@Test
public void getExpireAfter_returnsNullIfHeaderValueBelowMinusOne(TestContext testContext) {

    // Mock
    final String headerValue = "-2147483640";
    final MultiMap headers = createHeaderReturningSimpleValue(HTTP_HEADER_X_EXPIRE_AFTER, headerValue);
    // Trigger work
    final Integer returnedValue = ExpiryCheckHandler.getExpireAfter(headers);
    // Assert
    testContext.assertNull(returnedValue);
}