%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License as
%% published by the Free Software Foundation; either version 2 of the
%% License, or (at your option) any later version.
%%
%% This library is distributed in the hope that it will be useful, but
%% WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%% Lesser General Public License for more details.
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA
%%
%% $Id: eunit_test.erl 336 2009-03-06 14:43:21Z rcarlsson $
%%
%% @author Richard Carlsson <[email protected]>
%% @copyright 2006 Richard Carlsson
%% @private
%% @see eunit
%% @doc Test running functionality
-module(eunit_test).
-export([run_testfun/1, function_wrapper/2, enter_context/4,
multi_setup/1]).
-include("eunit.hrl").
-include("eunit_internal.hrl").
%% ---------------------------------------------------------------------
%% Getting a cleaned up stack trace. (We don't want it to include
%% eunit's own internal functions. This complicates self-testing
%% somewhat, but you can't have everything.) Note that we assume that
%% this particular module is the boundary between eunit and user code.
get_stacktrace() ->
get_stacktrace([]).
get_stacktrace(Ts) ->
eunit_lib:uniq(prune_trace(erlang:get_stacktrace(), Ts)).
prune_trace([{eunit_data, _, _} | Rest], Tail) ->
prune_trace(Rest, Tail);
prune_trace([{?MODULE, _, _} | _Rest], Tail) ->
Tail;
prune_trace([T | Ts], Tail) ->
[T | prune_trace(Ts, Tail)];
prune_trace([], Tail) ->
Tail.
%% ---------------------------------------------------------------------
%% Test runner
%% @spec ((any()) -> any()) -> {ok, Value} | {error, eunit_lib:exception()}
%% @throws wrapperError()
run_testfun(F) ->
try
F()
of Value ->
{ok, Value}
catch
{eunit_internal, Term} ->
%% Internally generated: re-throw Term (lose the trace)
throw(Term);
Class:Reason ->
{error, {Class, Reason, get_stacktrace()}}
end.
-ifdef(TEST).
macro_test_() ->
{"macro definitions",
[{?LINE, fun () ->
{?LINE, F} = ?_test(undefined),
{ok, undefined} = run_testfun(F)
end},
?_test(begin
{?LINE, F} = ?_assert(true),
{ok, ok} = run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assert(false),
{error,{error,{assertion_failed,
[{module,_},
{line,_},
{expression,_},
{expected,true},
{value,false}]},
_}}
= run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assert([]),
{error,{error,{assertion_failed,
[{module,_},
{line,_},
{expression,_},
{expected,true},
{value,{not_a_boolean,[]}}]},
_}}
= run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertNot(false),
{ok, ok} = run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertNot(true),
{error,{error,{assertion_failed,
[{module,_},
{line,_},
{expression,_},
{expected,true},
{value,false}]},
_}}
= run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertMatch(ok, ok),
{ok, ok} = run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertMatch([_], []),
{error,{error,{assertMatch_failed,
[{module,_},
{line,_},
{expression,_},
{expected,"[ _ ]"},
{value,[]}]},
_}}
= run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertEqual(ok, ok),
{ok, ok} = run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertEqual(3, 1+1),
{error,{error,{assertEqual_failed,
[{module,_},
{line,_},
{expression,_},
{expected,3},
{value,2}]},
_}}
= run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertException(error, badarith,
erlang:error(badarith)),
{ok, ok} = run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertException(error, badarith, ok),
{error,{error,{assertException_failed,
[{module,_},
{line,_},
{expression,_},
{expected,_},
{unexpected_success,ok}]},
_}}
= run_testfun(F)
end),
?_test(begin
{?LINE, F} = ?_assertException(error, badarg,
erlang:error(badarith)),
{error,{error,{assertException_failed,
[{module,_},
{line,_},
{expression,_},
{expected,_},
{unexpected_exception,
{error,badarith,_}}]},
_}}
= run_testfun(F)
end)
]}.
under_eunit_test() -> ?assert(?UNDER_EUNIT).
-endif.
%% ---------------------------------------------------------------------
%% Wrapper for simple "named function" tests ({M,F}), which provides
%% better error reporting when the function is missing at test time.
