Question about pip in test_new_resolver.py

OhMyBuggg · December 8, 2020, 8:40am

In the test file: pip/tests/functional/test_new_resolver.py::test_new_resolver_requires_python (line 349)

I am now studying about pip code. But I have no idea what this test is used for.
For the test “Something impossible to satisfy”, is it ture that we still got the original answer?

uranusjr · December 8, 2020, 1:36pm

test_new_resolver_requires_python ensures the resolver checks the Requires-Python Core Metadata field, and reject a version if its Requires-Python is not compatible with the currently-used Python version.

The “something impossible to satisfy” fixture provides Requires-Python: <2 i.e. requires Python 1.x or earlier, which is impossible to satisfy for any environments running the test (since pip itself requires 2.7+), to generate a package version that must be rejected by the resolver.

p.s. For covinience, the relevent code is

github.com

pypa/pip/blob/643217bc35cbd26e24ac5e35466f8b7d7d0ed9fb/tests/functional/test_new_resolver.py#L337-L385


@pytest.mark.parametrize(
    "requires_python, ignore_requires_python, dep_version",
    [
        # Something impossible to satisfy.
        ("<2", False, "0.1.0"),
        ("<2", True, "0.2.0"),
        # Something guaranteed to satisfy.
        (">=2", False, "0.2.0"),
        (">=2", True, "0.2.0"),
    ],
)
def test_new_resolver_requires_python(
    script,
    requires_python,
    ignore_requires_python,
    dep_version,
):
    create_basic_wheel_for_package(
        script,

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