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from collections import OrderedDict
from collections.abc import Iterable as IterableABC
from decimal import Decimal
from difflib import unified_diff
from functools import partial as partial_type, reduce
from operator import __or__
from pprint import pformat
from typing import (
Dict, Any, Optional, Sequence, Generator, TypeVar, List, Mapping, Pattern, Union,
Callable, Iterable
)
from types import GeneratorType
import re
from testfixtures import not_there, singleton
from testfixtures.resolve import resolve
from testfixtures.utils import indent
from testfixtures.mock import parent_name, mock_call
from unittest.mock import call as unittest_mock_call
# Some common types that are immutable, for optimisation purposes within CompareContext
IMMUTABLE_TYPEs = str, bytes, int, float, tuple, type(None)
def diff(x: str, y: str, x_label: str = '', y_label: str = ''):
"""
A shorthand function that uses :mod:`difflib` to return a
string representing the differences between the two string
arguments.
Most useful when comparing multi-line strings.
"""
return '\n'.join(
unified_diff(
x.split('\n'),
y.split('\n'),
x_label or 'first',
y_label or 'second',
lineterm='')
)
def compare_simple(x, y, context: 'CompareContext'):
"""
Returns a very simple textual difference between the two supplied objects.
"""
if x != y:
repr_x = repr(x)
repr_y = repr(y)
if repr_x == repr_y:
if type(x) is not type(y):
return compare_with_type(x, y, context)
x_attrs = _extract_attrs(x)
y_attrs = _extract_attrs(y)
diff_ = None
if not (x_attrs is None or y_attrs is None):
diff_ = _compare_mapping(x_attrs, y_attrs, context, x,
'attributes ', '.%s')
if diff_:
return diff_
return 'Both %s and %s appear as %r, but are not equal!' % (
context.x_label or 'x', context.y_label or 'y', repr_x
)
return context.label('x', repr_x) + ' != ' + context.label('y', repr_y)
def _extract_attrs(obj, ignore: Iterable[str] = None) -> Optional[Dict[str, Any]]:
try:
attrs = vars(obj).copy()
except TypeError:
attrs = None
else:
if isinstance(obj, BaseException):
attrs['args'] = obj.args
has_slots = getattr(obj, '__slots__', not_there) is not not_there
if has_slots:
slots = set()
for cls in type(obj).__mro__:
slots.update(getattr(cls, '__slots__', ()))
if slots and attrs is None:
attrs = {}
for n in slots:
value = getattr(obj, n, not_there)
if value is not not_there:
attrs[n] = value
if attrs is None:
return None
if ignore is not None:
for attr in ignore:
attrs.pop(attr, None)
return attrs
def _attrs_to_ignore(
context: 'CompareContext', ignore_attributes: Iterable[str], obj
) -> Iterable[str]:
ignore = context.get_option('ignore_attributes', ())
if isinstance(ignore, dict):
ignore = ignore.get(type(obj), ())
ignore = set(ignore)
ignore.update(ignore_attributes)
return ignore
def compare_object(
x, y, context: 'CompareContext', ignore_attributes: Iterable[str] = ()
) -> Optional[str]:
"""
Compare the two supplied objects based on their type and attributes.
:param ignore_attributes:
Either a sequence of strings containing attribute names to be ignored
when comparing or a mapping of type to sequence of strings containing
attribute names to be ignored when comparing that type.
This may be specified as either a parameter to this function or in the
``context``. If specified in both, they will both apply with precedence
given to whatever is specified is specified as a parameter.
If specified as a parameter to this function, it may only be a list of
strings.
"""
if type(x) is not type(y) or isinstance(x, type):
return compare_simple(x, y, context)
x_attrs = _extract_attrs(x, _attrs_to_ignore(context, ignore_attributes, x))
y_attrs = _extract_attrs(y, _attrs_to_ignore(context, ignore_attributes, y))
if x_attrs is None or y_attrs is None or not (x_attrs and y_attrs):
return compare_simple(x, y, context)
if context.ignore_eq or x_attrs != y_attrs:
return _compare_mapping(x_attrs, y_attrs, context, x,
'attributes ', '.%s')
def compare_exception(
x: Exception, y: Exception, context: 'CompareContext'
) -> Optional[str]:
"""
Compare the two supplied exceptions based on their message, type and
attributes.
