private EventuallyMatcher<String> fileUpdated(long startTime) {
		return new EventuallyMatcher<String>(new FileContentMatcher(startTime));
	}
Wrap a {@link FileContentMatcher} in an {@link EventuallyMatcher}.

@param startTime the approximate start time of the test
@return matcher for the expected file
spring-xd-distributed-test/src/test/java/org/springframework/xd/distributed/test/JobStateTests.java