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Fix incorrect coverage count when prod modules include EUnit header.

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Modules that include the EUnit header get an implicit test/0 fun,
which cover considers a runnable line, but eunit:(TestRepresentation)
never calls.  Result: prod modules with tests can never reach 100%
coverage.  Ironic.  In this case, fix it by decrementing the NotCovered
counter returned by cover:analyze/3.
This commit is contained in:
Chris Bernard 2010-05-15 15:09:45 -04:00
parent 35a928ecf2
commit 4825353a23
2 changed files with 53 additions and 3 deletions
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32
src/rebar_eunit.erl
View file

@ -238,13 +238,43 @@ cover_init(Config, BeamFiles) ->
cover_analyze_mod(Module) ->
case cover:analyze(Module, coverage, module) of
{ok, {Module, {Covered, NotCovered}}} ->
{Module, Covered, NotCovered};
%% Modules that include the eunit header get an implicit
%% test/0 fun, which cover considers a runnable line, but
%% eunit:test(TestRepresentation) never calls. Decrement
%% NotCovered in this case.
align_notcovered_count(Module, Covered, NotCovered,
is_eunitized(Module));
{error, Reason} ->
?ERROR("Cover analyze failed for ~p: ~p ~p\n",
[Module, Reason, code:which(Module)]),
{0,0}
end.
is_eunitized(Mod) ->
has_eunit_test_fun(Mod) andalso
has_eunit_header(Mod).
has_eunit_test_fun(Mod) ->
length([F || {exports, Funs} <- Mod:module_info(),
{F, 0} <- Funs,
F == test]) =/= 0.
has_eunit_header(Mod) ->
OrigEnv = set_proc_env(),
try has_header(Mod, "include/eunit.hrl")
after restore_proc_env(OrigEnv)
end.
has_header(Mod, Header) ->
{ok, {_, [{abstract_code, {_, AC}}]}} = beam_lib:chunks(Mod, [abstract_code]),
length([F || {attribute, 1, file, {F, 1}} <- AC,
string:str(F, Header) =/= 0]) =/= 0.
align_notcovered_count(Module, Covered, NotCovered, false) ->
{Module, Covered, NotCovered};
align_notcovered_count(Module, Covered, NotCovered, true) ->
{Module, Covered, NotCovered - 1}.
cover_write_index(Coverage, SrcModules) ->
{ok, F} = file:open(filename:join([?EUNIT_DIR, "index.html"]), [write]),
ok = file:write(F, "<html><head><title>Coverage Summary</title></head>\n"),

22
test/rebar_eunit_tests.erl
View file

@ -88,7 +88,7 @@ cover_with_suite_test_() ->
{"Only production modules get coverage reports",
assert_files_not_in("the temporary eunit directory",
[".eunit/myapp_mymod_tests.COVER.html",
".eunit/mysuite"])}]}.
".eunit/mysuite.COVER.html"])}]}.
expected_cover_generated_files() ->
[".eunit/index.html",
@ -96,6 +96,17 @@ expected_cover_generated_files() ->
".eunit/myapp_mymod.COVER.html",
".eunit/myapp_sup.COVER.html"].
cover_coverage_test_() ->
{"Coverage is accurately calculated",
setup, fun() -> setup_cover_project(), rebar("-v eunit") end,
fun teardown/1,
[{"Modules that include the EUnit header can still have 100% coverage",
%% cover notices the implicit EUnit test/0 func that never gets
%% called during eunit:test(TestRepresentation), so NotCounted
%% needs to be decremented in this case.
assert_full_coverage("myapp_mymod")}]}.
%% ====================================================================
%% Environment and Setup Tests
%% ====================================================================
@ -227,3 +238,12 @@ assert_files_not_in(Name, [File|T]) ->
assert_files_not_in(Name, T)];
assert_files_not_in(_, []) -> [].
assert_full_coverage(Mod) ->
fun() ->
{ok, F} = file:read_file(".eunit/index.html"),
Result = [X || X <- string:tokens(binary_to_list(F), "\n"),
string:str(X, Mod) =/= 0,
string:str(X, "100%") =/= 0],
file:close(F),
?assert(length(Result) == 1)
end.