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from hamcrest.core.base_matcher import BaseMatcher |
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from hamcrest.core.helpers.hasmethod import hasmethod |
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from hamcrest.core.helpers.wrap_matcher import wrap_matcher |
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__author__ = "Jon Reid" |
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__copyright__ = "Copyright 2011 hamcrest.org" |
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__license__ = "BSD, see License.txt" |
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class HasLength(BaseMatcher): |
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def __init__(self, len_matcher): |
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self.len_matcher = len_matcher |
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def _matches(self, item): |
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if not hasmethod(item, '__len__'): |
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return False |
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return self.len_matcher.matches(len(item)) |
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def describe_mismatch(self, item, mismatch_description): |
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super(HasLength, self).describe_mismatch(item, mismatch_description) |
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if hasmethod(item, '__len__'): |
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mismatch_description.append_text(' with length of ') \ |
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.append_description_of(len(item)) |
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def describe_to(self, description): |
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description.append_text('an object with length of ') \ |
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.append_description_of(self.len_matcher) |
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def has_length(match): |
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"""Matches if ``len(item)`` satisfies a given matcher. |
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:param match: The matcher to satisfy, or an expected value for |
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:py:func:`~hamcrest.core.core.isequal.equal_to` matching. |
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This matcher invokes the :py:func:`len` function on the evaluated object to |
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get its length, passing the result to a given matcher for evaluation. |
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If the ``match`` argument is not a matcher, it is implicitly wrapped in an |
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:py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for |
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:equality. |
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Examples:: |
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has_length(greater_than(6)) |
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has_length(5) |
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""" |
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return HasLength(wrap_matcher(match)) |
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hamcrest /
PyHamcrest
