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