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added is_subset_of() for testing set comparison #48

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added is_subset_of() for testing set comparison #48

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2a7b7da
added is_subset_of() for testing set comparison
Apr 4, 2016
78114e6
should fix py3 is_subset_of test cases
Apr 4, 2016
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11 changes: 11 additions & 0 deletions assertpy/assertpy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -685,6 +685,17 @@ def does_not_contain_entry(self, *entries):
self._err('Expected <%s> to not contain entry %s, but did.' % (self.val, e))
return self

### set assertions ###
def is_subset_of(self, superset):
"""Asserts that val is a set and its items are contained within the set, 'superset'"""
if not isinstance(self.val, (set, frozenset)):
raise TypeError('val is not a set/frozenset')
if not isinstance(superset, (set, frozenset)):
raise TypeError('argument is not a set/frozenset')
if not self.val.issubset(superset):
self._err('Expected <%s> to be a subset of <%s>, but was not.' % (self.val, superset))
return self

### datetime assertions ###
def is_before(self, other):
"""Asserts that val is a date and is before other date."""
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38 changes: 38 additions & 0 deletions tests/test_set.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@
from assertpy import assert_that,fail

class TestSet(object):

def test_val_type_error(self):
try:
assert_that(1).is_subset_of(set([1,2]))
fail('should have raised TypeError')
except TypeError:
pass

def test_arg_type_error(self):
try:
assert_that(set([])).is_subset_of(None)
fail('should have raised TypeError')
except TypeError:
pass

def test_val_edge_case(self):
assert_that(set()).is_subset_of(set([1,2,3]))

def test_arg_edge_case(self):
try:
assert_that(set([1,2,3])).is_subset_of(set())
fail('should have raised error')
except AssertionError as ex:
assert_that(str(ex)).is_equal_to('Expected <%s> to be a subset of <%s>, but was not.' % (set([1,2,3]), set()))

def test_positive_normal_case(self):
assert_that(set([1])).is_subset_of(set([1,2,3]))

def test_negative_normal_case(self):
try:
assert_that(set([1,2,3])).is_subset_of(set([1]))
fail('should have raised error')
except AssertionError as ex:
assert_that(str(ex)).is_equal_to('Expected <%s> to be a subset of <%s>, but was not.' % (set([1,2,3]), set([1])))