Coverage for src/pytest_cases/case_funcs.py: 89%
115 statements
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1# Authors: Sylvain MARIE <sylvain.marie@se.com>
2# + All contributors to <https://github.com/smarie/python-pytest-cases>
3#
4# License: 3-clause BSD, <https://github.com/smarie/python-pytest-cases/blob/master/LICENSE>
5from copy import copy
6from decopatch import function_decorator, DECORATED
8try: # python 3.5+
9 from typing import Callable, Union, Optional, Any, Tuple, Iterable, List, Set
10except ImportError:
11 pass
13from .common_mini_six import string_types
14from .common_pytest import safe_isclass
15from .common_pytest_marks import get_pytest_marks_on_function, markdecorators_as_tuple, markdecorators_to_markinfos
17try:
18 from _pytest.mark.structures import MarkDecorator, Mark
19except ImportError:
20 pass
23# ------------------ API --------------
24CASE_PREFIX_CLS = 'Case'
25"""Prefix used by default to identify case classes"""
27CASE_PREFIX_FUN = 'case_'
28"""Prefix used by default to identify case functions within a module"""
31CASE_FIELD = '_pytestcase'
34class _CaseInfo(object):
35 """
36 Contains all information available about a case.
37 It is attached to a case function as an attribute.
39 Currently we do not wish to export an object-oriented API for this but rather a set of functions.
40 This is why this class remains private. Public functions to access the various elements in this class
41 are provided below (`get_case_id`, `get_case_tags` and `get_case_marks`). This is a safeguard to allow us
42 to change this class design later while easily guaranteeing retrocompatibility.
43 """
44 __slots__ = ('id', 'marks', 'tags')
46 def __init__(self,
47 id=None, # type: str
48 marks=(), # type: Tuple[MarkDecorator, ...]
49 tags=() # type: Tuple[Any]
50 ):
51 self.id = id
52 self.marks = marks # type: Tuple[MarkDecorator, ...]
53 self.tags = ()
54 self.add_tags(tags)
56 def __repr__(self):
57 return "_CaseInfo(id=%r,marks=%r,tags=%r)" % (self.id, self.marks, self.tags)
59 @classmethod
60 def get_from(cls,
61 case_func, # type: Callable
62 create_if_missing=False # type: bool
63 ):
64 """ Return the _CaseInfo associated with case_fun or None
66 :param case_func:
67 :param create_if_missing: if no case information is present on the function, by default None is returned. If
68 this flag is set to True, a new _CaseInfo will be created and attached on the function, and returned.
69 """
70 ci = getattr(case_func, CASE_FIELD, None)
71 if ci is None and create_if_missing: 71 ↛ 72line 71 didn't jump to line 72, because the condition on line 71 was never true
72 ci = cls()
73 ci.attach_to(case_func)
74 return ci
76 def attach_to(self,
77 case_func # type: Callable
78 ):
79 """attach this case_info to the given case function"""
80 setattr(case_func, CASE_FIELD, self)
82 def add_tags(self,
83 tags # type: Union[Any, Union[List, Set, Tuple]]
84 ):
85 """add the given tag or tags"""
86 if tags:
87 if isinstance(tags, string_types) or not isinstance(tags, (set, list, tuple)):
88 # a single tag, create a tuple around it
89 tags = (tags,)
91 self.tags += tuple(tags)
93 def matches_tag_query(self,
94 has_tag=None, # type: Union[str, Iterable[str]]
95 ):
96 """
97 Returns True if the case function with this case_info is selected by the query
99 :param has_tag:
100 :return:
101 """
102 return _tags_match_query(self.tags, has_tag)
104 @classmethod
105 def copy_info(cls,
106 from_case_func,
107 to_case_func):
108 case_info = cls.get_from(from_case_func)
109 if case_info is not None:
110 # there is something to copy: do it
111 cp = copy(case_info)
112 cp.attach_to(to_case_func)
115def _tags_match_query(tags, # type: Iterable[str]
116 has_tag # type: Optional[Union[str, Iterable[str]]]
117 ):
118 """Internal routine to determine is all tags in `has_tag` are persent in `tags`
119 Note that `has_tag` can be a single tag, or none
120 """
121 if has_tag is None: 121 ↛ 122line 121 didn't jump to line 122, because the condition on line 121 was never true
122 return True
124 if not isinstance(has_tag, (tuple, list, set)):
125 has_tag = (has_tag,)
127 return all(t in tags for t in has_tag)
130def copy_case_info(from_fun, # type: Callable
131 to_fun # type: Callable
132 ):
133 """Copy all information from case function `from_fun` to `to_fun`."""
