@Test
public void shouldParseNumericHeader() {

    Headers customHeaders = new Headers();
    customHeaders.setHeader("intKey", "3333");
    customHeaders.setHeader("unableToParseKey", "AAAA");
    httpServletRequestImpl = builder.withHeaders(customHeaders).build();
    assertThat(httpServletRequestImpl.getIntHeader("missingIntKey"), is(-1));
    assertThat(httpServletRequestImpl.getIntHeader("intKey"), is(3333));
    assertThat(httpServletRequestImpl.getIntHeader("unableToParseKey"), is(0));
}