"""
if x.args != y.args:
return compare_simple(x, y, context)
return compare_object(x, y, context)
def compare_with_type(x, y, context: 'CompareContext') -> str:
"""
Return a textual description of the difference between two objects
including information about their types.
"""
if type(x) is AlreadySeen and type(x.obj) is type(y) and x.obj == y:
return ''
source = locals()
to_render = {}
for name in 'x', 'y':
obj = source[name]
to_render[name] = context.label(
name,
'{0} ({1!r})'.format(_short_repr(obj), type(obj))
)
return '{x} != {y}'.format(**to_render)
def compare_sequence(
x: Sequence, y: Sequence, context: 'CompareContext', prefix: bool = True
) -> Optional[str]:
"""
Returns a textual description of the differences between the two
supplied sequences.
"""
l_x = len(x)
l_y = len(y)
i = 0
while i < l_x and i < l_y:
if context.different(x[i], y[i], '[%i]' % i):
break
i += 1
if l_x == l_y and i == l_x:
return
return (('sequence not as expected:\n\n' if prefix else '')+
'same:\n%s\n\n'
'%s:\n%s\n\n'
'%s:\n%s') % (pformat(x[:i]),
context.x_label or 'first', pformat(x[i:]),
context.y_label or 'second', pformat(y[i:]),
)
def compare_generator(x: Generator, y: Generator, context: 'CompareContext') -> Optional[str]:
"""
Returns a textual description of the differences between the two
supplied generators.
This is done by first unwinding each of the generators supplied
into tuples and then passing those tuples to
:func:`compare_sequence`.
"""
x = tuple(x)
y = tuple(y)
if not context.ignore_eq and x == y:
return
return compare_sequence(x, y, context)
def compare_tuple(x: tuple, y: tuple, context: 'CompareContext') -> Optional[str]:
"""
Returns a textual difference between two tuples or
:func:`collections.namedtuple` instances.
The presence of a ``_fields`` attribute on a tuple is used to
decide whether or not it is a :func:`~collections.namedtuple`.
"""
x_fields = getattr(x, '_fields', None)
y_fields = getattr(y, '_fields', None)
if x_fields and y_fields:
if x_fields == y_fields:
return _compare_mapping(dict(zip(x_fields, x)),
dict(zip(y_fields, y)),
context,
x)
else:
return compare_with_type(x, y, context)
return compare_sequence(x, y, context)
def compare_dict(x: dict, y: dict, context: 'CompareContext') -> Optional[str]:
"""
Returns a textual description of the differences between the two
supplied dictionaries.
"""
return _compare_mapping(x, y, context, x)
Item = TypeVar('Item')
def sorted_by_repr(sequence: Iterable[Item]) -> List[Item]:
return sorted(sequence, key=lambda o: repr(o))
def _compare_mapping(
x: Mapping, y: Mapping, context: 'CompareContext', obj_for_class: Any,
prefix: str = '', breadcrumb: str = '[%r]',
check_y_not_x: bool = True
) -> Optional[str]:
x_keys = set(x.keys())
y_keys = set(y.keys())
x_not_y = x_keys - y_keys
y_not_x = y_keys - x_keys
same = []
diffs = []
for key in sorted_by_repr(x_keys.intersection(y_keys)):
if context.different(x[key], y[key], breadcrumb % (key, )):
diffs.append('%r: %s != %s' % (
key,
context.label('x', pformat(x[key])),
context.label('y', pformat(y[key])),
))
else:
same.append(key)
if not (x_not_y or (check_y_not_x and y_not_x) or diffs):
return
if obj_for_class is not_there:
lines = []
else:
lines = ['%s not as expected:' % obj_for_class.__class__.__name__]
if same:
try:
same = sorted(same)
except TypeError:
pass
lines.extend(('', '%ssame:' % prefix, repr(same)))
x_label = context.x_label or 'first'
y_label = context.y_label or 'second'
if x_not_y:
lines.extend(('', '%sin %s but not %s:' % (prefix, x_label, y_label)))
for key in sorted_by_repr(x_not_y):
lines.append('%r: %s' % (
key,
pformat(x[key])
))
if y_not_x:
lines.extend(('', '%sin %s but not %s:' % (prefix, y_label, x_label)))
for key in sorted_by_repr(y_not_x):
lines.append('%r: %s' % (
key,
pformat(y[key])
))
if diffs:
lines.extend(('', '%sdiffer:' % (prefix or 'values ')))
lines.extend(diffs)
return '\n'.join(lines)
def compare_set(x: set, y: set, context: 'CompareContext') -> Optional[str]:
"""
Returns a textual description of the differences between the two
supplied sets.
