/*
* Copyright 2010-2017 Amazon.com, Inc. or its affiliates. All Rights
* Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.amazonaws.util;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import org.junit.Test;
public class ThrowablesTest {
@Test
public void typical() {
Throwable a = new Throwable();
Throwable b = new Throwable(a);
assertSame(a, Throwables.getRootCause(b));
assertSame(a, Throwables.getRootCause(a));
}
@Test
public void circularRef() {
// God forbidden
Throwable a = new Throwable();
Throwable b = new Throwable(a);
a.initCause(b);
assertSame(b, Throwables.getRootCause(b));
assertSame(a, Throwables.getRootCause(a));
}
@Test
public void nullCause() {
Throwable a = new Throwable();
assertSame(a, Throwables.getRootCause(a));
}
@Test
public void simplyNull() {
assertNull(Throwables.getRootCause(null));
}
}