/*
* Copyright (C) 2006 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.base;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.testing.NullPointerTester;
import junit.framework.TestCase;
/**
* Tests for {@link Objects}.
*
* @author Laurence Gonsalves
*/
@GwtCompatible(emulated = true)
public class ObjectsTest extends TestCase {
public void testEqual() throws Exception {
assertTrue(Objects.equal(1, 1));
assertTrue(Objects.equal(null, null));
// test distinct string objects
String s1 = "foobar";
String s2 = new String(s1);
assertTrue(Objects.equal(s1, s2));
assertFalse(Objects.equal(s1, null));
assertFalse(Objects.equal(null, s1));
assertFalse(Objects.equal("foo", "bar"));
assertFalse(Objects.equal("1", 1));
}
public void testHashCode() throws Exception {
int h1 = Objects.hashCode(1, "two", 3.0);
int h2 = Objects.hashCode(
new Integer(1), new String("two"), new Double(3.0));
// repeatable
assertEquals(h1, h2);
// These don't strictly need to be true, but they're nice properties.
assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, 2));
assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, null, 2));
assertTrue(Objects.hashCode(1, null, 2) != Objects.hashCode(1, 2));
assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(3, 2, 1));
assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(2, 3, 1));
}
public void testFirstNonNull_withNonNull() throws Exception {
String s1 = "foo";
String s2 = Objects.firstNonNull(s1, "bar");
assertSame(s1, s2);
Long n1 = new Long(42);
Long n2 = Objects.firstNonNull(null, n1);
assertSame(n1, n2);
}
public void testFirstNonNull_throwsNullPointerException() throws Exception {
try {
Objects.firstNonNull(null, null);
fail("expected NullPointerException");
} catch (NullPointerException expected) {
}
}
@GwtIncompatible("NullPointerTester")
public void testNullPointers() {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicStaticMethods(Objects.class);
}
}