"""
x_not_y = x - y
y_not_x = y - x
if not (y_not_x or x_not_y):
return
lines = ['%s not as expected:' % x.__class__.__name__, '']
x_label = context.x_label or 'first'
y_label = context.y_label or 'second'
if x_not_y:
lines.extend((
'in %s but not %s:' % (x_label, y_label),
pformat(sorted_by_repr(x_not_y)),
'',
))
if y_not_x:
lines.extend((
'in %s but not %s:' % (y_label, x_label),
pformat(sorted_by_repr(y_not_x)),
'',
))
return '\n'.join(lines)+'\n'
trailing_whitespace_re: Pattern = re.compile(r'\s+$', re.MULTILINE)
def strip_blank_lines(text: str) -> str:
result = []
for line in text.split('\n'):
if line and not line.isspace():
result.append(line)
return '\n'.join(result)
def split_repr(text: str) -> str:
parts = text.split('\n')
for i, part in enumerate(parts[:-1]):
parts[i] = repr(part + '\n')
parts[-1] = repr(parts[-1])
return '\n'.join(parts)
def compare_text(x: str, y: str, context: 'CompareContext'):
"""
Returns an informative string describing the differences between the two
supplied strings. The way in which this comparison is performed
can be controlled using the following parameters:
:param blanklines: If `False`, then when comparing multi-line
strings, any blank lines in either argument
will be ignored.
:param trailing_whitespace: If `False`, then when comparing
multi-line strings, trailing
whilespace on lines will be ignored.
:param show_whitespace: If `True`, then whitespace characters in
multi-line strings will be replaced with their
representations.
"""
blanklines = context.get_option('blanklines', True)
trailing_whitespace = context.get_option('trailing_whitespace', True)
show_whitespace = context.get_option('show_whitespace', False)
if not trailing_whitespace:
x = trailing_whitespace_re.sub('', x)
y = trailing_whitespace_re.sub('', y)
if not blanklines:
x = strip_blank_lines(x)
y = strip_blank_lines(y)
if x == y:
return
labelled_x = context.label('x', repr(x))
labelled_y = context.label('y', repr(y))
if len(x) > 10 or len(y) > 10:
if '\n' in x or '\n' in y:
if show_whitespace:
x = split_repr(x)
y = split_repr(y)
message = '\n' + diff(x, y, context.x_label, context.y_label)
else:
message = '\n%s\n!=\n%s' % (labelled_x, labelled_y)
else:
message = labelled_x+' != '+labelled_y
return message
def compare_bytes(x: bytes, y: bytes, context: 'CompareContext') -> Optional[str]:
if x == y:
return
labelled_x = context.label('x', repr(x))
labelled_y = context.label('y', repr(y))
return '\n%s\n!=\n%s' % (labelled_x, labelled_y)
def compare_call(x, y, context: 'CompareContext') -> Optional[str]:
if x == y:
return
def extract(call):
try:
name, args, kwargs = call
except ValueError:
name = None
args, kwargs = call
return name, args, kwargs
x_name, x_args, x_kw = extract(x)
y_name, y_args, y_kw = extract(y)
if x_name == y_name and x_args == y_args and x_kw == y_kw:
return compare_call(getattr(x, parent_name), getattr(y, parent_name), context)
if repr(x) != repr(y):
return compare_text(repr(x), repr(y), context)
different = (
context.different(x_name, y_name, ' function name') or
context.different(x_args, y_args, ' args') or
context.different(x_kw, y_kw, ' kw')
)
if not different:
return
return 'mock.call not as expected:'
def compare_partial(x: partial_type, y: partial_type, context: 'CompareContext') -> Optional[str]:
x_attrs = dict(func=x.func, args=x.args, keywords=x.keywords)
y_attrs = dict(func=y.func, args=y.args, keywords=y.keywords)
if x_attrs != y_attrs:
return _compare_mapping(x_attrs, y_attrs, context, x,
'attributes ', '.%s')
def _short_repr(obj) -> str:
repr_ = repr(obj)
if len(repr_) > 30:
repr_ = repr_[:30] + '...'
