@Test
    void requireThatIsEmptyWorksAsExpected() {
        Headers headers = new Headers();
        assertTrue(headers.isEmpty());
        headers.add("foo", "bar");
        assertFalse(headers.isEmpty());
        headers.remove("foo");
        assertTrue(headers.isEmpty());
    }
@author Simon Thoresen Hult
@author Einar M R Rosenvinge
application/src/test/java/com/yahoo/application/container/handler/HeadersTestCase.java