versioner: add missing test.

Change-Id: I1dc9a708b53dbb46af9e4b8ab69bf8ed46ab045f
diff --git a/tools/versioner/tests/version_mismatch/expected_fail b/tools/versioner/tests/version_mismatch/expected_fail
new file mode 100644
index 0000000..7f0709c
--- /dev/null
+++ b/tools/versioner/tests/version_mismatch/expected_fail
@@ -0,0 +1,2 @@
+foo: availability mismatch between arm-9 and arm-12: [introduced = 9] before, [introduced = 10] after
+versioner: sanity check failed