Add z_SUITE to validate loaded code

If we want to have test cases that run eprof, we must make sure that
there are no modules loaded that don't have a working module_info/1
function, since eprof calls module_info(functions) to retrieve the
list of functions in the module. Some test cases load modules compiled
from Core Erlang that don't have any module_info/1 functions, so
we will need make sure that all such modules have been unloaded.

Add z_SUITE:loaded/1 to run after all other test cases to verify that
all modules that the code server consider loaded are indeed loaded and
all have working module_info/0,1 functions.

2 files changed, 63 insertions, 0 deletions

diff --git a/lib/compiler/test/Makefile b/lib/compiler/test/Makefile
index e1498e564e..98125fc84e 100644
--- a/lib/compiler/test/Makefile
+++ b/lib/compiler/test/Makefile
@@ -35,6 +35,7 @@ MODULES= \
 	record_SUITE \
 	trycatch_SUITE \
 	warnings_SUITE \
+	z_SUITE \
 	test_lib
 
 NO_OPT= \
diff --git a/lib/compiler/test/z_SUITE.erl b/lib/compiler/test/z_SUITE.erl
new file mode 100644
index 0000000000..eff8a1877f
--- /dev/null
+++ b/lib/compiler/test/z_SUITE.erl
@@ -0,0 +1,62 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2015. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(z_SUITE).
+
+-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
+	 init_per_group/2,end_per_group/2,
+	 loaded/1]).
+
+suite() -> [{ct_hooks,[ts_install_cth]}].
+
+all() ->
+    test_lib:recompile(?MODULE),
+    [loaded].
+
+groups() ->
+    [].
+
+init_per_suite(Config) ->
+    Config.
+
+end_per_suite(_Config) ->
+    ok.
+
+init_per_group(_GroupName, Config) ->
+    Config.
+
+end_per_group(_GroupName, Config) ->
+    Config.
+
+loaded(_Config) ->
+    0 = do_loaded(code:all_loaded(), 0),
+    ok.
+
+do_loaded([{M,_}|Ms], E0) ->
+    E = try
+	    _ = M:module_info(),
+	    _ = M:module_info(functions),
+	    E0
+	catch
+	    C:Error ->
+		Stk = erlang:get_stacktrace(),
+		io:format("~p:~p\n~p\n", [C,Error,Stk]),
+		E0 + 1
+	end,
+    do_loaded(Ms, E);
+do_loaded([], E) -> E.