Macro assert_pred

macro_rules! assert_pred {
    ($content:expr $(,)?) => { ... };
    ($content:expr $(,)?, $($format_args:expr),* $(,)?) => { ... };
}

Asserts that the given predicate applied to the given arguments returns true, panicking if it does not.

One may optionally add arguments which will be formatted and appended to a failure message. For example:

    let extra_information = "Some additional information";
    assert_pred!(1 == 2, "Test failed. Extra information: {extra_information}.");

The output is as follows:

1 == 2 was false with
Test failed. Extra information: Some additional information.

Note for users of GoogleTest for C++: This differs from the ASSERT_PRED* family of macros in that it panics rather than triggering an early return from the invoking function. To get behaviour equivalent to ASSERT_PRED*, use verify_pred! with the ? operator.