Bug 1408385 - Make sure python-test tasks turn orange if no tests are run, r=davehunt

MozReview-Commit-ID: 8HAGvOg1Bbp

python/mach_commands.py

@@ -125,12 +125,6 @@ class MachCommands(MachCommandBase):
         mp = TestManifest()
         mp.tests.extend(test_objects)
 
-        if not mp.tests:
-            message = 'TEST-UNEXPECTED-FAIL | No tests collected ' + \
-                      '(Not in PYTHON_UNITTEST_MANIFESTS?)'
-            self.log(logging.WARN, 'python-test', {}, message)
-            return 1
-
         filters = []
         if subsuite == 'default':
             filters.append(mpf.subsuite(None))
@@ -138,6 +132,14 @@ class MachCommands(MachCommandBase):
             filters.append(mpf.subsuite(subsuite))
 
         tests = mp.active_tests(filters=filters, disabled=False, **mozinfo.info)
+
+        if not tests:
+            submsg = "for subsuite '{}' ".format(subsuite) if subsuite else ""
+            message = "TEST-UNEXPECTED-FAIL | No tests collected " + \
+                      "{}(Not in PYTHON_UNITTEST_MANIFESTS?)".format(submsg)
+            self.log(logging.WARN, 'python-test', {}, message)
+            return 1
+
         parallel = []
         sequential = []
         for test in tests: