AndWait Matcher

Hamcrest matcher which is waiting (with a timeout) for the expected value

Usage

    assertThat(this::receiveMessage, andWait(is(equalTo("Howdy"))));

• this matcher works with the default hamcrest "assertThat"
• first parameter receives a function that will be called until the expected value is present (Success) or timeout (Exception) is received
• you can define a custom timeout by using the second optional parameter of the "andWait" matcher

    assertThat(this::receiveMessage, andWait(is(equalTo("Howdy")), 500));

Matcher assertionError example

    Expected:
         but: [Timeout]
    Expected: is "unknown message"
         but: was "other message"

TODO

• Feature instead of Thread.sleep(XY)
• Only one AssertionError description instead of having two descriptions - first is a timeout and second is mismatch