Add feature `assert_message` to `RunningContainer` available in the test body.
Implement a method to assert that a message has appeared in the log stream of a RunningContainer
.
Example:
let mut test = DockerTest::new();
let composition = Composition::with_repository("dockertest-rs/hello");
test.add_composition(composition);
test.run(|ops| async move {
let hello = ops.handle("dockertest-rs/hello");
hello.assert_message("hello dockertest-rs", MessageSource::Stdout, 5).await;
});
Edited by Vegard Sandengen