Tests</code> is described in the
- section <a href="overview-summary.html#EUnit_test_representation">EUnit test
- representation</a> of the overview.</p>
-
- Example: <pre> eunit:test(fred)</pre><p> runs all tests in the module <code>fred</code>
- and also any tests in the module <code>fred_tests</code>, if that module exists.</p>
-
- Options:
- <dl>
- <dt><code>verbose</code></dt>
- <dd>Displays more details about the running tests.</dd>
- </dl>
-
- Options in the environment variable EUNIT are also included last in
- the option list, i.e., have lower precedence than those in <code>Options</code>.</p>
-<p><b>See also:</b> <a href="#test-1">test/1</a>.</p>
-<hr>
-
-<div class="navbar"><a name="#navbar_bottom"></a><table width="100%" border="0" cellspacing="0" cellpadding="2" summary="navigation bar"><tr><td><a href="overview-summary.html" target="overviewFrame">Overview</a></td><td><a href="http://www.erlang.org/"><img src="erlang.png" align="right" border="0" alt="erlang logo"></a></td></tr></table></div>
-<p><i>Generated by EDoc, Apr 22 2009, 22:37:19.</i></p>
-</body>
-</html>
diff --git a/lib/eunit/doc/eunit_surefire.html b/lib/eunit/doc/eunit_surefire.html
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--- a/lib/eunit/doc/eunit_surefire.html
+++ /dev/null
@@ -1,78 +0,0 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<title>Module eunit_surefire</title>
-<link rel="stylesheet" type="text/css" href="stylesheet.css" title="EDoc">
-</head>
-<body bgcolor="white">
-<div class="navbar"><a name="#navbar_top"></a><table width="100%" border="0" cellspacing="0" cellpadding="2" summary="navigation bar"><tr><td><a href="overview-summary.html" target="overviewFrame">Overview</a></td><td><a href="http://www.erlang.org/"><img src="erlang.png" align="right" border="0" alt="erlang logo"></a></td></tr></table></div>
-<hr>
-
-<h1>Module eunit_surefire</h1>
-<ul class="index"><li><a href="#description">Description</a></li><li><a href="#index">Function Index</a></li><li><a href="#functions">Function Details</a></li></ul>Surefire reports for EUnit (Format used by Maven and Atlassian
-Bamboo for example to integrate test results).
-<p>Copyright � 2009 Micka�l R�mond, Paul Guyot</p>
-
-<p><b>Behaviours:</b> <a href="eunit_listener.html"><tt>eunit_listener</tt></a>.</p>
-<p><b>Authors:</b> Micka�l R�mond (<a href="mailto:[email protected]"><tt>[email protected]</tt></a>).</p>
-<p><b>See also:</b> <a href="eunit.html">eunit</a>.</p>
-
-<h2><a name="description">Description</a></h2><p>Surefire reports for EUnit (Format used by Maven and Atlassian
-Bamboo for example to integrate test results). Based on initial code
-from Paul Guyot.</p>
-
- Example: Generate XML result file in the current directory:
- <pre> eunit:test([fib, eunit_examples],
- [{report,{eunit_surefire,[{dir,"."}]}}]).</pre>
-<h2><a name="index">Function Index</a></h2>
-<table width="100%" border="1" cellspacing="0" cellpadding="2" summary="function index"><tr><td valign="top"><a href="#handle_begin-3">handle_begin/3</a></td><td></td></tr>
-<tr><td valign="top"><a href="#handle_cancel-3">handle_cancel/3</a></td><td></td></tr>
-<tr><td valign="top"><a href="#handle_end-3">handle_end/3</a></td><td></td></tr>
-<tr><td valign="top"><a href="#init-1">init/1</a></td><td></td></tr>
-<tr><td valign="top"><a href="#start-0">start/0</a></td><td></td></tr>
-<tr><td valign="top"><a href="#start-1">start/1</a></td><td></td></tr>
-<tr><td valign="top"><a href="#terminate-2">terminate/2</a></td><td></td></tr>
-</table>
-
-<h2><a name="functions">Function Details</a></h2>
-
-<h3 class="function"><a name="handle_begin-3">handle_begin/3</a></h3>
-<div class="spec">
-<p><tt>handle_begin(X1, Data, St) -&gt; any()</tt></p>
-</div>
-
-<h3 class="function"><a name="handle_cancel-3">handle_cancel/3</a></h3>
-<div class="spec">
-<p><tt>handle_cancel(X1, Data, St) -&gt; any()</tt></p>
-</div>
-
-<h3 class="function"><a name="handle_end-3">handle_end/3</a></h3>
-<div class="spec">
-<p><tt>handle_end(X1, Data, St) -&gt; any()</tt></p>
-</div>
-
-<h3 class="function"><a name="init-1">init/1</a></h3>
-<div class="spec">
-<p><tt>init(Options) -&gt; any()</tt></p>
-</div>
-
-<h3 class="function"><a name="start-0">start/0</a></h3>
-<div class="spec">
-<p><tt>start() -&gt; any()</tt></p>
-</div>
-
-<h3 class="function"><a name="start-1">start/1</a></h3>
-<div class="spec">
-<p><tt>start(Options) -&gt; any()</tt></p>
-</div>
-
-<h3 class="function"><a name="terminate-2">terminate/2</a></h3>
-<div class="spec">
-<p><tt>terminate(X1, St) -&gt; any()</tt></p>
-</div>
-<hr>
-
-<div class="navbar"><a name="#navbar_bottom"></a><table width="100%" border="0" cellspacing="0" cellpadding="2" summary="navigation bar"><tr><td><a href="overview-summary.html" target="overviewFrame">Overview</a></td><td><a href="http://www.erlang.org/"><img src="erlang.png" align="right" border="0" alt="erlang logo"></a></td></tr></table></div>
-<p><i>Generated by EDoc, Apr 22 2009, 22:37:19.</i></p>
-</body>
-</html>
diff --git a/lib/eunit/doc/index.html b/lib/eunit/doc/index.html
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<title>The eunit application</title>
-</head>
-<frameset cols="20%,80%">
-<frame src="modules-frame.html" name="modulesFrame" title="">
-
-<frame src="overview-summary.html" name="overviewFrame" title="">
-<noframes>
-<h2>This page uses frames</h2>
-<p>Your browser does not accept frames.
-<br>You should go to the <a href="overview-summary.html">non-frame version</a> instead.
