Replace cm.exception.messages with assertRaisesMessage() in tests

[Tim Graham]

I haven't audited each instance, but most likely many of the uses of cm.exception.messages could be made more consistent with the rest of the Django test suite by instead using self.assertRaisesMessage().

tests/composite_pk/test_models.py:                self.assertSequenceEqual(ctx.exception.messages, messages)
tests/composite_pk/test_models.py:            ctx.exception.messages, ("User with this Email already exists.",)
tests/validation/test_error_messages.py:        self.assertEqual(cm.exception.messages, expected)
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [msg_too_short])
tests/auth_tests/test_validators.py:            cm.exception.messages, ["This password is too common.", msg_too_short]
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error % 8])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error % 3])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error % "username"])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error % "email address"])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error % "first name"])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error % "first name"])
tests/auth_tests/test_validators.py:            cm.exception.messages, ["The password is too similar to the username."]
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error])
tests/auth_tests/test_validators.py:                self.assertEqual(cm.exception.messages, [expected_error])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error])
tests/auth_tests/test_validators.py:        self.assertEqual(cm.exception.messages, [expected_error])
tests/forms_tests/tests/test_error_messages.py:        self.assertEqual(cm.exception.messages, expected)
tests/forms_tests/tests/test_validators.py:        self.assertEqual(2, len(e.exception.messages))
tests/test_exceptions/test_validation_error.py:        self.assertEqual(sorted(exception.messages), [])
tests/test_exceptions/test_validation_error.py:        self.assertEqual(sorted(exception.messages), ["E1", "E2"])
tests/test_exceptions/test_validation_error.py:        self.assertEqual(sorted(exception.messages), ["E1", "E2", "E3", "E4"])
tests/postgres_tests/test_array.py:            cm.exception.messages[0],
tests/postgres_tests/test_array.py:            cm.exception.messages[0], "Nested arrays must have the same length."
tests/postgres_tests/test_array.py:            cm.exception.messages[0],
tests/postgres_tests/test_array.py:            cm.exception.messages[0],
tests/postgres_tests/test_array.py:            cm.exception.messages[0],
tests/postgres_tests/test_array.py:            cm.exception.messages[0],
tests/postgres_tests/test_array.py:            cm.exception.messages[0],
tests/postgres_tests/test_array.py:        self.assertEqual(cm.exception.messages[0], "This field is required.")
tests/postgres_tests/test_array.py:            cm.exception.messages,
tests/postgres_tests/test_array.py:            cm.exception.messages,
tests/postgres_tests/test_hstore.py:        self.assertEqual(cm.exception.messages[0], "Could not load JSON data.")
tests/postgres_tests/test_hstore.py:        self.assertEqual(cm.exception.messages[0], "Some keys were missing: b")
tests/postgres_tests/test_hstore.py:        self.assertEqual(cm.exception.messages[0], "Some unknown keys were provided: c")
tests/postgres_tests/test_hstore.py:        self.assertEqual(cm.exception.messages[0], "Foobar")
tests/postgres_tests/test_hstore.py:        self.assertEqual(cm.exception.messages[0], "Some unknown keys were provided: c")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], msg)
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], msg)
tests/postgres_tests/test_ranges.py:            cm.exception.messages[0],
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter two whole numbers.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a whole number.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a whole number.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "This field is required.")
tests/postgres_tests/test_ranges.py:            cm.exception.messages[0],
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter two numbers.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a number.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a number.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "This field is required.")
tests/postgres_tests/test_ranges.py:            cm.exception.messages[0],
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter two valid dates.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a valid date.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a valid date.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "This field is required.")
tests/postgres_tests/test_ranges.py:            cm.exception.messages[0],
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter two valid date/times.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a valid date/time.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "Enter a valid date/time.")
tests/postgres_tests/test_ranges.py:        self.assertEqual(cm.exception.messages[0], "This field is required.")