@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);
}
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);
}