-</p>
-</noframes>
-</frameset>
-</html> \ No newline at end of file
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<title>The eunit application</title>
-<link rel="stylesheet" type="text/css" href="stylesheet.css" title="EDoc">
-</head>
-<body bgcolor="white">
-<h2 class="indextitle">Modules</h2>
-<table width="100%" border="0" summary="list of modules">
-<tr><td><a href="eunit.html" target="overviewFrame" class="module">eunit</a></td></tr>
-<tr><td><a href="eunit_surefire.html" target="overviewFrame" class="module">eunit_surefire</a></td></tr></table>
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diff --git a/lib/eunit/doc/overview-summary.html b/lib/eunit/doc/overview-summary.html
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<title>EUnit - a Lightweight Unit Testing Framework for Erlang
-</title>
-<link rel="stylesheet" type="text/css" href="stylesheet.css" title="EDoc">
-</head>
-<body bgcolor="white">
-<div class="navbar"><a name="#navbar_top"></a><table width="100%" border="0" cellspacing="0" cellpadding="2" summary="navigation bar"><tr><td><a href="overview-summary.html" target="overviewFrame">Overview</a></td><td><a href="http://www.erlang.org/"><img src="erlang.png" align="right" border="0" alt="erlang logo"></a></td></tr></table></div>
-<h1>EUnit - a Lightweight Unit Testing Framework for Erlang
-</h1>
-<p>Copyright � 2004-2007 Micka�l R�mond, Richard Carlsson</p>
-<p><b>Version:</b> 2.1.1, Apr 22 2009 22:37:19
-</p>
-<p><b>Authors:</b> Richard Carlsson (<a href="mailto:[email protected]"><tt>[email protected]</tt></a>) [<em>web site:</em> <tt><a href="http://user.it.uu.se/~richardc/" target="_top">http://user.it.uu.se/~richardc/</a></tt>], Micka�l R�mond (<a href="mailto:[email protected]"><tt>[email protected]</tt></a>) [<em>web site:</em> <tt><a href="http://www.process-one.net/" target="_top">http://www.process-one.net/</a></tt>].</p>
-<p>EUnit is a unit testing framework for Erlang. It is very powerful
-and flexible, is easy to use, and has small syntactical overhead.</p>
-
-<ul>
-<li><a href="#Unit_testing">Unit testing</a></li>
-<li><a href="#Terminology">Terminology</a></li>
-<li><a href="#Getting_started">Getting started</a></li>
-<li><a href="#EUnit_macros">EUnit macros</a></li>
-<li><a href="#EUnit_test_representation">EUnit test representation</a></li>
-</ul>
-
-<p>EUnit builds on ideas from the family of unit testing frameworks for
-Object Oriented languages that originated with JUnit by Beck and Gamma
-(and Beck's previous framework SUnit for Smalltalk). However, EUnit uses
-techniques more adapted to functional and concurrent programming, and is
-typically less verbose than its relatives.</p>
-
-<p>Although EUnit uses many preprocessor macros, they have been designed to
-be as nonintrusive as possible, and should not cause conflicts with
-existing code. Adding EUnit tests to a module should thus not normally
-require changing existing code. Furthermore, tests that only exercise
-the exported functions of a module can always be placed in a completely
-separate module, avoiding any conflicts entirely.</p>
-
-<h3><a name="Unit_testing">Unit testing</a></h3>
-
-<p>Unit Testing is testing of individual program "units" in relative
-isolation. There is no particular size requirement: a unit can be a
-function, a module, a process, or even a whole application, but the most
-typical testing units are individual functions or modules. In order to
-test a unit, you specify a set of individual tests, set up the smallest
-necessary environment for being able to run those tests (often, you
-don't need to do any setup at all), you run the tests and collect the
-results, and finally you do any necessary cleanup so that the test can
-be run again later. A Unit Testing Framework tries to help you in each
-stage of this process, so that it is easy to write tests, easy to run
-them, and easy to see which tests failed (so you can fix the bugs).</p>
-
-<h4><a name="Advantages_of_unit_testing">Advantages of unit testing</a></h4>
-
-<dl>
- <dt>Reduces the risks of changing the program</dt>
- <dd>Most programs will be modified during their lifetime: bugs will be
- fixed, features will be added, optimizations may become necessary, or
- the code will need to be refactored or cleaned up in other ways to
- make it easier to work with. But every change to a working program is
- a risk of introducing new bugs - or reintroducing bugs that had
- previously been fixed. Having a set of unit tests that you can run
- with very little effort makes it easy to know that the code still
- works as it should (this use is called <em>regression testing</em>;
- see <a href="#Terminology">Terminology</a>). This goes a long way to reduce the
- resistance to changing and refactoring code.</dd>
- <dt>Helps guide and speed up the development process</dt>
- <dd>By focusing on getting the code to pass the tests, the programmer
- can become more productive, not overspecify or get lost in premature
- optimizations, and create code that is correct from the very beginning
- (so-called <em>test-driven development</em>; see <a href="#Terminology">Terminology</a>).</dd>
- <dt>Helps separate interface from implementation</dt>
- <dd>When writing tests, the programmer may discover dependencies
- (in order to get the tests to run) that ought not to be there, and
- which need to be abstracted away to get a cleaner design. This helps
- eliminate bad dependencies before they spread throughout the
- code.</dd>
- <dt>Makes component integration easier</dt>
- <dd>By testing in a bottom-up fashion, beginning with the smallest
- program units and creating a confidence in that they work as they
- should, it becomes easier to test that a higher-level component,
- consisting of several such units, also behaves according to
- specification (known as <em>integration testing</em>; see <a href="#Terminology">Terminology</a>).</dd>
- <dt>Is self-documenting</dt>
- <dd>The tests can be read as documentation, typically showing both
- examples of correct and incorrect usage, along with the expected
- consequences.</dd>
-</dl>
-
-<h3><a name="Terminology">Terminology</a></h3>
-
-<dl>
- <dt>Unit testing</dt>
- <dd>Testing that a program unit behaves as it is supposed to do (in
- itself), according to its specifications. Unit tests have an important
- function as regression tests, when the program later is modified for
- some reason, since they check that the program still behaves according
- to specification.</dd>
- <dt>Regression testing</dt>
- <dd>Running a set of tests after making changes to a program, to check
- that the program behaves as it did before the changes (except, of
- course, for any intentional changes in behaviour). Unit tests are
- important as regression tests, but regression testing can involve more
- than just unit testing, and may also test behaviour that might not be
- part of the normal specification (such as bug-for-bug-compatibility).
- </dd>
- <dt>Integration testing</dt>
- <dd>Testing that a number of individually developed program units
- (assumed to already have been separately unit tested) work together as
- expected. Depending on the system being developed, integration testing
- may be as simple as "just another level of unit testing", but might
- also involve other kinds of tests (compare <em>system testing</em>).
-</dd>
- <dt>System testing</dt>
- <dd>Testing that a complete system behaves according to its
- specification. Specifically, system testing should not require knowing
- any details about the implementation. It typically involves testing
- many different aspects of the system behaviour apart from the basic
- functionality, such as performance, usability, and reliability.</dd>
- <dt>Test-driven development</dt>
- <dd>A program development technique where you continuously write tests
- <em>before</em> you implement the code that is supposed to pass those
- tests. This can help you focus on solving the right problems, and not
- make a more complicated implementation than necessary, by letting the
- unit tests determine when a program is "done": if it fulfils its
- specifications, there is no need to keep adding functionality.</dd>
- <dt>Mock object</dt>
- <dd>Sometimes, testing some unit <code>A</code> (e.g., a function) requires that
- it collaborates somehow with some other unit <code>B</code> (perhaps being passed
- as an argument, or by reference) - but <code>B</code> has not been implemented
- yet. A "mock object" - an object which, for the purposes of testing
- <code>A</code>, looks and behaves like a real <code>B</code> - might then be used instead.
