test_assert_raises_regex.py

from unittest import TestCase


def some_method(msg):
    raise ValueError(msg)


class MyTest(TestCase):

    def test_assert_raises_regex(self):
        with self.assertRaisesRegex(ValueError, r'some message'):
            some_method("expect some message")

    def test_assert_raises_regex_with_newline(self):
        with self.assertRaisesRegex(ValueError, r'expect\n some'):
            some_method("expect\n some message")

    def test_assert_raises_regex_with_newline_and_anchor(self):
        with self.assertRaisesRegex(ValueError, r'expect\n some.*$'):
            some_method("expect\n some message")

    def test_assert_raises_regex_with_newline_and_anchor_and_quotes(self):
        with self.assertRaisesRegex(ValueError, r'expect\n some ".*$'):
            some_method("expect\n some \"message")