Function expected_skip_reason 

pub fn expected_skip_reason(
    suite: &TestSuiteFixture,
    test: &TestCaseFixture,
    properties: RunProperties,
) -> Option<SkipReason>

Determines the reason a test should be skipped.

The general algorithm is:

• If the suite is not part of the run, produce SuiteNotInRun.
• If this is a benchmark run and the test is not a benchmark, produce NotBenchmark.
• Otherwise, check that the test is filtered out.
• Otherwise, check that the test is ignored.
• Otherwise, produce None.

This assigns every skip reason that is derivable from the fixture model and the run properties. The verifier in the integration-tests crate assigns the rest: RerunAlreadyPassed depends on the outcome of a prior run, and the not-in-name-list Filtered case depends on the name set a specific check was asked to verify.