- (This is of course only useful if it would be significantly more work
- to implement a real <code>B</code> than to create a mock object.)</dd>
- <dt>Test case</dt>
- <dd>A single, well-defined test, that somehow can be uniquely
- identified. When executed, the test case either <em>passes</em> or
- <em>fails</em>; the test report should identify exactly which test
- cases failed.</dd>
- <dt>Test suite</dt>
- <dd>A collection of test cases, generally with a specific, common
- target for testing, such as a single function, module, or subsystem. A
- test suite may also be recursively composed by smaller test
- suites.</dd>
-</dl>
-
-<h3><a name="Getting_started">Getting started</a></h3>
-<ul>
- <li><a href="#Including_the_EUnit_header_file">Including the EUnit header file</a></li>
- <li><a href="#Writing_simple_test_functions">Writing simple test functions</a></li>
- <li><a href="#Running_EUnit">Running EUnit</a></li>
- <li><a href="#Writing_test_generating_functions">Writing test generating functions</a></li>
- <li><a href="#An_example">An example</a></li>
- <li><a href="#Disabling_testing">Disabling testing</a></li>
- <li><a href="#Avoiding_compile-time_dependency_on_EUnit">Avoiding compile-time dependency on EUnit</a></li>
-</ul>
-
-<h4><a name="Including_the_EUnit_header_file">Including the EUnit header file</a></h4>
-
-The simplest way to use EUnit in an Erlang module is to add the
-following line at the beginning of the module (after the <code>-module</code>
-declaration, but before any function definitions):
-<pre> -include_lib("eunit/include/eunit.hrl").</pre>
-
-This will have the following effect:
-<ul>
- <li>Creates an exported function <code>test()</code> (unless testing is turned
- off, and the module does not already contain a test() function), that
- can be used to run all the unit tests defined in the module</li>
- <li>Causes all functions whose names match <code>..._test()</code> or <code>..._test_()</code>
- to be automatically exported from the module (unless testing is
- turned off, or the <code>EUNIT_NOAUTO</code> macro is defined)</li>
- <li>Makes all the preprocessor macros of EUnit available, to help
- writing tests</li>
-</ul>
-
-<strong>Note:</strong> For <code>-include_lib(...)</code> to work, the Erlang
-module search path <em>must</em> contain a directory whose name ends in
-<code>eunit/ebin</code> (pointing to the <code>ebin</code> subdirectory of the EUnit
-installation directory). If EUnit is installed as <code>lib/eunit</code> under your
-Erlang/OTP system directory, its <code>ebin</code> subdirectory will be
-automatically added to the search path when Erlang starts. Otherwise,
-you need to add the directory explicitly, by passing a <code>-pa</code> flag to the
-<code>erl</code> or <code>erlc</code> command. For example, a Makefile could contain the
-following action for compiling <code>.erl</code> files:
-<pre> erlc -pa "path/to/eunit/ebin" $(ERL_COMPILE_FLAGS) -o$(EBIN) $&lt;</pre>
-or if you want Eunit to always be available when you run Erlang
-interactively, you can add a line like the following to your
-<code>$HOME/.erlang</code> file:
-<pre> code:add_path("/path/to/eunit/ebin").</pre>
-
-<h4><a name="Writing_simple_test_functions">Writing simple test functions</a></h4>
-
-<p>The EUnit framework makes it extremely easy to write unit tests in
-Erlang. There are a few different ways of writing them, though, so we
-start with the simplest:</p>
-
-<p>A function with a name ending in <code>..._test()</code> is recognized by EUnit as
-a simple test function - it takes no arguments, and its execution either
-succeeds (returning some arbitrary value that EUnit will throw away), or
-fails by throwing an exception of some kind (or by not terminating, in
-which case it will be aborted after a while).</p>
-
-An example of a simple test function could be the following:
-<pre> reverse_test() -&gt; lists:reverse([1,2,3]).</pre><p>
-This just tests that the function <code>lists:reverse(List)</code> does not crash
-when <code>List</code> is <code>[1,2,3]</code>. It is not a great test, but many people write
-simple functions like this one to test the basic functionality of their
-code, and those tests can be used directly by EUnit, without changes,
-as long as their function names match.</p>
-
-<h5><a name="Use_exceptions_to_signal_failure">Use exceptions to signal failure</a></h5>
-
-To write more interesting tests, we need to make them crash (throw an
-exception) when they don't get the result they expect. A simple way of
-doing this is to use pattern matching with <code>=</code>, as in the following
-examples:
-<pre> reverse_nil_test() -&gt; [] = lists:reverse([]).
- reverse_one_test() -&gt; [1] = lists:reverse([1]).
- reverse_two_test() -&gt; [2,1] = lists:reverse([1,2]).</pre><p>
-If there was some bug in <code>lists:reverse/1</code> that made it return something
-other than <code>[2,1]</code> when it got <code>[1,2]</code> as input, then the last test
-above would throw a <code>badmatch</code> error. The first two (we assume they do
-not get a <code>badmatch</code>) would simply return <code>[]</code> and <code>[1]</code>, respectively,
-so both succeed. (Note that EUnit is not psychic: if you write a test
-that returns a value, even if it is the wrong value, EUnit will consider
-it a success. You must make sure that the test is written so that it
-causes a crash if the result is not what it should be.)</p>
-
-<h5><a name="Using_assert_macros">Using assert macros</a></h5>
-
-If you want to use Boolean operators for your tests, the <code>assert</code>
-macro comes in handy (see <a href="#EUnit_macros">EUnit macros</a> for details):
-<pre> length_test() -&gt; ?assert(length([1,2,3]) =:= 3).</pre><p>
-The <code>?assert(Expression)</code> macro will evaluate <code>Expression</code>, and if that
-does not evaluate to <code>true</code>, it will throw an exception; otherwise it
-just returns <code>ok</code>. In the above example, the test will thus fail if the
-call to <code>length</code> does not return 3.</p>
-
-<h4><a name="Running_EUnit">Running EUnit</a></h4>
-
-<p>If you have added the declaration
-<code>-include_lib("eunit/include/eunit.hrl")</code> to your module, as described
-above, you only need to compile the module, and run the automatically
-exported function <code>test()</code>. For example, if your module was named <code>m</code>,
-then calling <code>m:test()</code> will run EUnit on all the tests defined in the
-module. You do not need to write <code>-export</code> declarations for the test
-functions. This is all done by magic.</p>
-
-<p>You can also use the function <a href="eunit.html#test-1"><code>eunit:test/1</code></a> to run arbitrary
-tests, for example to try out some more advanced test descriptors (see
-<a href="#EUnit_test_representation">EUnit test representation</a>). For example, running
-<code>eunit:test(m)</code> does the same thing as the auto-generated function
-<code>m:test()</code>, while <code>eunit:test({inparallel, m})</code> runs the same test
-cases but executes them all in parallel.</p>
-
-<h5><a name="Putting_tests_in_separate_modules">Putting tests in separate modules</a></h5>
-
-<p>If you want to separate your test code from your normal code (at least
-for testing the exported functions), you can simply write the test
-functions in a module named <code>m_tests</code> (note: not <code>m_test</code>), if your
-module is named <code>m</code>. Then, whenever you ask EUnit to test the module
-<code>m</code>, it will also look for the module <code>m_tests</code> and run those tests as
-well. See <code>ModuleName</code> in the section <a href="#Primitives">Primitives</a> for details.</p>
-
-<h5><a name="EUnit_captures_standard_output">EUnit captures standard output</a></h5>
-
-<p>If your test code writes to the standard output, you may be surprised to
-see that the text does not appear on the console when the tests are
-running. This is because EUnit captures all standard output from test
-functions (this also includes setup and cleanup functions, but not
-generator functions), so that it can be included in the test report if
-errors occur. To bypass EUnit and print text directly to the console
-while testing, you can write to the <code>user</code> output stream, as in
-<code>io:format(user, "~w", [Term])</code>. The recommended way of doing this is to
-use the EUnit <a href="#Debugging_macros">Debugging macros</a>, which make it much simpler.</p>
-
-<h4><a name="Writing_test_generating_functions">Writing test generating functions</a></h4>
-
-<p>A drawback of simple test functions is that you must write a separate
-function (with a separate name) for each test case. A more compact way
-of writing tests (and much more flexible, as we shall see), is to write
-functions that <em>return</em> tests, instead of <em>being</em> tests.</p>
-
-<p>A function with a name ending in <code>..._test_()</code> (note the final
-underscore) is recognized by EUnit as a <em>test generator</em>
-function. Test generators return a <em>representation</em> of a <em>set
-of tests</em> to be executed by EUnit.</p>
-
-<h5><a name="Representing_a_test_as_data">Representing a test as data</a></h5>
-
-The most basic representation of a test is a single fun-expression that
-takes no arguments. For example, the following test generator:
-<pre> basic_test_() -&gt;
- fun () -&gt; ?assert(1 + 1 =:= 2) end.</pre>
-will have the same effect as the following simple test:
-<pre> simple_test() -&gt;
- ?assert(1 + 1 =:= 2).</pre><p>
-(in fact, EUnit will handle all simple tests just like it handles
-fun-expressions: it will put them in a list, and run them one by one).</p>
-
-<h5><a name="Using_macros_to_write_tests">Using macros to write tests</a></h5>
-
-To make tests more compact and readable, as well as automatically add
-information about the line number in the source code where a test
-occurred (and reduce the number of characters you have to type), you can
-use the <code>_test</code> macro (note the initial underscore character), like
-this:
-<pre> basic_test_() -&gt;
- ?_test(?assert(1 + 1 =:= 2)).</pre><p>
-The <code>_test</code> macro takes any expression (the "body") as argument, and
-places it within a fun-expression (along with some extra information).
