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/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 'b'.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-'b'.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.collect;
import static com.google.common.collect.BstSide.LEFT;
import static com.google.common.collect.BstSide.RIGHT;
import static com.google.common.collect.BstTesting.defaultNullPointerTester;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.BstTesting.SimpleNode;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.List;
/**
* Tests for {@code BstNode}.
*
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
public class BstNodeTest extends TestCase {
private void testLacksChild(SimpleNode node, BstSide side) {
assertNull(node.childOrNull(side));
assertFalse(node.hasChild(side));
try {
node.getChild(side);
fail("Expected IllegalStateException");
} catch (IllegalStateException expected) {}
}
private void testChildIs(SimpleNode node, BstSide side, SimpleNode expectedChild) {
assertEquals(expectedChild, node.childOrNull(side));
assertTrue(node.hasChild(side));
assertEquals(expectedChild, node.getChild(side));
}
public void testHasChildLeaf() {
SimpleNode leaf = new SimpleNode('a', null, null);
testLacksChild(leaf, LEFT);
testLacksChild(leaf, RIGHT);
}
public void testHasChildLeftOnly() {
SimpleNode leaf = new SimpleNode('a', null, null);
SimpleNode node = new SimpleNode('b', leaf, null);
testChildIs(node, LEFT, leaf);
testLacksChild(node, RIGHT);
}
public void testHasChildRightOnly() {
SimpleNode leaf = new SimpleNode('c', null, null);
SimpleNode node = new SimpleNode('b', null, leaf);
testLacksChild(node, LEFT);
testChildIs(node, RIGHT, leaf);
}
public void testHasChildBoth() {
SimpleNode left = new SimpleNode('a', null, null);
SimpleNode right = new SimpleNode('c', null, null);
SimpleNode node = new SimpleNode('b', left, right);
testChildIs(node, LEFT, left);
testChildIs(node, RIGHT, right);
}
private static final char MIDDLE_KEY = 'b';
private static final List<SimpleNode> GOOD_LEFTS =
Arrays.asList(null, new SimpleNode('a', null, null));
private static final List<SimpleNode> BAD_LEFTS =
Arrays.asList(new SimpleNode('b', null, null), new SimpleNode('c', null, null));
private static final Iterable<SimpleNode> ALL_LEFTS = Iterables.concat(GOOD_LEFTS, BAD_LEFTS);
private static final List<SimpleNode> GOOD_RIGHTS =
Arrays.asList(null, new SimpleNode('c', null, null));
private static final List<SimpleNode> BAD_RIGHTS =
Arrays.asList(new SimpleNode('b', null, null), new SimpleNode('a', null, null));
private static final Iterable<SimpleNode> ALL_RIGHTS = Iterables.concat(GOOD_RIGHTS, BAD_RIGHTS);
public void testOrderingInvariantHoldsForGood() {
for (SimpleNode left : GOOD_LEFTS) {
for (SimpleNode right : GOOD_RIGHTS) {
assertTrue(
new SimpleNode(MIDDLE_KEY, left, right).orderingInvariantHolds(Ordering.natural()));
}
}
}
public void testOrderingInvariantBadLeft() {
for (SimpleNode left : BAD_LEFTS) {
for (SimpleNode right : ALL_RIGHTS) {
assertFalse(
new SimpleNode(MIDDLE_KEY, left, right).orderingInvariantHolds(Ordering.natural()));
}
}
}
public void testOrderingInvariantBadRight() {
for (SimpleNode left : ALL_LEFTS) {
for (SimpleNode right : BAD_RIGHTS) {
assertFalse(
new SimpleNode(MIDDLE_KEY, left, right).orderingInvariantHolds(Ordering.natural()));
}
}
}
@GwtIncompatible("NullPointerTester")
public void testNullPointers() throws Exception {
defaultNullPointerTester().testAllPublicStaticMethods(BstNode.class);
}
}
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