@Test
    void requireThatHashCodeWorksAsExpected() {
        Headers lhs = new Headers();
        Headers rhs = new Headers();
        assertEquals(lhs.hashCode(), rhs.hashCode());
        lhs.add("foo", "bar");
        assertTrue(lhs.hashCode() != rhs.hashCode());
        rhs.add("foo", "bar");
        assertEquals(lhs.hashCode(), rhs.hashCode());
    }
@author Simon Thoresen Hult
@author Einar M R Rosenvinge
application/src/test/java/com/yahoo/application/container/handler/HeadersTestCase.java