-The body can be any kind of test expression, just like the body of a
-simple test function.</p>
-
-<h5><a name="Underscore-prefixed_macros_create_test_objects">Underscore-prefixed macros create test objects</a></h5>
-
-But this example can be made even shorter! Most test macros, such as the
-family of <code>assert</code> macros, have a corresponding form with an initial
-underscore character, which automatically adds a <code>?_test(...)</code> wrapper.
-The above example can then simply be written:
-<pre> basic_test_() -&gt;
- ?_assert(1 + 1 =:= 2).</pre><p>
-which has exactly the same meaning (note the <code>_assert</code> instead of
-<code>assert</code>). You can think of the initial underscore as signalling
-<em>test object</em>.</p>
-
-<h4><a name="An_example">An example</a></h4>
-
-Sometimes, an example says more than a thousand words. The following
-small Erlang module shows how EUnit can be used in practice.
-<pre> -module(fib).
- -export([fib/1]).
- -include_lib("eunit/include/eunit.hrl").
-
- fib(0) -&gt; 1;
- fib(1) -&gt; 1;
- fib(N) when N &gt; 1 -&gt; fib(N-1) + fib(N-2).
-
- fib_test_() -&gt;
- [?_assert(fib(0) =:= 1),
- ?_assert(fib(1) =:= 1),
- ?_assert(fib(2) =:= 2),
- ?_assert(fib(3) =:= 3),
- ?_assert(fib(4) =:= 5),
- ?_assert(fib(5) =:= 8),
- ?_assertException(error, function_clause, fib(-1)),
- ?_assert(fib(31) =:= 2178309)
- ].</pre>
-
-<p>(Author's note: When I first wrote this example, I happened to write a
-<code>*</code> instead of <code>+</code> in the <code>fib</code> function. Of course, this showed up
-immediately when I ran the tests.)</p>
-
-<p>See <a href="#EUnit_test_representation">EUnit test representation</a> for a full list of all the ways
-you can specify test sets in EUnit.</p>
-
-<h4><a name="Disabling_testing">Disabling testing</a></h4>
-
-Testing can be turned off by defining the <code>NOTEST</code> macro when compiling,
-for example as an option to <code>erlc</code>, as in:
-<pre> erlc -DNOTEST my_module.erl</pre>
-or by adding a macro definition to the code, <em>before the EUnit header
-file is included</em>:
-<pre> -define(NOTEST, 1).</pre><p>
-(the value is not important, but should typically be 1 or <code>true</code>).
-Note that unless the <code>EUNIT_NOAUTO</code> macro is defined, disabling testing
-will also automatically strip all test functions from the code, except
-for any that are explicitly declared as exported.</p>
-
-For instance, to use EUnit in your application, but with testing turned
-off by default, put the following lines in a header file:
-<pre> -define(NOTEST, true).
- -include_lib("eunit/include/eunit.hrl").</pre>
-and then make sure that every module of your application includes that
-header file. This means that you have a only a single place to modify in
-order to change the default setting for testing. To override the <code>NOTEST</code>
-setting without modifying the code, you can define <code>TEST</code> in a compiler
-option, like this:
-<pre> erlc -DTEST my_module.erl</pre>
-
-<p>See <a href="#Compilation_control_macros">Compilation control macros</a> for details about these
-macros.</p>
-
-<h4><a name="Avoiding_compile-time_dependency_on_EUnit">Avoiding compile-time dependency on EUnit</a></h4>
-
-If you are distributing the source code for your application for other
-people to compile and run, you probably want to ensure that the code
-compiles even if EUnit is not available. Like the example in the
-previous section, you can put the following lines in a common header
-file:
-<pre> -ifdef(TEST).
- -include_lib("eunit/include/eunit.hrl").
- -endif.</pre><p>
-and, of course, also make sure that you place all test code that uses
-EUnit macros within <code>-ifdef(TEST)</code> or <code>-ifdef(EUNIT)</code> sections.</p>
-
-
-<h3><a name="EUnit_macros">EUnit macros</a></h3>
-
-<p>Although all the functionality of EUnit is avaliable even without the
-use of preprocessor macros, the EUnit header file defines a number of
-such macros in order to make it as easy as possible to write unit tests
-as compactly as possible and without getting too many details in the
-way.</p>
-
-<p>Except where explicitly stated, using EUnit macros will never introduce
-run-time dependencies on the EUnit library code, regardless of whether
-your code is compiled with testing enabled or disabled.</p>
-
-<ul>
-<li><a href="#Basic_macros">Basic macros</a></li>
-<li><a href="#Compilation_control_macros">Compilation control macros</a></li>
-<li><a href="#Utility_macros">Utility macros</a></li>
-<li><a href="#Assert_macros">Assert macros</a></li>
-<li><a href="#Macros_for_running_external_commands">Macros for running external commands</a></li>
-<li><a href="#Debugging_macros">Debugging macros</a></li>
-</ul>
-
-<h4><a name="Basic_macros">Basic macros</a></h4>
-
-<dl>
-<dt><code>_test(Expr)</code></dt>
-<dd>Turns <code>Expr</code> into a "test object", by wrapping it in a
-fun-expression and a source line number. Technically, this is the same
-as <code>{?LINE, fun () -&gt; (Expr) end}</code>.
-</dd>
-</dl>
-
-<h4><a name="Compilation_control_macros">Compilation control macros</a></h4>
-
-<dl>
-<dt><code>EUNIT</code></dt>
-<dd>This macro is always defined to <code>true</code> whenever EUnit is enabled at
-compile time. This is typically used to place testing code within
-conditional compilation, as in:
-<pre> -ifdef(EUNIT).
- % test code here
- ...
- -endif.</pre>
-e.g., to ensure that the code can be compiled without including the
-EUnit header file, when testing is disabled. See also the macros <code>TEST</code>
-and <code>NOTEST</code>.
