Allow behaviors defined inside xref_extra_path

Use case: xref'ing a module that defined behavior ranch_protocol was
exiting with
{'EXIT',{undef,[{ranch_protocol,behaviour_info, [callbacks],[]}

1 files changed, 32 insertions, 0 deletions

diff --git a/inttest/xref_behavior/xref_behavior_rt.erl b/inttest/xref_behavior/xref_behavior_rt.erl
new file mode 100644
index 0000000..8536710
--- /dev/null
+++ b/inttest/xref_behavior/xref_behavior_rt.erl
@@ -0,0 +1,32 @@
+-module(xref_behavior_rt).
+
+-export([files/0, run/1]).
+
+files() ->
+    [
+     {copy, "../../rebar", "rebar"},
+     {copy, "rebar.config", "rebar.config"},
+     {copy, "xref_behavior.erl", "src/xref_behavior.erl"},
+     {copy, "gen_xref_behavior.erl", "src/gen_xref_behavior.erl"},
+     {create, "ebin/xref_behavior.app", app(xref_behavior,
+                                            [xref_behavior,
+                                             gen_xref_behavior])}
+    ].
+
+run(_Dir) ->
+    {ok, _} = retest_sh:run("./rebar compile", []),
+    {ok, _} = retest_sh:run("./rebar xref", []),
+    ok.
+
+%%
+%% Generate the contents of a simple .app file
+%%
+app(Name, Modules) ->
+    App = {application, Name,
+           [{description, atom_to_list(Name)},
+            {vsn, "1"},
+            {modules, Modules},
+            {registered, []},
+            {applications, [kernel, stdlib]}]},
+    io_lib:format("~p.\n", [App]).
+