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89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
"""Configuration for unit tests."""
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from collections.abc import Sequence
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from importlib import util
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import pytest
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def pytest_addoption(parser: pytest.Parser) -> None:
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"""Add custom command line options to pytest."""
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parser.addoption(
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"--only-extended",
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action="store_true",
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help="Only run extended tests. Does not allow skipping any extended tests.",
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)
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parser.addoption(
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"--only-core",
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action="store_true",
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help="Only run core tests. Never runs any extended tests.",
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)
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def pytest_collection_modifyitems(
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config: pytest.Config, items: Sequence[pytest.Function]
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) -> None:
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"""Add implementations for handling custom markers.
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At the moment, this adds support for a custom `requires` marker.
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The `requires` marker is used to denote tests that require one or more packages
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to be installed to run. If the package is not installed, the test is skipped.
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The `requires` marker syntax is:
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.. code-block:: python
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@pytest.mark.requires("package1", "package2")
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def test_something():
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...
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"""
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# Mapping from the name of a package to whether it is installed or not.
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# Used to avoid repeated calls to `util.find_spec`
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required_pkgs_info: dict[str, bool] = {}
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only_extended = config.getoption("--only-extended") or False
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only_core = config.getoption("--only-core") or False
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if only_extended and only_core:
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msg = "Cannot specify both `--only-extended` and `--only-core`."
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raise ValueError(msg)
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for item in items:
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requires_marker = item.get_closest_marker("requires")
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if requires_marker is not None:
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if only_core:
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item.add_marker(pytest.mark.skip(reason="Skipping not a core test."))
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continue
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# Iterate through the list of required packages
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required_pkgs = requires_marker.args
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for pkg in required_pkgs:
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# If we haven't yet checked whether the pkg is installed
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# let's check it and store the result.
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if pkg not in required_pkgs_info:
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try:
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installed = util.find_spec(pkg) is not None
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except (ImportError, ValueError):
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installed = False
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required_pkgs_info[pkg] = installed
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if not required_pkgs_info[pkg]:
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if only_extended:
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pytest.fail(
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f"Package `{pkg}` is not installed but is required for "
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f"extended tests. Please install the given package and "
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f"try again.",
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)
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else:
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# If the package is not installed, we immediately break
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# and mark the test as skipped.
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item.add_marker(
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pytest.mark.skip(reason=f"Requires pkg: `{pkg}`")
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)
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break
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elif only_extended:
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item.add_marker(pytest.mark.skip(reason="Skipping not an extended test."))
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