return repr_
Comparer = Callable[[Any, Any, 'CompareContext'], Optional[str]]
Registry = Dict[type, Comparer]
_registry: Registry = {
dict: compare_dict,
set: compare_set,
list: compare_sequence,
tuple: compare_tuple,
str: compare_text,
bytes: compare_bytes,
int: compare_simple,
float: compare_simple,
Decimal: compare_simple,
GeneratorType: compare_generator,
mock_call.__class__: compare_call,
unittest_mock_call.__class__: compare_call,
BaseException: compare_exception,
partial_type: compare_partial,
}
def register(type_: type, comparer: Comparer):
"""
Register the supplied comparer for the specified type.
This registration is global and will be in effect from the point
this function is called until the end of the current process.
"""
_registry[type_] = comparer
def _shared_mro(x, y):
y_mro = set(type(y).__mro__)
for class_ in type(x).__mro__:
if class_ in y_mro:
yield class_
_unsafe_iterables = str, bytes, dict
class AlreadySeen:
def __init__(self, id_, obj, breadcrumb):
self.id = id_
self.obj = obj
self.breadcrumb = breadcrumb
def __repr__(self):
return f'<AlreadySeen for {self.obj!r} at {self.breadcrumb} with id {self.id}>'
def __eq__(self, other):
if isinstance(other, AlreadySeen):
return self.breadcrumb == other.breadcrumb
else:
return self.obj == other
class CompareContext(object):
"""
Stores the context of the current comparison in process during a call to
:func:`testfixtures.compare`.
"""
def __init__(
self,
x_label: Optional[str],
y_label: Optional[str],
recursive: bool = True,
strict: bool = False,
ignore_eq: bool = False,
comparers: Registry = None,
options: Dict[str, Any] = None,
):
self.registries = []
if comparers:
self.registries.append(comparers)
self.registries.append(_registry)
self.x_label = x_label
self.y_label = y_label
self.recursive: bool = recursive
self.strict: bool = strict
self.ignore_eq: bool = ignore_eq
self.options: Dict[str, Any] = options or {}
self.message: str = ''
self.breadcrumbs: List[str] = []
self._seen = {}
def extract_args(self, args: tuple, x: Any, y: Any, expected: Any, actual: Any) -> List:
possible = []
def append_if_specified(source):
if source is not unspecified:
possible.append(source)
append_if_specified(expected)
possible.extend(args)
append_if_specified(actual)
append_if_specified(x)
append_if_specified(y)
if len(possible) != 2:
message = 'Exactly two objects needed, you supplied:'
if possible:
message += ' {}'.format(possible)
if self.options:
message += ' {}'.format(self.options)
raise TypeError(message)
return possible
def get_option(self, name: str, default=None):
return self.options.get(name, default)
def label(self, side: str, value: Any) -> str:
r = str(value)
label = getattr(self, side+'_label')
if label:
r += ' ('+label+')'
return r
def _lookup(self, x: Any, y: Any) -> Comparer:
if self.strict and type(x) is not type(y):
return compare_with_type
for class_ in _shared_mro(x, y):
for registry in self.registries:
comparer = registry.get(class_)
if comparer:
return comparer
# fallback for iterables
if ((isinstance(x, IterableABC) and isinstance(y, IterableABC)) and not
(isinstance(x, _unsafe_iterables) or
isinstance(y, _unsafe_iterables))):
return compare_generator
# special handling for Comparisons:
if isinstance(x, Comparison) or isinstance(y, Comparison):
return compare_simple
return compare_object
def _separator(self) -> str:
return '\n\nWhile comparing %s: ' % ''.join(self.breadcrumbs[1:])
def _break_loops(self, obj, breadcrumb):
# Don't bother with this process for simple, immutable types:
if isinstance(obj, IMMUTABLE_TYPEs):
return obj
id_ = id(obj)
breadcrumb_ = self._seen.get(id_)
if breadcrumb_ is not None:
return AlreadySeen(id_, obj, breadcrumb_)
else:
self._seen[id_] = breadcrumb
