public void testNullMonitorInGuardConstructorThrowsNPE() {
    assertThrows(NullPointerException.class, () -> new FlagGuard(null));
  }

  public void testIsFair() {
    assertTrue(new Monitor(true).isFair());
    assertFalse(new Monitor(false).isFair());
  }

  public void testOccupiedMethods() {
    Monitor monitor = new Monitor();
    verifyOccupiedMethodsInCurrentThread(monitor, false, false, 0);

  public void testNullMonitorInGuardConstructorThrowsNPE() {
    assertThrows(NullPointerException.class, () -> new FlagGuard(null));
  }

  public void testIsFair() {
    assertTrue(new Monitor(true).isFair());
    assertFalse(new Monitor(false).isFair());
  }

  public void testOccupiedMethods() {
    Monitor monitor = new Monitor();
    verifyOccupiedMethodsInCurrentThread(monitor, false, false, 0);

    K key = secondEntry.getKey();
    SortedMap<K, V> subMap = map.tailMap(key);
    subMap.remove(key);
    assertNull(subMap.remove(firstEntry.getKey()));
    assertEquals(map.size(), oldSize - 1);
    assertFalse(map.containsKey(key));
    assertEquals(subMap.size(), oldSize - 2);
  }

  public void testTailMapClearThrough() {
    SortedMap<K, V> map;
    try {
      map = makePopulatedMap();

      fail("Should have thrown ParseException: " + spec);
    } catch (ParseException expected) {
      assertThat(expected).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
    }

    assertFalse(HostSpecifier.isValid(spec));
  }

    K key = secondEntry.getKey();
    SortedMap<K, V> subMap = map.tailMap(key);
    subMap.remove(key);
    assertNull(subMap.remove(firstEntry.getKey()));
    assertEquals(map.size(), oldSize - 1);
    assertFalse(map.containsKey(key));
    assertEquals(subMap.size(), oldSize - 2);
  }

  public void testTailMapClearThrough() {
    SortedMap<K, V> map;
    try {
      map = makePopulatedMap();

    assertEquals(
        HashCode.fromBytes(new byte[] {(byte) 0xa0, 0, 0, 0}),
        Hashing.combineOrdered(ImmutableList.of(hash32, hash32, hash32)));
    assertFalse(
        Hashing.combineOrdered(ImmutableList.of(hash31, hash32))
            .equals(Hashing.combineOrdered(ImmutableList.of(hash32, hash31))));
  }

  public void testCombineOrdered_randomHashCodes() {

        Files.createFile(existingDir.resolve("test.txt"));

        assertTrue(Files.exists(existingDir));
        themeHelper.closeQuietly(existingDir);
        // Directory should be deleted
        assertFalse(Files.exists(existingDir));
    }

    public void test_closeQuietly_nestedDirectory() throws IOException {
        Path nestedDir = tempDir.resolve("parent").resolve("child");

        // Verify that Secured annotation's target does not include CONSTRUCTOR
        Target target = Secured.class.getAnnotation(Target.class);
        ElementType[] targetTypes = target.value();
        assertFalse(Arrays.asList(targetTypes).contains(ElementType.CONSTRUCTOR));
    }

    // Test annotation on field (should not compile, but test for completeness)
    public void test_fieldCannotBeAnnotated() {

      builder.add(-1);
      Object[] prevArray = null;
      for (int i = 0; i < 10; i++) {
        ImmutableSet<Integer> prevBuilt = builder.build();
        builder.add(i);
        assertFalse(prevBuilt.contains(i));
        assertNotSame(builder.contents, prevArray);
        prevArray = builder.contents;
      }
    }
  }

  public void testCreation_arrayOfArray() {

    ByteSource source = newByteSource(0, 10);
    ByteSource joined = ByteSource.concat(source, source);
    assertEquals(20, joined.size());
    InputStream in = joined.openStream();
    assertFalse(in.markSupported());
    assertEquals(10, in.available());
    int total = 0;
    while (in.read() != -1) {
      total++;
    }
    assertEquals(0, in.available());
    assertEquals(20, total);
  }