134 _CaseInfo.copy_info(from_fun, to_fun)
137def set_case_id(id, # type: str
138 case_func # type: Callable
139 ):
140 """Set an explicit id on case function `case_func`."""
141 ci = _CaseInfo.get_from(case_func, create_if_missing=True)
142 ci.id = id
145def get_case_id(case_func, # type: Callable
146 prefix_for_default_ids=CASE_PREFIX_FUN # type: str
147 ):
148 """Return the case id associated with this case function.
150 If a custom id is not present, a case id is automatically created from the function name based on removing the
151 provided prefix if present at the beginning of the function name. If the resulting case id is empty,
152 "<empty_case_id>" will be returned.
154 :param case_func: the case function to get a case id for
155 :param prefix_for_default_ids: this prefix that will be removed if present on the function name to form the default
156 case id.
157 :return:
158 """
159 _ci = _CaseInfo.get_from(case_func)
160 _id = _ci.id if _ci is not None else None
162 if _id is None:
163 # default case id from function name based on prefix
164 if case_func.__name__.startswith(prefix_for_default_ids):
165 _id = case_func.__name__[len(prefix_for_default_ids):]
166 else:
167 _id = case_func.__name__
169 # default case id for empty id
170 if len(_id) == 0:
171 _id = "<empty_case_id>"
173 return _id
176# def add_case_marks: no need, equivalent of @case(marks) or @mark
179def get_case_marks(case_func, # type: Callable
180 concatenate_with_fun_marks=False, # type: bool
181 as_decorators=False # type: bool
182 ):
183 # type: (...) -> Union[Tuple[Mark, ...], Tuple[MarkDecorator, ...]]
184 """Return the marks that are on the case function.
186 There are currently two ways to place a mark on a case function: either with `@pytest.mark.<name>` or in
187 `@case(marks=...)`. This function returns a list of marks containing either both (if `concatenate_with_fun_marks` is
188 `True`) or only the ones set with `@case` (`concatenate_with_fun_marks` is `False`, default).
190 :param case_func: the case function
191 :param concatenate_with_fun_marks: if `False` (default) only the marks declared in `@case` will be returned.
192 Otherwise a concatenation of marks in `@case` and on the function (for example directly with
193 `@pytest.mark.<name>`) will be returned.
194 :param as_decorators: when `True`, the marks (`MarkInfo`) will be transformed into `MarkDecorators` before being
195 returned. Otherwise (default) the marks are returned as is.
196 :return:
197 """
198 _ci = _CaseInfo.get_from(case_func)
199 if _ci is None:
200 _ci_marks = None
201 else:
202 # convert the MarkDecorators to Marks if needed
203 _ci_marks = _ci.marks if as_decorators else markdecorators_to_markinfos(_ci.marks)
205 if not concatenate_with_fun_marks:
206 return _ci_marks
207 else:
208 # concatenate the marks on the `_CaseInfo` with the ones on `case_func`
209 fun_marks = tuple(get_pytest_marks_on_function(case_func, as_decorators=as_decorators))
210 return (_ci_marks + fun_marks) if _ci_marks else fun_marks
213# def add_case_tags(case_func,
214# tags
215# ):
216# """Adds tags on the case function, for filtering. This is equivalent to `@case(tags=...)(case_func)`"""
217# ci = _CaseInfo.get_from(case_func, create_if_missing=True)
218# ci.add_tags(tags)
221def get_case_tags(case_func # type: Callable
222 ):
223 """Return the tags on this case function or an empty tuple"""
224 ci = _CaseInfo.get_from(case_func)
225 return ci.tags if ci is not None else ()
228def matches_tag_query(case_fun, # type: Callable
229 has_tag=None, # type: Union[str, Iterable[str]]
230 filter=None, # type: Union[Callable[[Callable], bool], Iterable[Callable[[Callable], bool]]] # noqa
231 ):
232 """
233 This function is the one used by `@parametrize_with_cases` to filter the case functions collected. It can be used
234 manually for tests/debug.
236 Returns True if the case function is selected by the query:
238 - if `has_tag` contains one or several tags, they should ALL be present in the tags
239 set on `case_fun` (`get_case_tags`)
241 - if `filter` contains one or several filter callables, they are all called in sequence and the
242 `case_fun` is only selected if ALL of them return a `True` truth value
244 :param case_fun: the case function
245 :param has_tag: one or several tags that should ALL be present in the tags set on `case_fun` for it to be selected.