return obj
def different(self, x: Any, y: Any, breadcrumb: str) -> Union[bool, Optional[str]]:
x = self._break_loops(x, breadcrumb)
y = self._break_loops(y, breadcrumb)
recursed = bool(self.breadcrumbs)
self.breadcrumbs.append(breadcrumb)
existing_message = self.message
self.message = ''
current_message = ''
try:
if type(y) is AlreadySeen or not (self.strict or self.ignore_eq):
try:
if x == y:
return False
except RecursionError:
pass
comparer: Comparer = self._lookup(x, y)
result = comparer(x, y, self)
specific_comparer = comparer is not compare_simple
if result:
if specific_comparer and recursed:
current_message = self._separator()
if specific_comparer or not recursed:
current_message += result
if self.recursive:
current_message += self.message
return result
finally:
self.message = existing_message + current_message
self.breadcrumbs.pop()
def _resolve_lazy(source):
return str(source() if callable(source) else source)
unspecified = singleton('unspecified')
def compare(
*args,
x: Any = unspecified,
y: Any = unspecified,
expected: Any = unspecified,
actual: Any = unspecified,
prefix: str = None,
suffix: str = None,
x_label: str = None,
y_label: str = None,
raises: bool = True,
recursive: bool = True,
strict: bool = False,
ignore_eq: bool = False,
comparers: Registry = None,
**options: Any
) -> Optional[str]:
"""
Compare two objects, raising an :class:`AssertionError` if they are not
the same. The :class:`AssertionError` raised will attempt to provide
descriptions of the differences found.
The two objects to compare can be passed either positionally or using
explicit keyword arguments named ``x`` and ``y``, or ``expected`` and
``actual``, or a mixture of these.
:param prefix: If provided, in the event of an :class:`AssertionError`
being raised, the prefix supplied will be prepended to the
message in the :class:`AssertionError`. This may be a
callable, in which case it will only be resolved if needed.
:param suffix: If provided, in the event of an :class:`AssertionError`
being raised, the suffix supplied will be appended to the
message in the :class:`AssertionError`. This may be a
callable, in which case it will only be resolved if needed.
:param x_label: If provided, in the event of an :class:`AssertionError`
being raised, the object passed as the first positional
argument, or ``x`` keyword argument, will be labelled
with this string in the message in the
:class:`AssertionError`.
:param y_label: If provided, in the event of an :class:`AssertionError`
being raised, the object passed as the second positional
argument, or ``y`` keyword argument, will be labelled
with this string in the message in the
:class:`AssertionError`.
:param raises: If ``False``, the message that would be raised in the
:class:`AssertionError` will be returned instead of the
exception being raised.
:param recursive: If ``True``, when a difference is found in a
nested data structure, attempt to highlight the location
of the difference.
:param strict: If ``True``, objects will only compare equal if they are
of the same type as well as being equal.
:param ignore_eq: If ``True``, object equality, which relies on ``__eq__``
being correctly implemented, will not be used.
Instead, comparers will be looked up and used
and, if no suitable comparer is found, objects will
be considered equal if their hash is equal.
:param comparers: If supplied, should be a dictionary mapping
types to comparer functions for those types. These will
be added to the comparer registry for the duration
of this call.
Any other keyword parameters supplied will be passed to the functions
that end up doing the comparison. See the
:mod:`API documentation below <testfixtures.comparison>`
for details of these.
