Whitelist allowed test names

unittests/errors_test.py

Index: unittests/errors_test.py
diff --git a/unittests/errors_test.py b/unittests/errors_test.py
index ab8d4a5ebf9fe4d9cb288f93d31e77e9a101c26f..fc9a1f33ed4e8153e4a746018abe1b36d76f278d 100755
--- a/unittests/errors_test.py
+++ b/unittests/errors_test.py
@@ -339,8 +339,23 @@ def RunSteps(api):
       self.assertRegexpMatches(
           stdout, r'\./foo/bar/recipes\.py run .* do_nothing')
 
+  def test_invalid_test_names(self):
+    # Full tests in recipe_engine/unittests/recipe_test_api_test.py
+    with RecipeRepo() as repo:
+      repo.make_recipe('test_recipe', """
+DEPS = []
+def RunSteps(api):
+  pass
 
-
+def GenTests(api):
+  yield api.test('best test')
+""")
+      subp = subprocess.Popen(
+                    repo.recipes_cmd + ['simulation_test', 'test_recipe'],
+                    stdout=subprocess.PIPE)
+      stdout, _ = subp.communicate()
+      self.assertIn('Traceback', stdout)
+      self.assertIn('Invalid test name', stdout)
 
 
 if __name__ == '__main__':