-</dd>
-
-<dt><code>EUNIT_NOAUTO</code></dt>
-<dd>If this macro is defined, the automatic exporting or stripping of
-test functions will be disabled.
-</dd>
-
-<dt><code>TEST</code></dt>
-<dd><p>This macro is always defined (to <code>true</code>, unless previously defined
-by the user to have another value) whenever EUnit is enabled at compile
-time. This can be used to place testing code within conditional
-compilation; see also the macros <code>NOTEST</code> and <code>EUNIT</code>.</p>
-
-<p>For testing code that is strictly dependent on EUnit, it may be
-preferable to use the <code>EUNIT</code> macro for this purpose, while for code
-that uses more generic testing conventions, using the <code>TEST</code> macro may
-be preferred.</p>
-
-The <code>TEST</code> macro can also be used to override the <code>NOTEST</code> macro. If
-<code>TEST</code> is defined <em>before</em> the EUnit header file is
-included (even if <code>NOTEST</code> is also defined), then the code will be
-compiled with EUnit enabled.
-</dd>
-
-<dt><code>NOTEST</code></dt>
-<dd><p>This macro is always defined (to <code>true</code>, unless previously defined
-by the user to have another value) whenever EUnit is <em>disabled</em>
-at compile time. (Compare the <code>TEST</code> macro.)</p>
-
-This macro can also be used for conditional compilation, but is more
-typically used to disable testing: If <code>NOTEST</code> is defined
-<em>before</em> the EUnit header file is included, and <code>TEST</code>
-is <em>not</em> defined, then the code will be compiled with EUnit
-disabled. See also <a href="#Disabling_testing">Disabling testing</a>.
-</dd>
-
-<dt><code>NOASSERT</code></dt>
-<dd>If this macro is defined, the assert macros will have no effect,
-when testing is also disabled. See <a href="#Assert_macros">Assert macros</a>. When
-testing is enabled, the assert macros are always enabled automatically
-and cannot be disabled.
-</dd>
-
-<dt><code>ASSERT</code></dt>
-<dd>If this macro is defined, it overrides the NOASSERT macro, forcing
-the assert macros to always be enabled regardless of other settings.
-</dd>
-
-<dt><code>NODEBUG</code></dt>
-<dd>If this macro is defined, the debugging macros will have no effect.
-See <a href="#Debugging_macros">Debugging macros</a>. <code>NODEBUG</code> also implies <code>NOASSERT</code>,
-unless testing is enabled.
-</dd>
-
-<dt><code>DEBUG</code></dt>
-<dd>If this macro is defined, it overrides the NODEBUG macro, forcing
-the debugging macros to be enabled.
-</dd>
-</dl>
-
-<h4><a name="Utility_macros">Utility macros</a></h4>
-
-<p>The following macros can make tests more compact and readable:</p>
-
-<dl>
-<dt><code>LET(Var,Arg,Expr)</code></dt>
-<dd>Creates a local binding <code>Var = Arg</code> in <code>Expr</code>. (This is the same as
-<code>(fun(Var)-&gt;(Expr)end)(Arg)</code>.) Note that the binding is not exported
-outside of <code>Expr</code>, and that within <code>Expr</code>, this binding of <code>Var</code> will
-shadow any binding of <code>Var</code> in the surrounding scope.
-</dd>
-<dt><code>IF(Cond,TrueCase,FalseCase)</code></dt>
-<dd>Evaluates <code>TrueCase</code> if <code>Cond</code> evaluates to <code>true</code>, or otherwise
-evaluates <code>FalseCase</code> if <code>Cond</code> evaluates to <code>false</code>. (This is the same
-as <code>(case (Cond) of true-&gt;(TrueCase); false-&gt;(FalseCase) end)</code>.) Note
-that it is an error if <code>Cond</code> does not yield a boolean value.
-</dd>
-</dl>
-
-<h4><a name="Assert_macros">Assert macros</a></h4>
-
-<p>(Note that these macros also have corresponding forms which start with
-an "<code>_</code>" (underscore) character, as in <code>?_assert(BoolExpr)</code>, that create
-a "test object" instead of performing the test immediately. This is
-equivalent to writing <code>?_test(assert(BoolExpr))</code>, etc.)</p>
-
-<p>If the macro <code>NOASSERT</code> is defined before the EUnit header file is
-included, these macros have no effect when testing is also disabled; see
-<a href="#Compilation_control_macros">Compilation control macros</a> for details.</p>
-
-<dl>
-<dt><code>assert(BoolExpr)</code></dt>
-<dd><p>Evaluates the expression <code>BoolExpr</code>, if testing is enabled. Unless
-the result is <code>true</code>, an informative exception will be generated. If
-there is no exception, the result of the macro expression is the atom
-<code>ok</code>, and the value of <code>BoolExpr</code> is discarded. If testing is disabled,
-the macro will not generate any code except the atom <code>ok</code>, and
-<code>BoolExpr</code> will not be evaluated.</p>
-
-Typical usage:
-<pre> ?assert(f(X, Y) =:= [])</pre>
-
-The <code>assert</code> macro can be used anywhere in a program, not just in unit
-tests, to check pre/postconditions and invariants. For example:
-<pre> some_recursive_function(X, Y, Z) -&gt;
- ?assert(X + Y &gt; Z),
- ...</pre>
-</dd>
-<dt><code>assertNot(BoolExpr)</code></dt>
-<dd>Equivalent to <code>assert(not (BoolExpr))</code>.
-</dd>
-<dt><code>assertMatch(GuardedPattern, Expr)</code></dt>
-<dd><p>Evaluates <code>Expr</code> and matches the result against <code>GuardedPattern</code>, if
-testing is enabled. If the match fails, an informative exception will be
-generated; see the <code>assert</code> macro for further details. <code>GuardedPattern</code>
-can be anything that you can write on the left hand side of the <code>-&gt;</code>
-symbol in a case-clause, except that it cannot contain comma-separated
-guard tests.</p>
-
-<p>The main reason for using <code>assertMatch</code> also for simple matches, instead
-of matching with <code>=</code>, is that it produces more detailed error messages.</p>
-
-Examples:
-<pre> ?assertMatch({found, {fred, _}}, lookup(bloggs, Table))</pre>
-<pre> ?assertMatch([X|_] when X &gt; 0, binary_to_list(B))</pre>
-</dd>
-<dt><code>assertEqual(Expect, Expr)</code></dt>
-<dd><p>Evaluates the expressions <code>Expect</code> and <code>Expr</code> and compares the
-results for equality, if testing is enabled. If the values are not
-equal, an informative exception will be generated; see the <code>assert</code>
-macro for further details.</p>
-
-<p><code>assertEqual</code> is more suitable than than <code>assertMatch</code> when the
-left-hand side is a computed value rather than a simple pattern, and
-gives more details than <code>?assert(Expect =:= Expr)</code>.</p>
-
-Examples:
-<pre> ?assertEqual("b" ++ "a", lists:reverse("ab"))</pre>
-<pre> ?assertEqual(foo(X), bar(Y))</pre>
-</dd>
-<dt><code>assertException(ClassPattern, TermPattern, Expr)</code></dt>
-<dt><code>assertError(TermPattern, Expr)</code></dt>
-<dt><code>assertExit(TermPattern, Expr)</code></dt>
-<dt><code>assertThrow(TermPattern, Expr)</code></dt>
-<dd><p>Evaluates <code>Expr</code>, catching any exception and testing that it matches
-the expected <code>ClassPattern:TermPattern</code>. If the match fails, or if no
-exception is thrown by <code>Expr</code>, an informative exception will be
-generated; see the <code>assert</code> macro for further details. The
-<code>assertError</code>, <code>assertExit</code>, and <code>assertThrow</code> macros, are equivalent to
-using <code>assertException</code> with a <code>ClassPattern</code> of <code>error</code>, <code>exit</code>, or
-<code>throw</code>, respectively.</p>
-
-Examples:
-<pre> ?assertError(badarith, X/0)</pre>
-<pre> ?assertExit(normal, exit(normal))</pre>
-<pre> ?assertException(throw, {not_found,_}, throw({not_found,42}))</pre>
-</dd>
-</dl>
-
-<h4><a name="Macros_for_running_external_commands">Macros for running external commands</a></h4>
-
-<p>Keep in mind that external commands are highly dependent on the
-operating system. You can use the standard library function <code>os:type()</code>
-in test generator functions, to produce different sets of tests
-depending on the current operating system.</p>
-
-<p>Note: these macros introduce a run-time dependency on the EUnit library
-code, if compiled with testing enabled.</p>
-
-<dl>
-<dt><code>assertCmd(CommandString)</code></dt>
-<dd><p>Runs <code>CommandString</code> as an external command, if testing is enabled.
