@Test
  public void testReverseOrderRandomIntegers() {
    Comparator<Integer> naturalOrder = new NaturalOrder<Integer>();
    Comparator<Integer> reverse = CollectionUtil.reverseOrder(naturalOrder);

    Random random = new Random(243249878l); // Stable "random" sequence

    for (int i = 0; i < 65536; i++) {
      // Verified to be ~ 50/50 lt/gt
      int integer = random.nextInt();
      int integerToo = random.nextInt();

      assertEquals(0, reverse.compare(integer, integer));
      assertEquals(0, reverse.compare(integerToo, integerToo));

      int natural = naturalOrder.compare(integer, integerToo);

      if (natural == 0) {
        // Actually never hits, but eq case is tested above
        assertEquals(0, reverse.compare(integer, integerToo));
      } else if (natural < 0) {
        assertTrue(reverse.compare(integer, integerToo) > 0);
      } else {
        assertTrue(reverse.compare(integer, integerToo) < 0);
      }
    }
  }
 @Test
 public void testGetMaxInt() {
   int test1 = 1;
   int test2 = 2;
   int output = test.getMax(test1, test2);
   assertEquals(2, output);
 }
 @Test
 public void testGetMaxString() {
   String test1 = "1";
   String test2 = "2";
   String output = test.getMax(test1, test2);
   assertEquals("2", output);
 }
 @Test
 public void testGetMaxDouble() {
   double test1 = 1;
   double test2 = 2;
   double output = test.getMax(test1, test2);
   assertEquals(2.0, output, 1);
 }
Beispiel #5
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  private static <C> void assertListsEqual(
      List<C> expectedList, List<C> actualList, Comparator<C> comparator, String name) {
    List<C> notFoundExpected = new ArrayList<C>();
    List<C> notFoundActual = new ArrayList<C>();
    for (C expected : expectedList) {
      boolean found = false;
      for (C actual : actualList) {
        if (comparator.compare(actual, expected) == 0) {
          found = true;
          break;
        }
      }
      if (!found) {
        notFoundExpected.add(expected);
      }
    }

    for (C actual : actualList) {
      boolean found = false;
      for (C expected : expectedList) {
        if (comparator.compare(actual, expected) == 0) {
          found = true;
          break;
        }
      }
      if (!found) {
        notFoundActual.add(actual);
      }
    }

    if (!notFoundExpected.isEmpty()) {
      fail("Not found expected " + name + " " + Arrays.toString(notFoundExpected.toArray()));
    }

    if (!notFoundActual.isEmpty()) {
      fail("Not expected " + name + " " + Arrays.toString(notFoundActual.toArray()));
    }
  }
  @Test
  public void testReverseOrder() {
    Comparator<String> naturalOrder = new NaturalOrder<String>();
    Comparator<String> reverse = CollectionUtil.reverseOrder(naturalOrder);

    assertNotNull(reverse);

    assertEquals(0, naturalOrder.compare("foo", "foo"));
    assertEquals(0, reverse.compare("foo", "foo"));

    assertTrue(naturalOrder.compare("bar", "baz") < 0);
    assertTrue(reverse.compare("bar", "baz") > 0);

    assertTrue(naturalOrder.compare("baz", "bar") > 0);
    assertTrue(reverse.compare("baz", "bar") < 0);
  }