@Before
    public void setUp() {
        ready = new AtomicBoolean(false);
    }
Subclasses should return an instance of {@link W} that sets {@code ready} to {@code true},
if the wait was successful.

@param ready the AtomicBoolean on which to indicate success
@return WaitStrategy implementation
core/src/test/java/org/testcontainers/junit/wait/strategy/AbstractWaitStrategyTest.java