"""
__tracebackhide__ = True
if not (expected is unspecified and actual is unspecified):
x_label = x_label or 'expected'
y_label = y_label or 'actual'
context = CompareContext(x_label, y_label, recursive, strict, ignore_eq, comparers, options)
x, y = context.extract_args(args, x, y, expected, actual)
if not context.different(x, y, ''):
return
message = context.message
if prefix:
message = _resolve_lazy(prefix) + ': ' + message
if suffix:
message += '\n' + _resolve_lazy(suffix)
if raises:
raise AssertionError(message)
return message
class StatefulComparison(object):
"""
A base class for stateful comparison objects.
"""
failed: str = ''
expected: Any = None
name_attrs: Sequence[str] = ()
def __eq__(self, other):
return not(self != other)
def name(self) -> str:
name = type(self).__name__
if self.name_attrs:
name += '(%s)' % ', '.join('%s=%r' % (n, getattr(self, n)) for n in self.name_attrs)
return name
def body(self) -> str:
return pformat(self.expected)[1:-1]
def __repr__(self) -> str:
name = self.name()
body = self.failed or self.body()
prefix = '<%s%s>' % (name, self.failed and '(failed)' or '')
if '\n' in body:
return '\n'+prefix+'\n'+body.strip('\n')+'\n'+'</%s>' % name
elif body:
return prefix + body + '</>'
return prefix
class Comparison(StatefulComparison):
"""
These are used when you need to compare an object's type, a subset of its attributes
or make equality checks with objects that do not natively support comparison.
:param object_or_type: The object or class from which to create the
:class:`Comparison`.
:param attribute_dict: An optional dictionary containing attributes
to place on the :class:`Comparison`.
:param partial:
If true, only the specified attributes will be checked and any extra attributes
of the object being compared with will be ignored.
:param attributes: Any other keyword parameters passed will placed
as attributes on the :class:`Comparison`.
"""
def __init__(self,
object_or_type,
attribute_dict: Dict[str, Any] = None,
partial: bool = False,
**attributes: Any):
self.partial = partial
if attributes:
if attribute_dict is None:
attribute_dict = attributes
else:
attribute_dict.update(attributes)
if isinstance(object_or_type, str):
c = resolve(object_or_type).found
if c is not_there:
raise AttributeError(
'%r could not be resolved' % object_or_type
)
elif isinstance(object_or_type, type):
c = object_or_type
else:
c = object_or_type.__class__
if attribute_dict is None:
attribute_dict = _extract_attrs(object_or_type)
self.expected_type = c
self.expected_attributes = attribute_dict
def __ne__(self, other: Any) -> bool:
if self.expected_type is not other.__class__:
self.failed = 'wrong type'
return True
if self.expected_attributes is None:
return False
attribute_names = set(self.expected_attributes.keys())
if self.partial:
actual_attributes = {}
else:
actual_attributes = _extract_attrs(other)
attribute_names -= set(actual_attributes)
for name in attribute_names:
try:
actual_attributes[name] = getattr(other, name)
except AttributeError:
pass
context = CompareContext(x_label='Comparison', y_label='actual')
self.failed = _compare_mapping(self.expected_attributes,
actual_attributes,
context,
obj_for_class=not_there,
prefix='attributes ',
breadcrumb='.%s',
check_y_not_x=not self.partial)
return bool(self.failed)
def name(self) -> str:
name = 'C:'
module = getattr(self.expected_type, '__module__', None)
if module:
name = name + module + '.'
name += (getattr(self.expected_type, '__name__', None) or repr(self.expected_type))
return name
def body(self) -> str:
if self.expected_attributes:
# if we're not failed, show what we will expect:
lines = []
for k, v in sorted(self.expected_attributes.items()):
rv = repr(v)
if '\n' in rv:
rv = indent(rv)
lines.append('%s: %s' % (k, rv))
return '\n'.join(lines)
return ''
class SequenceComparison(StatefulComparison):
"""
An object that can be used in comparisons of expected and actual
sequences.
:param expected: The items expected to be in the sequence.
:param ordered:
If ``True``, then the items are expected to be in the order specified.
If ``False``, they may be in any order.
