def has_property(name, match=None):
"""Matches if object has a property with a given name whose value satisfies
a given matcher.
:param name: The name of the property.
:param match: Optional matcher to satisfy.
This matcher determines if the evaluated object has a property with a given
name. If no such property is found, ``has_property`` is not satisfied.
If the property is found, its value is passed to a given matcher for
evaluation. If the ``match`` argument is not a matcher, it is implicitly
wrapped in an :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to
check for equality.
If the ``match`` argument is not provided, the
:py:func:`~hamcrest.core.core.isanything.anything` matcher is used so that
``has_property`` is satisfied if a matching property is found.
Examples::
has_property('name', starts_with('J'))
has_property('name', 'Jon')
has_property('name')
"""
if match is None:
match = anything()
return IsObjectWithProperty(name, wrap_shortcut(match))
def has_property(name, match=None):
"""Matches if object has a property with a given name whose value satisfies
a given matcher.
:param name: The name of the property.
:param match: Optional matcher to satisfy.
This matcher determines if the evaluated object has a property with a given
name. If no such property is found, ``has_property`` is not satisfied.
If the property is found, its value is passed to a given matcher for
evaluation. If the ``match`` argument is not a matcher, it is implicitly
wrapped in an :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to
check for equality.
If the ``match`` argument is not provided, the
:py:func:`~hamcrest.core.core.isanything.anything` matcher is used so that
``has_property`` is satisfied if a matching property is found.
Examples::
has_property('name', starts_with('J'))
has_property('name', 'Jon')
has_property('name')
"""
if match is None:
match = anything()
return IsObjectWithProperty(name, wrap_shortcut(match))
def has_property(name, value=None):
"""Matches objects that have a property matching the given value matcher.
:param name: The name of the property that the object must have. If the object
does not have this property, the matcher will fail.
:param value: The value to match. If the value is not provided, the
matcher will match against anything(), which transforms this
matcher into a property existence check.
"""
if value is None:
value = anything()
return IsObjectWithProperty(name, wrap_shortcut(value))
def has_method_with_return_value(
name: str,
args: Iterable[Any] = None,
kwargs: Mapping[str, Any] = None,
match: Optional[Union[Matcher[Any], Any]] = None,
) -> Matcher[object]:
"""
Match against an object which has a method with the given name that, when
called with the given args and kwargs, returns the expected value.
Examples:
assert_that(
list(1, 2, 3), has_method_with_return_value("copy", [1, 2, 3])
)
assert_that(
dict((a, "Hello, world!")),
has_method_with_return_value(
"get", args=["a"], contains_string("world")
)
)
Args:
name: the name of the method to call.
args: the list of args to provide when calling.
kwargs: a dictionary of kwargs to pass when calling.
match: the expected value of calling the method.
Returns:
Matcher[object]
"""
if match is None:
match = not_none()
return IsObjectWithCallableProducingValue(name,
wrap_shortcut(match),
args=args,
kwargs=kwargs)
def has_properties(*keys_valuematchers, **kv_args):
"""Matches if an object has properties satisfying all of a dictionary
of string property names and corresponding value matchers.
:param matcher_dict: A dictionary mapping keys to associated value matchers,
or to expected values for
:py:func:`~hamcrest.core.core.isequal.equal_to` matching.
Note that the keys must be actual keys, not matchers. Any value argument
that is not a matcher is implicitly wrapped in an
:py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for
equality.
Examples::
has_properties({'foo':equal_to(1), 'bar':equal_to(2)})
has_properties({'foo':1, 'bar':2})
``has_properties`` also accepts a list of keyword arguments:
.. function:: has_properties(keyword1=value_matcher1[, keyword2=value_matcher2[, ...]])
:param keyword1: A keyword to look up.
:param valueMatcher1: The matcher to satisfy for the value, or an expected
value for :py:func:`~hamcrest.core.core.isequal.equal_to` matching.
Examples::
has_properties(foo=equal_to(1), bar=equal_to(2))
has_properties(foo=1, bar=2)
Finally, ``has_properties`` also accepts a list of alternating keys and their
value matchers:
.. function:: has_properties(key1, value_matcher1[, ...])
