1 files changed, 77 insertions, 0 deletions
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_errors.py b/testing/marionette/harness/marionette_harness/tests/unit/test_errors.py
new file mode 100644
index 000000000..f6a9c285c
--- /dev/null
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_errors.py
@@ -0,0 +1,77 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import sys
+
+from marionette_driver import errors
+
+from marionette_harness import marionette_test
+
+
+def fake_cause():
+    try:
+        raise ValueError("bar")
+    except ValueError as e:
+        return sys.exc_info()
+
+message = "foo"
+cause = fake_cause()
+stacktrace = "first\nsecond"
+
+class TestErrors(marionette_test.MarionetteTestCase):
+    def test_defaults(self):
+        exc = errors.MarionetteException()
+        self.assertIsNone(exc.message)
+        self.assertIsNone(exc.cause)
+        self.assertIsNone(exc.stacktrace)
+
+    def test_construction(self):
+        exc = errors.MarionetteException(
+            message=message, cause=cause, stacktrace=stacktrace)
+        self.assertEquals(exc.message, message)
+        self.assertEquals(exc.cause, cause)
+        self.assertEquals(exc.stacktrace, stacktrace)
+
+    def test_str(self):
+        exc = errors.MarionetteException(
+            message=message, cause=cause, stacktrace=stacktrace)
+        r = str(exc)
+        self.assertIn(message, r)
+        self.assertIn(", caused by {0!r}".format(cause[0]), r)
+        self.assertIn("\nstacktrace:\n\tfirst\n\tsecond", r)
+
+    def test_cause_string(self):
+        exc = errors.MarionetteException(cause="foo")
+        self.assertEqual(exc.cause, "foo")
+        r = str(exc)
+        self.assertIn(", caused by foo", r)
+
+    def test_cause_tuple(self):
+        exc = errors.MarionetteException(cause=cause)
+        self.assertEqual(exc.cause, cause)
+        r = str(exc)
+        self.assertIn(", caused by {0!r}".format(cause[0]), r)
+
+
+class TestLookup(marionette_test.MarionetteTestCase):
+    def test_by_unknown_number(self):
+        self.assertEqual(errors.MarionetteException, errors.lookup(123456))
+
+    def test_by_known_string(self):
+        self.assertEqual(errors.NoSuchElementException,
+            errors.lookup("no such element"))
+
+    def test_by_unknown_string(self):
+        self.assertEqual(errors.MarionetteException, errors.lookup("barbera"))
+
+    def test_by_known_unicode_string(self):
+        self.assertEqual(errors.NoSuchElementException,
+            errors.lookup(u"no such element"))
+
+
+class TestAllErrors(marionette_test.MarionetteTestCase):
+    def test_properties(self):
+        for exc in errors.es_:
+            self.assertTrue(hasattr(exc, "status"),
+                "expected exception to have attribute `status'")