Defaults to ``True``.
:param partial:
If ``True``, then any keys not expected will be ignored.
Defaults to ``False``.
:param recursive:
If a difference is found, recursively compare the item where
the difference was found to highlight exactly what was different.
Defaults to ``False``.
"""
name_attrs = ('ordered', 'partial')
def __init__(
self, *expected, ordered: bool = True, partial: bool = False, recursive: bool = False
):
self.expected = expected
self.ordered = ordered
self.partial = partial
self.recursive = recursive
self.checked_indices = set()
def __ne__(self, other) -> bool:
try:
actual = original_actual = list(other)
except TypeError:
self.failed = 'bad type'
return True
expected = list(self.expected)
actual = list(actual)
matched = []
matched_expected_indices = []
matched_actual_indices = []
missing_from_expected = actual
missing_from_expected_indices = actual_indices = list(range(len(actual)))
missing_from_actual = []
missing_from_actual_indices = []
start = 0
for e_i, e in enumerate(expected):
try:
i = actual.index(e, start)
a_i = actual_indices.pop(i)
except ValueError:
missing_from_actual.append(e)
missing_from_actual_indices.append(e_i)
else:
matched.append(missing_from_expected.pop(i))
matched_expected_indices.append(e_i)
matched_actual_indices.append(a_i)
self.checked_indices.add(a_i)
if self.ordered:
start = i
matches_in_order = matched_actual_indices == sorted(matched_actual_indices)
all_matched = not (missing_from_actual or missing_from_expected)
partial_match = self.partial and not missing_from_actual
if (matches_in_order or not self.ordered) and (all_matched or partial_match):
return False
expected_indices = matched_expected_indices+missing_from_actual_indices
actual_indices = matched_actual_indices
if self.partial:
# try to give a clue as to what didn't match:
if self.recursive and self.ordered and missing_from_expected:
actual_indices.append(missing_from_expected_indices.pop(0))
missing_from_expected.pop(0)
ignored = missing_from_expected
missing_from_expected = None
else:
actual_indices += missing_from_expected_indices
ignored = None
message = []
def add_section(name, content):
if content:
message.append(name+':\n'+pformat(content))
add_section('ignored', ignored)
if self.ordered:
message.append(compare(
expected=[self.expected[i] for i in sorted(expected_indices)],
actual=[original_actual[i] for i in sorted(actual_indices)],
recursive=self.recursive,
raises=False
).split('\n\n', 1)[1])
else:
add_section('same', matched)
add_section('in expected but not actual', missing_from_actual)
add_section('in actual but not expected', missing_from_expected)
self.failed = '\n\n'.join(message)
return True
class Subset(SequenceComparison):
"""
A shortcut for :class:`SequenceComparison` that checks if the
specified items are present in the sequence.
"""
name_attrs = ()
def __init__(self, *expected):
super(Subset, self).__init__(*expected, ordered=False, partial=True)
class Permutation(SequenceComparison):
"""
A shortcut for :class:`SequenceComparison` that checks if the set of items
in the sequence is as expected, but without checking ordering.
"""
def __init__(self, *expected):
super(Permutation, self).__init__(*expected, ordered=False, partial=False)
class MappingComparison(StatefulComparison):
"""
An object that can be used in comparisons of expected and actual
mappings.
:param expected_mapping:
The mapping that should be matched expressed as either a sequence of
``(key, value)`` tuples or a mapping.
:param expected_items: The items that should be matched.
:param ordered:
If ``True``, then the keys in the mapping are expected to be in the order specified.
Defaults to ``False``.
:param partial:
If ``True``, then any keys not expected will be ignored.
Defaults to ``False``.
:param recursive:
If a difference is found, recursively compare the value where
the difference was found to highlight exactly what was different.
Defaults to ``False``.
