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from hamcrest.core.base_matcher import BaseMatcher
__author__ = "Chris Rose"
__copyright__ = "Copyright 2012 hamcrest.org"
__license__ = "BSD, see License.txt"
class IsEmpty(BaseMatcher):
def matches(self, item, mismatch_description=None):
try:
if len(item) == 0:
return True
if mismatch_description:
mismatch_description \
.append_text('has %d item(s)' % len(item))
except TypeError:
if mismatch_description:
mismatch_description \
.append_text('does not support length')
return False
def describe_to(self, description):
description.append_text('an empty collection')
def empty():
"""
This matcher matches any collection-like object that responds to the
__len__ method, and has a length of 0.
"""
return IsEmpty()
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