-Unless the returned status value is 0, an informative exception will be
-generated. If there is no exception, the result of the macro expression
-is the atom <code>ok</code>. If testing is disabled, the macro will not generate
-any code except the atom <code>ok</code>, and the command will not be executed.</p>
-
-Typical usage:
-<pre> ?assertCmd("mkdir foo")</pre>
-</dd>
-<dt><code>assertCmdStatus(N, CommandString)</code></dt>
-<dd>Like the <code>assertCmd(CommandString)</code> macro, but generates an
-exception unless the returned status value is <code>N</code>.
-</dd>
-<dt><code>assertCmdOutput(Text, CommandString)</code></dt>
-<dd>Runs <code>CommandString</code> as an external command, if testing is enabled.
-Unless the output produced by the command exactly matches the specified
-string <code>Text</code>, an informative exception will be generated. (Note that
-the output is normalized to use a single LF character as line break on
-all platforms.) If there is no exception, the result of the macro
-expression is the atom <code>ok</code>. If testing is disabled, the macro will not
-generate any code except the atom <code>ok</code>, and the command will not be
-executed.
-</dd>
-<dt><code>cmd(CommandString)</code></dt>
-<dd><p>Runs <code>CommandString</code> as an external command. Unless the returned
-status value is 0 (indicating success), an informative exception will be
-generated; otherwise, the result of the macro expression is the output
-produced by the command, as a flat string. The output is normalized to
-use a single LF character as line break on all platforms.</p>
-
-<p>This macro is useful in the setup and cleanup sections of fixtures,
-e.g., for creating and deleting files or perform similar operating
-system specific tasks, to make sure that the test system is informed of
-any failures.</p>
-
-A Unix-specific example:
-<pre> {setup,
- fun () -&gt; ?cmd("mktemp") end,
- fun (FileName) -&gt; ?cmd("rm " ++ FileName) end,
- ...}</pre>
-</dd>
-</dl>
-
-<h4><a name="Debugging_macros">Debugging macros</a></h4>
-
-<p>To help with debugging, EUnit defines several useful macros for printing
-messages directly to the console (rather than to the standard output).
-Furthermore, these macros all use the same basic format, which includes
-the file and line number where they occur, making it possible in some
-development environments (e.g., when running Erlang in an Emacs buffer)
-to simply click on the message and jump directly to the corresponding
-line in the code.</p>
-
-<p>If the macro <code>NODEBUG</code> is defined before the EUnit header file is
-included, these macros have no effect; see
-<a href="#Compilation_control_macros">Compilation control macros</a> for details.</p>
-
-<dl>
-<dt><code>debugHere</code></dt>
-<dd>Just prints a marker showing the current file and line number. Note
-that this is an argument-less macro. The result is always <code>ok</code>.</dd>
-<dt><code>debugMsg(Text)</code></dt>
-<dd>Outputs the message <code>Text</code> (which can be a plain string, an IO-list,
-or just an atom). The result is always <code>ok</code>.</dd>
-<dt><code>debugFmt(FmtString, Args)</code></dt>
-<dd>This formats the text like <code>io:format(FmtString, Args)</code> and outputs
-it like <code>debugMsg</code>. The result is always <code>ok</code>.</dd>
-<dt><code>debugVal(Expr)</code></dt>
-<dd>Prints both the source code for <code>Expr</code> and its current value. E.g.,
-<code>?debugVal(f(X))</code> might be displayed as "<code>f(X) = 42</code>". (Large terms are
-shown truncated.) The result is always the value of <code>Expr</code>, so this
-macro can be wrapped around any expression to display its value when
-the code is compiled with debugging enabled.</dd>
-<dt><code>debugTime(Text,Expr)</code></dt>
-<dd>Prints <code>Text</code> and the wall clock time for evaluation of <code>Expr</code>. The
-result is always the value of <code>Expr</code>, so this macro can be wrapped
-around any expression to show its run time when the code is compiled
-with debugging enabled. For example, <code>List1 = ?debugTime("sorting",
-lists:sort(List))</code> might show as "<code>sorting: 0.015 s</code>".</dd>
-
-</dl>
-
-
-<h3><a name="EUnit_test_representation">EUnit test representation</a></h3>
-
-<p>The way EUnit represents tests and test sets as data is flexible,
-powerful, and concise. This section describes the representation in
-detail.</p>
-
-<ul>
-<li><a href="#Simple_test_objects">Simple test objects</a></li>
-<li><a href="#Test_sets_and_deep_lists">Test sets and deep lists</a></li>
-<li><a href="#Titles">Titles</a></li>
-<li><a href="#Primitives">Primitives</a></li>
-<li><a href="#Control">Control</a></li>
-<li><a href="#Fixtures">Fixtures</a></li>
-<li><a href="#Lazy_generators">Lazy generators</a></li>
-</ul>
-
-<h4><a name="Simple_test_objects">Simple test objects</a></h4>
-
-A <em>simple test object</em> is one of the following:
-<ul>
- <li>A nullary functional value (i.e., a fun that takes zero
- arguments). Examples:
-<pre> fun () -&gt; ... end</pre>
-<pre> fun some_function/0</pre>
-<pre> fun some_module:some_function/0</pre>
- </li>
- <li>A pair of atoms <code>{ModuleName, FunctionName}</code>, referring to the
- function <code>ModuleName:FunctionName/0</code></li>
- <li>A pair <code>{LineNumber, SimpleTest}</code>, where <code>LineNumber</code> is a
- nonnegative integer and <code>SimpleTest</code> is another simple test
- object. <code>LineNumber</code> should indicate the source line of the test.
