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[etc/vim.git] / tests / optional.py
1 """
2 Allows configuring optional test markers in config, see pyproject.toml.
3
4 Run optional tests with `pytest --run-optional=...`.
5
6 Mark tests to run only if an optional test ISN'T selected by prepending the mark with
7 "no_".
8
9 You can specify a "no_" prefix straight in config, in which case you can mark tests
10 to run when this tests ISN'T selected by omitting the "no_" prefix.
11
12 Specifying the name of the default behavior in `--run-optional=` is harmless.
13
14 Adapted from https://pypi.org/project/pytest-optional-tests/, (c) 2019 Reece Hart
15 """
16
17 import itertools
18 import logging
19 import re
20 from functools import lru_cache
21 from typing import TYPE_CHECKING, FrozenSet, List, Set
22
23 import pytest
24
25 try:
26     from pytest import StashKey
27 except ImportError:
28     # pytest < 7
29     from _pytest.store import StoreKey as StashKey  # type: ignore[no-redef]
30
31 log = logging.getLogger(__name__)
32
33
34 if TYPE_CHECKING:
35     from _pytest.config import Config
36     from _pytest.config.argparsing import Parser
37     from _pytest.mark.structures import MarkDecorator
38     from _pytest.nodes import Node
39
40
41 ALL_POSSIBLE_OPTIONAL_MARKERS = StashKey[FrozenSet[str]]()
42 ENABLED_OPTIONAL_MARKERS = StashKey[FrozenSet[str]]()
43
44
45 def pytest_addoption(parser: "Parser") -> None:
46     group = parser.getgroup("collect")
47     group.addoption(
48         "--run-optional",
49         action="append",
50         dest="run_optional",
51         default=None,
52         help="Optional test markers to run; comma-separated",
53     )
54     parser.addini("optional-tests", "List of optional tests markers", "linelist")
55
56
57 def pytest_configure(config: "Config") -> None:
58     """Optional tests are markers.
59
60     Use the syntax in https://docs.pytest.org/en/stable/mark.html#registering-marks.
61     """
62     ot_ini = config.inicfg.get("optional-tests") or []
63     ot_markers = set()
64     ot_run: Set[str] = set()
65     if isinstance(ot_ini, str):
66         ot_ini = ot_ini.strip().split("\n")
67     marker_re = re.compile(r"^\s*(?P<no>no_)?(?P<marker>\w+)(:\s*(?P<description>.*))?")
68     for ot in ot_ini:
69         m = marker_re.match(ot)
70         if not m:
71             raise ValueError(f"{ot!r} doesn't match pytest marker syntax")
72
73         marker = (m.group("no") or "") + m.group("marker")
74         description = m.group("description")
75         config.addinivalue_line("markers", f"{marker}: {description}")
76         config.addinivalue_line(
77             "markers", f"{no(marker)}: run when `{marker}` not passed"
78         )
79         ot_markers.add(marker)
80
81     # collect requested optional tests
82     passed_args = config.getoption("run_optional")
83     if passed_args:
84         ot_run.update(itertools.chain.from_iterable(a.split(",") for a in passed_args))
85     ot_run |= {no(excluded) for excluded in ot_markers - ot_run}
86     ot_markers |= {no(m) for m in ot_markers}
87
88     log.info("optional tests to run:", ot_run)
89     unknown_tests = ot_run - ot_markers
90     if unknown_tests:
91         raise ValueError(f"Unknown optional tests wanted: {unknown_tests!r}")
92
93     store = config._store
94     store[ALL_POSSIBLE_OPTIONAL_MARKERS] = frozenset(ot_markers)
95     store[ENABLED_OPTIONAL_MARKERS] = frozenset(ot_run)
96
97
98 def pytest_collection_modifyitems(config: "Config", items: "List[Node]") -> None:
99     store = config._store
100     all_possible_optional_markers = store[ALL_POSSIBLE_OPTIONAL_MARKERS]
101     enabled_optional_markers = store[ENABLED_OPTIONAL_MARKERS]
102
103     for item in items:
104         all_markers_on_test = {m.name for m in item.iter_markers()}
105         optional_markers_on_test = all_markers_on_test & all_possible_optional_markers
106         if not optional_markers_on_test or (
107             optional_markers_on_test & enabled_optional_markers
108         ):
109             continue
110         log.info("skipping non-requested optional", item)
111         item.add_marker(skip_mark(frozenset(optional_markers_on_test)))
112
113
114 @lru_cache()
115 def skip_mark(tests: FrozenSet[str]) -> "MarkDecorator":
116     names = ", ".join(sorted(tests))
117     return pytest.mark.skip(reason=f"Marked with disabled optional tests ({names})")
118
119
120 @lru_cache()
121 def no(name: str) -> str:
122     if name.startswith("no_"):
123         return name[len("no_") :]
124     return "no_" + name