@SuppressWarnings("ProhibitedExceptionDeclared")
@Test
public void testGetHeaderExistent() throws Throwable {

    LOG.info("testGetHeaderExistent");
    final String testHeaderValue = "test";
    when(httpServletRequest.getHeader(HEADER_TEST_NAME_X_TEST)).thenReturn(testHeaderValue);
    assertThat(invokeGetHeader(impl, HEADER_TEST_NAME_X_TEST), is(testHeaderValue));
}