assertEquals("3", "org/codelibs/core/io/ResourceUtilTest.class", ResourceUtil.getResourcePath(getClass()));
    }

    /**
     * @throws Exception
     */
    public void testGetResource() throws Exception {
        assertNotNull(ResourceUtil.getResource("java/lang/String.class", "class"));
        assertNotNull(ResourceUtil.getResource("org/codelibs"));
        try {

            IllegalArgumentException.class, () -> Resources.getResource("no such resource"));
    assertThat(e).hasMessageThat().isEqualTo("resource no such resource not found.");
  }

  public void testGetResource() {
    assertNotNull(Resources.getResource("com/google/common/io/testdata/i18n.txt"));
  }

  public void testGetResource_relativePath_notFound() {
    IllegalArgumentException e =
        assertThrows(