Some statements can be simplified for readability

[hamirmahal]

We can replace lines like

assert!(engine.check_network_request(&request).matched == *expectation,
    "Expected match = {} for {} from {} typed {} against {:?}", expectation, url, source_url, request_type, rules)

with

assert!(engine.check_network_request(&request).matched == *expectation,
    "Expected match = {expectation} for {url} from {source_url} typed {request_type} against {rules:?}")

to improve code readability and developer productivity.