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assert_that.py
from __future__ import absolute_import from hamcrest.core.matcher import Matcher from hamcrest.core.string_description import StringDescription __author__ = "Jon Reid" __copyright__ = "Copyright 2011 hamcrest.org" __license__ = "BSD, see License.txt" # unittest integration; hide these frames from tracebacks __unittest = True # py.test integration; hide these frames from tracebacks __tracebackhide__ = True def assert_that(arg1, arg2=None, arg3=''): """Asserts that actual value satisfies matcher. (Can also assert plain boolean condition.) :param actual: The object to evaluate as the actual value. :param matcher: The matcher to satisfy as the expected condition. :param reason: Optional explanation to include in failure description. ``assert_that`` passes the actual value to the matcher for evaluation. If the matcher is not satisfied, an exception is thrown describing the mismatch. ``assert_that`` is designed to integrate well with PyUnit and other unit testing frameworks. The exception raised for an unmet assertion is an :py:exc:`AssertionError`, which PyUnit reports as a test failure. With a different set of parameters, ``assert_that`` can also verify a boolean condition: .. function:: assert_that(assertion[, reason]) :param assertion: Boolean condition to verify. :param reason: Optional explanation to include in failure description. This is equivalent to the :py:meth:`~unittest.TestCase.assertTrue` method of :py:class:`unittest.TestCase`, but offers greater flexibility in test writing by being a standalone function. """ if isinstance(arg2, Matcher): _assert_match(actual=arg1, matcher=arg2, reason=arg3) else: _assert_bool(assertion=arg1, reason=arg2) def _assert_match(actual, matcher, reason): if not matcher.matches(actual): description = StringDescription() description.append_text(reason) \ .append_text('\nExpected: ') \ .append_description_of(matcher) \ .append_text('\n but: ') matcher.describe_mismatch(actual, description) description.append_text('\n') raise AssertionError(description) def _assert_bool(assertion, reason=None): if not assertion: if not reason: reason = 'Assertion failed' raise AssertionError(reason)