- Pairs like this are usually only created via <code>?_test(...)</code> macros;
- see <a href="#Basic_macros">Basic macros</a>.</li>
-</ul><p>
-In brief, a simple test object consists of a single function that takes
-no arguments (possibly annotated with some additional metadata, i.e., a
-line number). Evaluation of the function either <em>succeeds</em>, by
-returning some value (which is ignored), or <em>fails</em>, by throwing
-an exception.</p>
-
-<h4><a name="Test_sets_and_deep_lists">Test sets and deep lists</a></h4>
-
-<p>A test set can be easily created by placing a sequence of test objects
-in a list. If <code>T_1</code>, ..., <code>T_N</code> are individual test objects, then <code>[T_1,
-..., T_N]</code> is a test set consisting of those objects (in that order).</p>
-
-<p>Test sets can be joined in the same way: if <code>S_1</code>, ..., <code>S_K</code> are test
-sets, then <code>[S_1, ..., S_K]</code> is also a test set, where the tests of
-<code>S_i</code> are ordered before those of <code>S_(i+1)</code>, for each subset <code>S_i</code>.</p>
-
-<p>Thus, the main representation of test sets is <em>deep lists</em>, and
-a simple test object can be viewed as a test set containing only a
-single test; there is no difference between <code>T</code> and <code>[T]</code>.</p>
-
-<p>A module can also be used to represent a test set; see <code>ModuleName</code>
-under <a href="#Primitives">Primitives</a> below.</p>
-
-<h4><a name="Titles">Titles</a></h4>
-
-<p>Any test or test set <code>T</code> can be annotated with a title, by wrapping it
-in a pair <code>{Title, T}</code>, where <code>Title</code> is a string. For convenience, any
-test which is normally represented using a tuple can simply be given a
-title string as the first element, i.e., writing <code>{"The Title", ...}</code>
-instead of adding an extra tuple wrapper as in <code>{"The Title", {...}}</code>.</p>
-
-
-<h4><a name="Primitives">Primitives</a></h4>
-
-The following are primitives, which do not contain other test sets as
-arguments:
-<dl>
-<dt><code>ModuleName::atom()</code>
-</dt>
-<dd>A single atom represents a module name, and is equivalent to
-<code>{module, ModuleName}</code>. This is often used as in the call
-<code>eunit:test(some_module)</code>.
-</dd>
-<dt><code>{module, ModuleName::atom()}</code>
-</dt>
-<dd><p>This composes a test set from the exported test functions of the
-named module, i.e., those functions with arity zero whose names end
-with <code>_test</code> or <code>_test_</code>. Basically, the <code>..._test()</code> functions become
-simple tests, while the <code>..._test_()</code> functions become generators.</p>
-
-In addition, EUnit will also look for another module whose name is
-<code>ModuleName</code> plus the suffix <code>_tests</code>, and if it exists, all the tests
-from that module will also be added. (If <code>ModuleName</code> already contains
-the suffix <code>_tests</code>, this is not done.) E.g., the specification
-<code>{module, mymodule}</code> will run all tests in the modules <code>mymodule</code> and
-<code>mymodule_tests</code>. Typically, the <code>_tests</code> module should only contain
-test cases that use the public interface of the main module (and no
-other code).
-</dd>
-<dt><code>{application, AppName::atom(), Info::list()}</code>
-</dt>
-<dd>This is a normal Erlang/OTP application descriptor, as found in an
- <code>.app</code> file. The resulting test set consists of the modules listed in
- the <code>modules</code> entry in <code>Info</code>.
-</dd>
-<dt><code>{application, AppName::atom()}</code>
-</dt>
-<dd>This creates a test set from all the modules belonging to the
-specified application, by consulting the application's <code>.app</code> file
-(see <code>{file, FileName}</code>), or if no such file exists, by testing all
-object files in the application's <tt>ebin</tt>-directory (see <code>{dir,
-Path}</code>); if that does not exist, the <code>code:lib_dir(AppName)</code> directory
-is used.
-</dd>
-<dt><code>Path::string()</code>
-</dt>
-<dd>A single string represents the path of a file or directory, and is
-equivalent to <code>{file, Path}</code>, or <code>{dir, Path}</code>, respectively, depending
-on what <code>Path</code> refers to in the file system.
-</dd>
-<dt><code>{file, FileName::string()}</code>
-</dt>
-<dd><p>If <code>FileName</code> has a suffix that indicates an object file (<code>.beam</code>),
-EUnit will try to reload the module from the specified file and test it.
-Otherwise, the file is assumed to be a text file containing test
-specifications, which will be read using the standard library function
-<code>file:path_consult/2</code>.</p>
-
-Unless the file name is absolute, the file is first searched for
-relative to the current directory, and then using the normal search path
-(<code>code:get_path()</code>). This means that the names of typical "app" files
-can be used directly, without a path, e.g., <code>"mnesia.app"</code>.
-</dd>
-<dt><code>{dir, Path::string()}</code>
-</dt>
-<dd>This tests all object files in the specified directory, as if they
-had been individually specified using <code>{file, FileName}</code>.
-</dd>
-<dt><code>{generator, GenFun::(() -&gt; Tests)}</code>
-</dt>
-<dd>The generator function <code>GenFun</code> is called to produce a test
-set.
-</dd>
-<dt><code>{generator, ModuleName::atom(), FunctionName::atom()}</code>
-</dt>
-<dd>The function <code>ModuleName:FunctionName()</code> is called to produce a test
-set.
-</dd>
-<dt><code>{with, X::any(), [AbstractTestFun::((any()) -&gt; any())]}</code>
-</dt>
-<dd>Distributes the value <code>X</code> over the unary functions in the list,
-turning them into nullary test functions. An <code>AbstractTestFun</code> is like
-an ordinary test fun, but takes one argument instead of zero - it's
-basically missing some information before it can be a proper test. In
-practice, <code>{with, X, [F_1, ..., F_N]}</code> is equivalent to <code>[fun () -&gt;
-F_1(X) end, ..., fun () -&gt; F_N(X) end]</code>. This is particularly useful if
-your abstract test functions are already implemented as proper
-functions: <code>{with, FD, [fun filetest_a/1, fun filetest_b/1, fun
-filetest_c/1]}</code> is equivalent to <code>[fun () -&gt; filetest_a(FD) end, fun ()
--&gt; filetest_b(FD) end, fun () -&gt; filetest_c(FD) end]</code>, but much more
-compact. See also <a href="#Fixtures">Fixtures</a>, below.
