I just ran a set of tests I have been developing.

All of a sudden I start getting a summary like this:

Summary [   0.598s] 26/28 tests run: 24 passed, 2 failed, 0 skipped

More specifically I comment out enough tests to get a “straight number” of tests run. This is the report:

Summary [   0.588s] 27 tests run: 26 passed, 1 failed, 0 skipped

Then I add this test to mod tests:

#[test]
fn do_test() -> Result<()> {
    assert!(false);
    Ok(())
}

The report I now get is:

Summary [   0.607s] 26/28 tests run: 24 passed, 2 failed, 0 skipped

“2 failed”: seems sensible. But more difficult: it’s telling me 2 fewer tests actually passed. Equally puzzling, all of a sudden it’s “unsure” how many tests have been run.

A significant fact could possibly be that I’m using the crate mockall here, including directive #[double].

Can anyone explain what’s going on and where in nextest documentation this may be explained?