when method
Starts preparing the answer to method requests for path; finish
it with one of the methods of the returned MockResponseBuilder.
path is a path (/books/1, any host matches) or a full URL
(https://api.neon.books/books/1, scheme, host and port must match).
A trailing / does not matter. Without a ? any query matches; with
one (/books?q=dune) the query must have exactly the same parameters
and values.
Implementation
MockResponseBuilder when(HttpMethod method, String path) {
final expectation = _Expectation(method, path);
_expectations.add(expectation);
return MockResponseBuilder._(expectation);
}