%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2003-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
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%% http://www.apache.org/licenses/LICENSE-2.0
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%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% limitations under the License.
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%% %CopyrightEnd%
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% %%%
%%% WARNING %%%
%%% %%%
%%% This is experimental code which may be changed or removed %%%
%%% anytime without any warning. %%%
%%% %%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% @doc EXPERIMENTAL support in common-test for calling property based tests.
%%%
%%% <p>This module is a first step towards running Property Based testing in the
%%% Common Test framework. A property testing tool like QuickCheck or PropEr is
%%% assumed to be installed.</p>
%%%
%%% <p>The idea is to have a common_test testsuite calling a property testing
%%% tool with special property test suites as defined by that tool. In this manual
%%% we assume the usual Erlang Application directory structure. The tests are
%%% collected in the application's <c>test</c> directory. The test directory
%%% has a sub-directory called <c>property_test</c> where everything needed for
%%% the property tests are collected.</p>
%%%
%%% <p>A typical ct test suite using <c>ct_property_test</c> is organized as follows:
%%% </p>
%%% ```
%%% -include_lib("common_test/include/ct.hrl").
%%%
%%% all() -> [prop_ftp_case].
%%%
%%% init_per_suite(Config) ->
%%% ct_property_test:init_per_suite(Config).
%%%
%%% %%%---- test case
%%% prop_ftp_case(Config) ->
%%% ct_property_test:quickcheck(
%%% ftp_simple_client_server:prop_ftp(Config),
%%% Config
%%% ).
%%% '''
%%%
%%% <warning>
%%% <p>
%%% This is experimental code which may be changed or removed
%%% anytime without any warning.
%%% </p>
%%% </warning>
%%%
%%% @end
-module(ct_property_test).
%% API
-export([init_per_suite/1,
quickcheck/2]).
-include_lib("common_test/include/ct.hrl").
%%%-----------------------------------------------------------------
%%% @spec init_per_suite(Config) -> Config | {skip,Reason}
%%%
%%% @doc Initializes Config for property testing.
%%%
%%% <p>The function investigates if support is available for either Quickcheck, PropEr,
%%% or Triq.
%%% The options <c>{property_dir,AbsPath}</c> and
%%% <c>{property_test_tool,Tool}</c> is set in the Config returned.</p>
%%% <p>The function is intended to be called in the init_per_suite in the test suite.</p>
%%% <p>The property tests are assumed to be in the subdirectory <c>property_test</c>.</p>
%%% @end
init_per_suite(Config) ->
case which_module_exists([eqc,proper,triq]) of
{ok,ToolModule} ->
ct:pal("Found property tester ~p",[ToolModule]),
Path = property_tests_path("property_test", Config),
case compile_tests(Path,ToolModule) of
error ->
{fail, "Property test compilation failed in "++Path};
up_to_date ->
add_code_pathz(Path),
[{property_dir,Path},
{property_test_tool,ToolModule} | Config]
end;
not_found ->
ct:pal("No property tester found",[]),
{skip, "No property testing tool found"}
end.
%%%-----------------------------------------------------------------
%%% @spec quickcheck(Property, Config) -> true | {fail,Reason}
%%%
%%% @doc Call quickcheck and return the result in a form suitable for common_test.
%%%
%%% <p>The function is intended to be called in the test cases in the test suite.</p>
%%% @end
quickcheck(Property, Config) ->
Tool = proplists:get_value(property_test_tool,Config),
F = function_name(quickcheck, Tool),
mk_ct_return( Tool:F(Property), Tool ).
%%%================================================================
%%%
%%% Local functions
%%%
%%% Make return values back to the calling Common Test suite
mk_ct_return(true, _Tool) ->
true;
mk_ct_return(Other, Tool) ->
try lists:last(hd(Tool:counterexample()))
of
{set,{var,_},{call,M,F,Args}} ->
{fail, io_lib:format("~p:~tp/~p returned bad result",[M,F,length(Args)])}
catch
_:_ ->
{fail, Other}
end.
%%% Check if a property testing tool is found
which_module_exists([Module|Modules]) ->
case module_exists(Module) of
true -> {ok,Module};
false -> which_module_exists(Modules)
end;
which_module_exists(_) ->
not_found.
module_exists(Module) ->
is_list(catch Module:module_info()).
%%% The path to the property tests
property_tests_path(Dir, Config) ->
DataDir = proplists:get_value(data_dir, Config),
filename:join(lists:droplast(filename:split(DataDir))++[Dir]).
%%% Extend the code path with Dir if it not already present
add_code_pathz(Dir) ->
case lists:member(Dir, code:get_path()) of
true -> ok;
false ->
true = code:add_pathz(Dir),
ok
end.
compile_tests(Path, ToolModule) ->
MacroDefs = macro_def(ToolModule),
{ok,Cwd} = file:get_cwd(),
ok = file:set_cwd(Path),
{ok,FileNames} = file:list_dir("."),
BeamFiles = [F || F<-FileNames,
filename:extension(F) == ".beam"],
_ = [file:delete(F) || F<-BeamFiles],
ct:pal("Compiling in ~tp:~n Deleted ~p~n MacroDefs=~p",[Path,BeamFiles,MacroDefs]),
Result = make:all([load|MacroDefs]),
ok = file:set_cwd(Cwd),
Result.
macro_def(eqc) -> [{d, 'EQC'}];
macro_def(proper) -> [{d, 'PROPER'}];
macro_def(triq) -> [{d, 'TRIQ'}].
function_name(quickcheck, triq) -> check;
function_name(F, _) -> F.
