Merge "Fail when no test case selected"

os_testr/ostestr.py

@@ -256,6 +256,10 @@ def _call_testr_with_list(opts, test_list, others):
         print("\n".join(test_list))
         return 0
 
+    if not test_list:
+        print("No testcase selected to run")
+        return 8
+
     ec = call_testr(None, opts.subunit, opts.pretty, opts.list,
                     opts.slowest, opts.parallel, opts.concurrency,
                     opts.until_failure, opts.color, test_list, others)

os_testr/tests/test_return_codes.py

@@ -102,3 +102,6 @@ class TestReturnCodes(base.TestCase):
 
     def test_list(self):
         self.assertRunExit('ostestr --list', 0)
+
+    def test_no_test(self):
+        self.assertRunExit('ostestr --regex a --black-regex a', 8)