Macro assert_equivalent_violations 

macro_rules! assert_equivalent_violations {
    ($left:expr, $right:expr $(,)?) => { ... };
    ($left:expr, $right:expr, $($arg:tt)+) => { ... };
}

Equivalence for Violations is not supported due to its tree structure of having children violations. This macro can be used for comparing if two violations are equal and uses flattened_violations for the comparison.