completes top-level property
Matches a Future that completes successfully with any value.
This creates an asynchronous expectation. The call to expect
will return
immediately and execution will continue. To wait for the future to
complete and the expectation to run use expectLater
and wait on the
returned future.
To test that a Future completes with an exception, you can use throws and throwsA.
Implementation
final Matcher completes = const _Completes(null);