/** Tests if equal and hashCode method still hold the contract. */
@Test
public void testEqualsAndHashCode() {
String failureReason;
SortedMapWritable mapA = new SortedMapWritable();
SortedMapWritable mapB = new SortedMapWritable();
// Sanity checks
failureReason = "SortedMapWritable couldn't be initialized. Got null reference";
assertNotNull(failureReason, mapA);
assertNotNull(failureReason, mapB);
// Basic null check
assertFalse("equals method returns true when passed null", mapA.equals(null));
// When entry set is empty, they should be equal
assertTrue("Two empty SortedMapWritables are no longer equal", mapA.equals(mapB));
// Setup
Text[] keys = {new Text("key1"), new Text("key2")};
BytesWritable[] values = {
new BytesWritable("value1".getBytes()), new BytesWritable("value2".getBytes())
};
mapA.put(keys[0], values[0]);
mapB.put(keys[1], values[1]);
// entrySets are different
failureReason = "Two SortedMapWritables with different data are now equal";
assertTrue(failureReason, mapA.hashCode() != mapB.hashCode());
assertTrue(failureReason, !mapA.equals(mapB));
assertTrue(failureReason, !mapB.equals(mapA));
mapA.put(keys[1], values[1]);
mapB.put(keys[0], values[0]);
// entrySets are now same
failureReason =
"Two SortedMapWritables with same entry sets formed in different order are now different";
assertEquals(failureReason, mapA.hashCode(), mapB.hashCode());
assertTrue(failureReason, mapA.equals(mapB));
assertTrue(failureReason, mapB.equals(mapA));
// Let's check if entry sets of same keys but different values
mapA.put(keys[0], values[1]);
mapA.put(keys[1], values[0]);
failureReason = "Two SortedMapWritables with different content are now equal";
assertTrue(failureReason, mapA.hashCode() != mapB.hashCode());
assertTrue(failureReason, !mapA.equals(mapB));
assertTrue(failureReason, !mapB.equals(mapA));
}