246 :param filter: one or several filter callables that will be called in sequence. If all of them return a `True`
247 truth value, `case_fun` is selected.
248 :return: True if the case_fun is selected by the query.
249 """
250 selected = True
252 # query on tags
253 if has_tag is not None:
254 selected = selected and _tags_match_query(get_case_tags(case_fun), has_tag)
256 # filter function
257 if filter is not None: 257 ↛ 275line 257 didn't jump to line 275, because the condition on line 257 was never false
258 if not isinstance(filter, (tuple, set, list)): 258 ↛ 259line 258 didn't jump to line 259, because the condition on line 258 was never true
259 filter = (filter,)
261 for _filter in filter:
262 # break if already unselected
263 if not selected: 263 ↛ 264line 263 didn't jump to line 264, because the condition on line 263 was never true
264 return selected
266 # try next filter
267 try:
268 res = _filter(case_fun)
269 # keep this in the try catch in case there is an issue with the truth value of result
270 selected = selected and res
271 except: # noqa
272 # any error leads to a no-match
273 selected = False
275 return selected
278try:
279 SeveralMarkDecorators = Union[Tuple[MarkDecorator, ...], List[MarkDecorator], Set[MarkDecorator]]
280except: # noqa
281 pass
284@function_decorator
285def case(id=None, # type: str # noqa
286 tags=None, # type: Union[Any, Iterable[Any]]
287 marks=(), # type: Union[MarkDecorator, SeveralMarkDecorators]
288 case_func=DECORATED # noqa
289 ):
290 """
291 Optional decorator for case functions so as to customize some information.
293 ```python
294 @case(id='hey')
295 def case_hi():
296 return 1
297 ```
299 :param id: the custom pytest id that should be used when this case is active. Replaces the deprecated `@case_name`
300 decorator from v1. If no id is provided, the id is generated from case functions by removing their prefix,
301 see `@parametrize_with_cases(prefix='case_')`.
302 :param tags: custom tags to be used for filtering in `@parametrize_with_cases(has_tags)`. Replaces the deprecated
303 `@case_tags` and `@target` decorators.
304 :param marks: optional pytest marks to add on the case. Note that decorating the function directly with the mark
305 also works, and if marks are provided in both places they are merged.
306 :return:
307 """
308 marks = markdecorators_as_tuple(marks)
309 case_info = _CaseInfo(id, marks, tags)
310 case_info.attach_to(case_func)
311 return case_func
314def is_case_class(cls, # type: Any
315 case_marker_in_name=CASE_PREFIX_CLS, # type: str
316 check_name=True # type: bool
317 ):
318 """
319 This function is the one used by `@parametrize_with_cases` to collect cases within classes. It can be used manually
320 for tests/debug.
322 Returns True if the given object is a class and, if `check_name=True` (default), if its name contains
323 `case_marker_in_name`.
325 :param cls: the object to check
326 :param case_marker_in_name: the string that should be present in a class name so that it is selected. Default is
327 'Case'.
328 :param check_name: a boolean (default True) to enforce that the name contains the word `case_marker_in_name`.
329 If False, any class will lead to a `True` result whatever its name.
330 :return: True if this is a case class
331 """
332 return safe_isclass(cls) and (not check_name or case_marker_in_name in cls.__name__)
335GEN_BY_US = '_pytestcases_gen'
338def is_case_function(f, # type: Any
339 prefix=CASE_PREFIX_FUN, # type: str
340 check_prefix=True # type: bool
341 ):
342 """
343 This function is the one used by `@parametrize_with_cases` to collect cases. It can be used manually for
344 tests/debug.
346 Returns True if the provided object is a function or callable and, if `check_prefix=True` (default), if it starts
347 with `prefix`.
349 :param f: the object to check
350 :param prefix: the string that should be present at the beginning of a function name so that it is selected.
351 Default is 'case_'.
352 :param check_prefix: if this boolean is True (default), the prefix will be checked. If False, any function will
353 lead to a `True` result whatever its name.
354 :return:
355 """
356 if not callable(f):
357 return False
358 elif safe_isclass(f):
359 return False
360 elif hasattr(f, GEN_BY_US):
361 # a function generated by us. ignore this
362 return False
363 else:
364 try:
365 return f.__name__.startswith(prefix) if check_prefix else True
366 except:
367 # GH#287: safe fallback
368 return False