Macro diagnostics_assertions::assert_json_diff

macro_rules! assert_json_diff {
    ($diagnostics_hierarchy:expr, $($rest:tt)+) => { ... };
}

Macro to check a hierarchy with a nice JSON diff. The syntax of the expected value is the same as that of hierarchy!, and essentially the same as assert_data_tree!, except that partial tree matching is not supported (i.e. the keyword contains).