%%
%% Note that the wrapper fun is usually called by run_testfun/1, and the
%% special exceptions thrown here are expected to be handled there.
%%
%% @throws {eunit_internal, wrapperError()}
%%
%% @type wrapperError() = {no_such_function, mfa()}
%% | {module_not_found, moduleName()}
function_wrapper(M, F) ->
fun () ->
try M:F()
catch
error:undef ->
%% Check if it was M:F/0 that was undefined
case erlang:module_loaded(M) of
false ->
fail({module_not_found, M});
true ->
case erlang:function_exported(M, F, 0) of
false ->
fail({no_such_function, {M,F,0}});
true ->
rethrow(error, undef, [{M,F,0}])
end
end
end
end.
rethrow(Class, Reason, Trace) ->
erlang:raise(Class, Reason, get_stacktrace(Trace)).
fail(Term) ->
throw({eunit_internal, Term}).
-ifdef(TEST).
wrapper_test_() ->
{"error handling in function wrapper",
[?_assertException(throw, {module_not_found, eunit_nonexisting},
run_testfun(function_wrapper(eunit_nonexisting,test))),
?_assertException(throw,
{no_such_function, {?MODULE,nonexisting_test,0}},
run_testfun(function_wrapper(?MODULE,nonexisting_test))),
?_test({error, {error, undef, _T}}
= run_testfun(function_wrapper(?MODULE,wrapper_test_exported_)))
]}.
%% this must be exported (done automatically by the autoexport transform)
wrapper_test_exported_() ->
{ok, ?MODULE:nonexisting_function()}.
-endif.
%% ---------------------------------------------------------------------
%% Entering a setup-context, with guaranteed cleanup.
%% @spec (Setup, Cleanup, Instantiate, Callback) -> any()
%% Setup = () -> any()
%% Cleanup = (any()) -> any()
%% Instantiate = (any()) -> tests()
%% Callback = (tests()) -> any()
%% @throws {context_error, Error, eunit_lib:exception()}
%% Error = setup_failed | instantiation_failed | cleanup_failed
enter_context(Setup, Cleanup, Instantiate, Callback) ->
try Setup() of
R ->
try Instantiate(R) of
T ->
try Callback(T) %% call back to client code
after
%% Always run cleanup; client may be an idiot
try Cleanup(R)
catch
Class:Term ->
context_error(cleanup_failed, Class, Term)
end
end
catch
Class:Term ->
context_error(instantiation_failed, Class, Term)
end
catch
Class:Term ->
context_error(setup_failed, Class, Term)
end.
context_error(Type, Class, Term) ->
throw({context_error, Type, {Class, Term, get_stacktrace()}}).
%% This generates single setup/cleanup functions from a list of tuples
%% on the form {Tag, Setup, Cleanup}, where the setup function always
%% backs out correctly from partial completion.
multi_setup(List) ->
{SetupAll, CleanupAll} = multi_setup(List, fun ok/1),
%% must reverse back and forth here in order to present the list in
%% "natural" order to the test instantiation function
{fun () -> lists:reverse(SetupAll([])) end,
fun (Rs) -> CleanupAll(lists:reverse(Rs)) end}.
multi_setup([{Tag, S, C} | Es], CleanupPrev) ->
Cleanup = fun ([R | Rs]) ->
try C(R) of
_ -> CleanupPrev(Rs)
catch
Class:Term ->
throw({Tag, {Class, Term, get_stacktrace()}})
end
end,
{SetupRest, CleanupAll} = multi_setup(Es, Cleanup),
{fun (Rs) ->
try S() of
R ->
SetupRest([R|Rs])
catch
Class:Term ->
CleanupPrev(Rs),
throw({Tag, {Class, Term, get_stacktrace()}})
end
end,
CleanupAll};
multi_setup([{Tag, S} | Es], CleanupPrev) ->
multi_setup([{Tag, S, fun ok/1} | Es], CleanupPrev);
multi_setup([], CleanupAll) ->
{fun (Rs) -> Rs end, CleanupAll}.
ok(_) -> ok.
