@Test
    public void testExceptionMapping404() throws Exception {
        SparkTestUtil.UrlResponse response = doGet("/filethatdoesntexist.html");

        Assert.assertEquals(404, response.status);
        Assert.assertEquals(NOT_FOUND_BRO, response.body);
    }
Used to verify that "normal" functionality works after static files mapping
src/test/java/spark/staticfiles/StaticFilesTest.java