-</dd>
-</dl>
-
-<h4><a name="Control">Control</a></h4>
-
-The following representations control how and where tests are executed:
-<dl>
-<dt><code>{spawn, Tests}</code></dt>
-<dd>Runs the specified tests in a separate subprocess, while the current
-test process waits for it to finish. This is useful for tests that need
-a fresh, isolated process state. (Note that EUnit always starts at least
-one such a subprocess automatically; tests are never executed by the
-caller's own process.)</dd>
-<dt><code>{spawn, Node::atom(), Tests}</code></dt>
-<dd>Like <code>{spawn, Tests}</code>, but runs the specified tests on the given
-Erlang node.</dd>
-<dt><code>{timeout, Time::number(), Tests}</code></dt>
-<dd>Runs the specified tests under the given timeout. Time is in
-seconds; e.g., 60 means one minute and 0.1 means 1/10th of a second. If
-the timeout is exceeded, the unfinished tests will be forced to
-terminate. Note that if a timeout is set around a fixture, it includes
-the time for setup and cleanup, and if the timeout is triggered, the
-entire fixture is abruptly terminated (without running the
-cleanup).</dd>
-<dt><code>{inorder, Tests}</code></dt>
-<dd>Runs the specified tests in strict order. Also see <code>{inparallel,
-Tests}</code>. By default, tests are neither marked as <code>inorder</code> or
-<code>inparallel</code>, but may be executed as the test framework chooses.</dd>
-<dt><code>{inparallel, Tests}</code></dt>
-<dd>Runs the specified tests in parallel (if possible). Also see
-<code>{inorder, Tests}</code>.</dd>
-<dt><code>{inparallel, N::integer(), Tests}</code></dt>
-<dd>Like <code>{inparallel, Tests}</code>, but running no more than <code>N</code> subtests
-simultaneously.</dd>
-</dl>
-
-<h4><a name="Fixtures">Fixtures</a></h4>
-
-<p>A "fixture" is some state that is necessary for a particular set of
-tests to run. EUnit's support for fixtures makes it easy to set up such
-state locally for a test set, and automatically tear it down again when
-the test set is finished, regardless of the outcome (success, failures,
-timeouts, etc.).</p>
-
-<p>To make the descriptions simpler, we first list some definitions:
-<center>
-<table border="0" cellspacing="4">
-<tr>
-<td><code>Setup</code></td><td><code>() -&gt; (R::any())</code></td>
-</tr>
-<tr>
-<td><code>SetupX</code></td><td><code>(X::any()) -&gt; (R::any())</code></td>
-</tr>
-<tr>
-<td><code>Cleanup</code></td><td><code>(R::any()) -&gt; any()</code></td>
-</tr>
-<tr>
-<td><code>CleanupX</code></td><td><code>(X::any(), R::any()) -&gt; any()</code></td>
-</tr>
-<tr>
-<td><code>Instantiator</code></td><td><code>((R::any()) -&gt; Tests) | {with, [AbstractTestFun::((any()) -&gt; any())]}</code></td>
-</tr>
-<tr>
-<td><code>Where</code></td><td><code>local | spawn | {spawn, Node::atom()}</code></td>
-</tr>
-</table>
-</center>
-(these are explained in more detail further below.)</p>
-
-The following representations specify fixture handling for test sets:
-<dl>
-<dt><code>{setup, Setup, Tests | Instantiator}</code></dt>
-<dt><code>{setup, Setup, Cleanup, Tests | Instantiator}</code></dt>
-<dt><code>{setup, Where, Setup, Tests | Instantiator}</code></dt>
-<dt><code>{setup, Where, Setup, Cleanup, Tests | Instantiator}</code></dt>
-<dd><code>setup</code> sets up a single fixture for running all of the specified
-tests, with optional teardown afterwards. The arguments are described in
-detail below.
-</dd>
-<dt><code>{node, Node::atom(), Tests | Instantiator}</code></dt>
-<dt><code>{node, Node::atom(), Args::string(), Tests | Instantiator}</code></dt>
-<dd><code>node</code> is like <code>setup</code>, but with a built-in behaviour: it starts a
-slave node for the duration of the tests. The atom <code>Node</code> should have
-the format <code>[email protected]</code>, and <code>Args</code> are the optional
-arguments to the new node; see <code>slave:start_link/3</code> for details.
-</dd>
-<dt><code>{foreach, Where, Setup, Cleanup, [Tests | Instantiator]}</code></dt>
-<dt><code>{foreach, Setup, Cleanup, [Tests | Instantiator]}</code></dt>
-<dt><code>{foreach, Where, Setup, [Tests | Instantiator]}</code></dt>
-<dt><code>{foreach, Setup, [Tests | Instantiator]}</code></dt>
-<dd><code>foreach</code> is used to set up a fixture and optionally tear it down
-afterwards, repeated for each single one of the specified test sets.
-</dd>
-<dt><code>{foreachx, Where, SetupX, CleanupX,
- Pairs::[{X::any(), ((X::any(), R::any()) -&gt; Tests)}]}</code></dt>
-<dt><code>{foreachx, SetupX, CleanupX, Pairs}</code></dt>
-<dt><code>{foreachx, Where, SetupX, Pairs}</code></dt>
-<dt><code>{foreachx, SetupX, Pairs}</code></dt>
-<dd><code>foreachx</code> is like <code>foreach</code>, but uses a list of pairs, each
-containing an extra argument <code>X</code> and an extended instantiator function.
-</dd>
-</dl>
-
-<p>A <code>Setup</code> function is executed just before any of the specified tests
-are run, and a <code>Cleanup</code> function is executed when no more of the
-specified tests will be run, regardless of the reason. A <code>Setup</code>
-function takes no argument, and returns some value which will be passed
-as it is to the <code>Cleanup</code> function. A <code>Cleanup</code> function should do
-whatever necessary and return some arbitrary value, such as the atom
-<code>ok</code>. (<code>SetupX</code> and <code>CleanupX</code> functions are similar, but receive one
-additional argument: some value <code>X</code>, which depends on the context.) When
-no <code>Cleanup</code> function is specified, a dummy function is used which has
-no effect.</p>
-
-<p>An <code>Instantiator</code> function receives the same value as the <code>Cleanup</code>
-function, i.e., the value returned by the <code>Setup</code> function. It should
-then behave much like a generator (see <a href="#Primitives">Primitives</a>), and
-return a test set whose tests have been <em>instantiated</em> with the
-given value. A special case is the syntax <code>{with, [AbstractTestFun]}</code>
-which represents an instantiator function that distributes the value
-over a list of unary functions; see <a href="#Primitives">Primitives</a>: <code>{with, X,
-[...]}</code> for more details.</p>
-
-A <code>Where</code> term controls how the specified tests are executed. The
-default is <code>spawn</code>, which means that the current process handles the
-setup and teardown, while the tests are executed in a subprocess.
-<code>{spawn, Node}</code> is like <code>spawn</code>, but runs the subprocess on the
-specified node. <code>local</code> means that the current process will handle both
-setup/teardown and running the tests - the drawback is that if a test
-times out so that the process is killed, the <em>cleanup will not be
-performed</em>; hence, avoid this for persistent fixtures such as file
-operations. In general, 'local' should only be used when:
-<ul>
- <li>the setup/teardown needs to be executed by the process that will
- run the tests;</li>
- <li>no further teardown needs to be done if the process is killed
- (i.e., no state outside the process was affected by the setup)</li>
-</ul>
-
-<h4><a name="Lazy_generators">Lazy generators</a></h4>
-
-<p>Sometimes, it can be convenient not to produce the whole set of test
-descriptions before the testing begins; for example, if you want to
-generate a huge amount of tests that would take up too much space to
-keep in memory all at once.</p>
-
-<p>It is fairly easy to write a generator which, each time it is called,
-either produces an empty list if it is done, or otherwise produces a
-list containing a single test case plus a new generator which will
-produce the rest of the tests. This demonstrates the basic pattern:</p>
-
-<pre> lazy_test_() -&gt;
- lazy_gen(10000).
-
- lazy_gen(N) -&gt;
- {generator,
- fun () -&gt;
- if N &gt; 0 -&gt;
- [?_test(...)
- | lazy_gen(N-1)];
- true -&gt;
- []
- end
- end}.</pre>
-
-<p>When EUnit traverses the test representation in order to run the tests,
-the new generator will not be called to produce the next test until the
-previous test has been executed.</p>
-
-Note that it is easiest to write this kind of recursive generator using
-a help function, like the <code>lazy_gen/1</code> function above. It can also be
-written using a recursive fun, if you prefer to not clutter your
-function namespace and are comfortable with writing that kind of code.
-
-<hr>
-<div class="navbar"><a name="#navbar_bottom"></a><table width="100%" border="0" cellspacing="0" cellpadding="2" summary="navigation bar"><tr><td><a href="overview-summary.html" target="overviewFrame">Overview</a></td><td><a href="http://www.erlang.org/"><img src="erlang.png" align="right" border="0" alt="erlang logo"></a></td></tr></table></div>
-<p><i>Generated by EDoc, Apr 22 2009, 22:37:19.</i></p>
-</body>
-</html>
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