Macro dfir_expect_warnings 

macro_rules! dfir_expect_warnings {
    (
        $hf:tt,
        $( ( $msg:literal, $line:literal : $column:literal ) ),*
        $( , )?
    ) => { ... };
}

Tests that the given warnings are emitted by the dfir macro invocation.

For example usage, see dfir/tests/surface_warnings.rs.