@Test
	public void testHttpFileSink() {
		genericTest(sinks.file());
	}
Listens for data via the http source and outputs the data to a file sink. The file is checked to see if it
contains the exact data. If exact the test is successful. Else an assertion is thrown.
spring-xd-integration-test/src/test/java/org/springframework/xd/integration/test/HttpTest.java