:param key1: A key (not a matcher) to look up.
:param valueMatcher1: The matcher to satisfy for the value, or an expected
value for :py:func:`~hamcrest.core.core.isequal.equal_to` matching.
Examples::
has_properties('foo', equal_to(1), 'bar', equal_to(2))
has_properties('foo', 1, 'bar', 2)
"""
if len(keys_valuematchers) == 1:
try:
base_dict = keys_valuematchers[0].copy()
for key in base_dict:
base_dict[key] = wrap_shortcut(base_dict[key])
except AttributeError:
raise ValueError('single-argument calls to has_properties must pass a dict as the argument')
else:
if len(keys_valuematchers) % 2:
raise ValueError('has_properties requires key-value pairs')
base_dict = {}
for index in range(int(len(keys_valuematchers) / 2)):
base_dict[keys_valuematchers[2 * index]] = wrap_shortcut(keys_valuematchers[2 * index + 1])
for key, value in kv_args.items():
base_dict[key] = wrap_shortcut(value)
return all_of(*[has_property(property_name, property_value_matcher) for \
property_name, property_value_matcher in base_dict.items()])
def has_properties(*keys_valuematchers, **kv_args):
"""Matches if an object has properties satisfying all of a dictionary
of string property names and corresponding value matchers.
:param matcher_dict: A dictionary mapping keys to associated value matchers,
or to expected values for
:py:func:`~hamcrest.core.core.isequal.equal_to` matching.
Note that the keys must be actual keys, not matchers. Any value argument
that is not a matcher is implicitly wrapped in an
:py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for
equality.
Examples::
has_properties({'foo':equal_to(1), 'bar':equal_to(2)})
has_properties({'foo':1, 'bar':2})
``has_properties`` also accepts a list of keyword arguments:
.. function:: has_properties(keyword1=value_matcher1[, keyword2=value_matcher2[, ...]])
:param keyword1: A keyword to look up.
:param valueMatcher1: The matcher to satisfy for the value, or an expected
value for :py:func:`~hamcrest.core.core.isequal.equal_to` matching.
Examples::
has_properties(foo=equal_to(1), bar=equal_to(2))
has_properties(foo=1, bar=2)
Finally, ``has_properties`` also accepts a list of alternating keys and their
value matchers:
.. function:: has_properties(key1, value_matcher1[, ...])
:param key1: A key (not a matcher) to look up.
:param valueMatcher1: The matcher to satisfy for the value, or an expected
value for :py:func:`~hamcrest.core.core.isequal.equal_to` matching.
Examples::
has_properties('foo', equal_to(1), 'bar', equal_to(2))
has_properties('foo', 1, 'bar', 2)
"""
if len(keys_valuematchers) == 1:
try:
base_dict = keys_valuematchers[0].copy()
for key in base_dict:
base_dict[key] = wrap_shortcut(base_dict[key])
except AttributeError:
raise ValueError('single-argument calls to has_properties must pass a dict as the argument')
else:
if len(keys_valuematchers) % 2:
raise ValueError('has_properties requires key-value pairs')
base_dict = {}
for index in range(int(len(keys_valuematchers) / 2)):
base_dict[keys_valuematchers[2 * index]] = wrap_shortcut(keys_valuematchers[2 * index + 1])
for key, value in kv_args.items():
base_dict[key] = wrap_shortcut(value)
if len(base_dict) > 1:
description = StringDescription().append_text('an object with properties ')
for i, (property_name, property_value_matcher) in enumerate(sorted(base_dict.items())):
description.append_value(property_name).append_text(' matching ').append_description_of(
property_value_matcher)
if i < len(base_dict) - 1:
description.append_text(' and ')
return described_as(str(description),
AllOf(*[has_property(property_name, property_value_matcher)
for property_name, property_value_matcher
in sorted(base_dict.items())],
describe_all_mismatches=True,
describe_matcher_in_mismatch=False))
else:
property_name, property_value_matcher = base_dict.popitem()
return has_property(property_name, property_value_matcher)
