Issue #4444: Allow assertRaises() to be used as a context handler.
diff --git a/Lib/test/test_unittest.py b/Lib/test/test_unittest.py
index 5a82780..df656e4 100644
--- a/Lib/test/test_unittest.py
+++ b/Lib/test/test_unittest.py
@@ -2284,6 +2284,43 @@
self.assertRaises(AssertionError,
self.failIfAlmostEqual, 0, .1+.1j, places=0)
+ def test_assertRaises(self):
+ def _raise(e):
+ raise e
+ self.assertRaises(KeyError, _raise, KeyError)
+ self.assertRaises(KeyError, _raise, KeyError("key"))
+ try:
+ self.assertRaises(KeyError, lambda: None)
+ except AssertionError as e:
+ self.assert_("KeyError not raised" in e, str(e))
+ else:
+ self.fail("assertRaises() didn't fail")
+ try:
+ self.assertRaises(KeyError, _raise, ValueError)
+ except ValueError:
+ pass
+ else:
+ self.fail("assertRaises() didn't let exception pass through")
+ with self.assertRaises(KeyError):
+ raise KeyError
+ with self.assertRaises(KeyError):
+ raise KeyError("key")
+ try:
+ with self.assertRaises(KeyError):
+ pass
+ except AssertionError as e:
+ self.assert_("KeyError not raised" in e, str(e))
+ else:
+ self.fail("assertRaises() didn't fail")
+ try:
+ with self.assertRaises(KeyError):
+ raise ValueError
+ except ValueError:
+ pass
+ else:
+ self.fail("assertRaises() didn't let exception pass through")
+
+
######################################################################
## Main
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