"""
name_attrs = ('ordered', 'partial')
def __init__(self, *expected_mapping, **expected_items):
# py2 :-(
self.ordered = expected_items.pop('ordered', False)
self.partial = expected_items.pop('partial', False)
self.recursive = expected_items.pop('recursive', False)
if len(expected_mapping) == 1:
expected = OrderedDict(*expected_mapping)
else:
expected = OrderedDict(expected_mapping)
expected.update(expected_items)
self.expected = expected
def body(self) -> str:
# this can all go away and use the super class once py2 is gone :'(
parts = []
text_length = 0
for key, value in self.expected.items():
part = repr(key)+': '+pformat(value)
text_length += len(part)
parts.append(part)
if text_length > 60:
sep = ',\n'
else:
sep = ', '
return sep.join(parts)
def __ne__(self, other) -> bool:
try:
actual_keys = other.keys()
actual_mapping = dict(other.items())
except AttributeError:
self.failed = 'bad type'
return True
expected_keys = self.expected.keys()
expected_mapping = self.expected
if self.partial:
ignored_keys = set(actual_keys) - set(expected_keys)
for key in ignored_keys:
del actual_mapping[key]
# preserve the order:
actual_keys = [k for k in actual_keys if k not in ignored_keys]
else:
ignored_keys = None
mapping_differences = compare(
expected=expected_mapping,
actual=actual_mapping,
recursive=self.recursive,
raises=False
)
if self.ordered:
key_differences = compare(
expected=list(expected_keys),
actual=list(actual_keys),
recursive=self.recursive,
raises=False
)
else:
key_differences = None
if key_differences or mapping_differences:
message = []
if ignored_keys:
message.append('ignored:\n'+pformat(sorted(ignored_keys)))
if mapping_differences:
message.append(mapping_differences.split('\n\n', 1)[1])
if key_differences:
message.append('wrong key order:\n\n'+key_differences.split('\n\n', 1)[1])
self.failed = '\n\n'.join(message)
return True
return False
class StringComparison:
"""
An object that can be used in comparisons of expected and actual
strings where the string expected matches a pattern rather than a
specific concrete string.
:param regex_source: A string containing the source for a regular
expression that will be used whenever this
:class:`StringComparison` is compared with
any :class:`str` instance.
:param flags: Flags passed to :func:`re.compile`.
:param flag_names: See the :ref:`examples <stringcomparison>`.
"""
def __init__(self, regex_source: str, flags: int = None, **flag_names: str):
args = [regex_source]
flags_ = []
if flags:
flags_.append(flags)
flags_.extend(getattr(re, f.upper()) for f in flag_names)
if flags_:
args.append(reduce(__or__, flags_))
self.re = re.compile(*args)
def __eq__(self, other) -> bool:
if not isinstance(other, str):
return False
if self.re.match(other):
return True
return False
def __ne__(self, other) -> bool:
return not self == other
def __repr__(self) -> str:
return '<S:%s>' % self.re.pattern
def __lt__(self, other) -> bool:
return self.re.pattern < other
def __gt__(self, other) -> bool:
return self.re.pattern > other
class RoundComparison:
"""
An object that can be used in comparisons of expected and actual
numerics to a specified precision.
:param value: numeric to be compared.
:param precision: Number of decimal places to round to in order
to perform the comparison.
"""
def __init__(self, value: float, precision: int):
self.rounded = round(value, precision)
self.precision = precision
def __eq__(self, other) -> bool:
other_rounded = round(other, self.precision)
if type(self.rounded) is not type(other_rounded):
raise TypeError('Cannot compare %r with %r' % (self, type(other)))
return self.rounded == other_rounded
def __ne__(self, other) -> bool:
return not self == other
def __repr__(self) -> str:
return '<R:%s to %i digits>' % (self.rounded, self.precision)
class RangeComparison:
"""
An object that can be used in comparisons of orderable types to
check that a value specified within the given range.
:param lower_bound: the inclusive lower bound for the acceptable range.
:param upper_bound: the inclusive upper bound for the acceptable range.
"""
def __init__(self, lower_bound, upper_bound):
self.lower_bound = lower_bound
self.upper_bound = upper_bound
def __eq__(self, other) -> bool:
return self.lower_bound <= other <= self.upper_bound
def __ne__(self, other) -> bool:
return not self == other
def __repr__(self) -> str:
return '<Range: [%s, %s]>' % (self.lower_bound, self.upper_bound)