confPath = ResourceUtil.getConfPath("dir1", "dir2", "file.conf");
        assertNotNull(confPath);
        assertTrue(confPath.toString().contains("dir1"));
        assertTrue(confPath.toString().contains("dir2"));
        assertTrue(confPath.toString().contains("file.conf"));
    }

    @Test
    public void test_getConfOrClassesPath() {
        // Test behavior when resource is not found
        try {

        assertTrue("Should contain all keys", Arrays.asList(keys).contains("lang"));
        assertTrue("Should contain all keys", Arrays.asList(keys).contains("a_key"));
        assertTrue("Should contain all keys", Arrays.asList(keys).contains("b_key"));
        assertTrue("Should contain all keys", Arrays.asList(keys).contains("c_key"));
    }

    @Test

        assertTrue(mockConfig.getApiPingEsFieldSet().contains("active_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("relocating_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("initializing_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("unassigned_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("delayed_unassigned_shards"));

    assertThat(graph.edgeValueOrDefault(4, 4, DEFAULT)).isEqualTo("valueD");

    String toString = graph.toString();
    assertThat(toString).contains("valueA");
    assertThat(toString).contains("valueB");
    assertThat(toString).contains("valueC");
    assertThat(toString).contains("valueD");
  }

  @Test
  public void undirectedGraph() {
    graph = ValueGraphBuilder.undirected().allowsSelfLoops(true).build();

        assertTrue(tag.toString().contains("id=main-modal"));
        assertTrue(tag.toString().contains("css=modal"));
        assertTrue(tag.toString().contains("attrName=data-toggle"));
        assertTrue(tag.toString().contains("attrValue=modal"));

        // Test multiple tags with different combinations
        tags = PrunedTag.parse("a[href=#].nav-link, div.container, span#status");
        assertEquals(3, tags.length);

        assertEquals(servletException, runtimeException.getCause());

        // Verify that the message is preserved from the cause
        assertTrue(runtimeException.getMessage().contains(ServletException.class.getName()));
        assertTrue(runtimeException.getMessage().contains(errorMessage));
    }

    @Test
    public void test_constructor_withServletExceptionWithCause() {
        // Create a root cause exception

    assertThat(graph.edgeValueOrDefault(4, 4, DEFAULT)).isEqualTo("valueD");

    String toString = graph.toString();
    assertThat(toString).contains("valueA");
    assertThat(toString).contains("valueB");
    assertThat(toString).contains("valueC");
    assertThat(toString).contains("valueD");
  }

  @Test
  public void undirectedGraph() {
    graph = ValueGraphBuilder.undirected().allowsSelfLoops(true).build();

      }
    };
  }

  /**
   * Returns an unmodifiable <b>view</b> of the difference of two sets. The returned set contains
   * all elements that are contained by {@code set1} and not contained by {@code set2}. {@code set2}
   * may also contain elements not present in {@code set1}; these are simply ignored. The iteration
   * order of the returned set matches that of {@code set1}.
   *

          }

          // Mostly safe: We check contains(u) before calling successors(u), so we perform unsafe
          // operations only in weird cases like checking for an EndpointPair<ArrayList> in a
          // Network<LinkedList>.
          @SuppressWarnings("unchecked")
          @Override
          public boolean contains(@Nullable Object obj) {
            if (!(obj instanceof EndpointPair)) {

    try {
      assertFalse(getMap().entrySet().contains(mapEntry(IncomparableType.INSTANCE, v0())));
    } catch (ClassCastException acceptable) {
      // allowed by the spec
    }
  }

  public void testContainsEntryWithIncomparableValue() {
    try {
      assertFalse(getMap().entrySet().contains(mapEntry(k0(), IncomparableType.INSTANCE)));
    } catch (ClassCastException acceptable) {