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-rw-r--r--lib/testtools/testtools/tests/test_testtools.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/testtools/testtools/tests/test_testtools.py b/lib/testtools/testtools/tests/test_testtools.py
index 2845730f9f..2e722e919d 100644
--- a/lib/testtools/testtools/tests/test_testtools.py
+++ b/lib/testtools/testtools/tests/test_testtools.py
@@ -375,6 +375,10 @@ class TestAssertions(TestCase):
'42 is not an instance of %s' % self._formatTypes([Foo, Bar]),
self.assertIsInstance, 42, (Foo, Bar))
+ def test_assertIsInstance_overridden_message(self):
+ # assertIsInstance(obj, klass, msg) permits a custom message.
+ self.assertFails("foo", self.assertIsInstance, 42, str, "foo")
+
def test_assertIs(self):
# assertIs asserts that an object is identical to another object.
self.assertIs(None, None)