1 files changed, 105 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 0000000000..53984dba48
--- /dev/null
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_errors.py
@@ -0,0 +1,105 @@
+# 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
+
+import six
+
+from marionette_driver import errors
+
+from marionette_harness import marionette_test
+
+
+def fake_cause():
+    try:
+        raise ValueError("bar")
+    except ValueError:
+        return sys.exc_info()
+
+
+message = "foo"
+unicode_message = "\u201Cfoo"
+cause = fake_cause()
+stacktrace = "first\nsecond"
+
+
+class TestErrors(marionette_test.MarionetteTestCase):
+    def test_defaults(self):
+        exc = errors.MarionetteException()
+        self.assertEqual(str(exc), "None")
+        self.assertIsNone(exc.cause)
+        self.assertIsNone(exc.stacktrace)
+
+    def test_construction(self):
+        exc = errors.MarionetteException(
+            message=message, cause=cause, stacktrace=stacktrace
+        )
+        self.assertEqual(exc.message, message)
+        self.assertEqual(exc.cause, cause)
+        self.assertEqual(exc.stacktrace, stacktrace)
+
+    def test_str_message(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_unicode_message(self):
+        exc = errors.MarionetteException(
+            message=unicode_message, cause=cause, stacktrace=stacktrace
+        )
+        r = six.text_type(exc)
+        self.assertIn(unicode_message, r)
+        self.assertIn(", caused by {0!r}".format(cause[0]), r)
+        self.assertIn("\nstacktrace:\n\tfirst\n\tsecond", r)
+
+    def test_unicode_message_as_str(self):
+        exc = errors.MarionetteException(
+            message=unicode_message, cause=cause, stacktrace=stacktrace
+        )
+        r = str(exc)
+        self.assertIn(six.ensure_str(unicode_message, encoding="utf-8"), 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("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'"
+            )