/*
* Copyright (C) 2008 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.primitives;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
/**
* Unit test for {@link Shorts}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
@SuppressWarnings("cast") // redundant casts are intentional and harmless
public class ShortsTest extends TestCase {
private static final short[] EMPTY = {};
private static final short[] ARRAY1 = {(short) 1};
private static final short[] ARRAY234
= {(short) 2, (short) 3, (short) 4};
private static final short LEAST = Short.MIN_VALUE;
private static final short GREATEST = Short.MAX_VALUE;
private static final short[] VALUES =
{ LEAST, (short) -1, (short) 0, (short) 1, GREATEST };
public void testHashCode() {
for (short value : VALUES) {
assertEquals(((Short) value).hashCode(), Shorts.hashCode(value));
}
}
public void testCheckedCast() {
for (short value : VALUES) {
assertEquals(value, Shorts.checkedCast((long) value));
}
assertCastFails(GREATEST + 1L);
assertCastFails(LEAST - 1L);
assertCastFails(Long.MAX_VALUE);
assertCastFails(Long.MIN_VALUE);
}
public void testSaturatedCast() {
for (short value : VALUES) {
assertEquals(value, Shorts.saturatedCast((long) value));
}
assertEquals(GREATEST, Shorts.saturatedCast(GREATEST + 1L));
assertEquals(LEAST, Shorts.saturatedCast(LEAST - 1L));
assertEquals(GREATEST, Shorts.saturatedCast(Long.MAX_VALUE));
assertEquals(LEAST, Shorts.saturatedCast(Long.MIN_VALUE));
}
private void assertCastFails(long value) {
try {
Shorts.checkedCast(value);
fail("Cast to short should have failed: " + value);
} catch (IllegalArgumentException ex) {
assertTrue(value + " not found in exception text: " + ex.getMessage(),
ex.getMessage().contains(String.valueOf(value)));
}
}
public void testCompare() {
for (short x : VALUES) {
for (short y : VALUES) {
// Only compare the sign of the result of compareTo().
int expected = Short.valueOf(x).compareTo(y);
int actual = Shorts.compare(x, y);
if (expected == 0) {
assertEquals(x + ", " + y, expected, actual);
} else if (expected < 0) {
assertTrue(x + ", " + y + " (expected: " + expected + ", actual" + actual + ")",
actual < 0);
} else {
assertTrue(x + ", " + y + " (expected: " + expected + ", actual" + actual + ")",
actual > 0);
}
}
}
}
public void testContains() {
assertFalse(Shorts.contains(EMPTY, (short) 1));
assertFalse(Shorts.contains(ARRAY1, (short) 2));
assertFalse(Shorts.contains(ARRAY234, (short) 1));
assertTrue(Shorts.contains(new short[] {(short) -1}, (short) -1));
assertTrue(Shorts.contains(ARRAY234, (short) 2));
assertTrue(Shorts.contains(ARRAY234, (short) 3));
assertTrue(Shorts.contains(ARRAY234, (short) 4));
}
public void testIndexOf() {
assertEquals(-1, Shorts.indexOf(EMPTY, (short) 1));
assertEquals(-1, Shorts.indexOf(ARRAY1, (short) 2));
assertEquals(-1, Shorts.indexOf(ARRAY234, (short) 1));
assertEquals(0, Shorts.indexOf(
new short[] {(short) -1}, (short) -1));
assertEquals(0, Shorts.indexOf(ARRAY234, (short) 2));
assertEquals(1, Shorts.indexOf(ARRAY234, (short) 3));
assertEquals(2, Shorts.indexOf(ARRAY234, (short) 4));
assertEquals(1, Shorts.indexOf(
new short[] { (short) 2, (short) 3, (short) 2, (short) 3 },
(short) 3));
}
public void testIndexOf_arrayTarget() {
assertEquals(0, Shorts.indexOf(EMPTY, EMPTY));
assertEquals(0, Shorts.indexOf(ARRAY234, EMPTY));
assertEquals(-1, Shorts.indexOf(EMPTY, ARRAY234));
assertEquals(-1, Shorts.indexOf(ARRAY234, ARRAY1));
assertEquals(-1, Shorts.indexOf(ARRAY1, ARRAY234));
assertEquals(0, Shorts.indexOf(ARRAY1, ARRAY1));
assertEquals(0, Shorts.indexOf(ARRAY234, ARRAY234));
assertEquals(0, Shorts.indexOf(
ARRAY234, new short[] { (short) 2, (short) 3 }));
assertEquals(1, Shorts.indexOf(
ARRAY234, new short[] { (short) 3, (short) 4 }));
assertEquals(1, Shorts.indexOf(ARRAY234, new short[] { (short) 3 }));
assertEquals(2, Shorts.indexOf(ARRAY234, new short[] { (short) 4 }));
assertEquals(1, Shorts.indexOf(new short[] { (short) 2, (short) 3,
(short) 3, (short) 3, (short) 3 },
new short[] { (short) 3 }
));
assertEquals(2, Shorts.indexOf(
new short[] { (short) 2, (short) 3, (short) 2,
(short) 3, (short) 4, (short) 2, (short) 3},
new short[] { (short) 2, (short) 3, (short) 4}
));
assertEquals(1, Shorts.indexOf(
new short[] { (short) 2, (short) 2, (short) 3,
(short) 4, (short) 2, (short) 3, (short) 4},
new short[] { (short) 2, (short) 3, (short) 4}
));
assertEquals(-1, Shorts.indexOf(
new short[] { (short) 4, (short) 3, (short) 2},
new short[] { (short) 2, (short) 3, (short) 4}
));
}
public void testLastIndexOf() {
assertEquals(-1, Shorts.lastIndexOf(EMPTY, (short) 1));
assertEquals(-1, Shorts.lastIndexOf(ARRAY1, (short) 2));
assertEquals(-1, Shorts.lastIndexOf(ARRAY234, (short) 1));
assertEquals(0, Shorts.lastIndexOf(
new short[] {(short) -1}, (short) -1));
assertEquals(0, Shorts.lastIndexOf(ARRAY234, (short) 2));
assertEquals(1, Shorts.lastIndexOf(ARRAY234, (short) 3));
assertEquals(2, Shorts.lastIndexOf(ARRAY234, (short) 4));
assertEquals(3, Shorts.lastIndexOf(
new short[] { (short) 2, (short) 3, (short) 2, (short) 3 },
(short) 3));
}
public void testMax_noArgs() {
try {
Shorts.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(LEAST, Shorts.max(LEAST));
assertEquals(GREATEST, Shorts.max(GREATEST));
assertEquals((short) 9, Shorts.max(
(short) 8, (short) 6, (short) 7,
(short) 5, (short) 3, (short) 0, (short) 9));
}
public void testMin_noArgs() {
try {
Shorts.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, Shorts.min(LEAST));
assertEquals(GREATEST, Shorts.min(GREATEST));
assertEquals((short) 0, Shorts.min(
(short) 8, (short) 6, (short) 7,
(short) 5, (short) 3, (short) 0, (short) 9));
}
public void testConcat() {
assertTrue(Arrays.equals(EMPTY, Shorts.concat()));
assertTrue(Arrays.equals(EMPTY, Shorts.concat(EMPTY)));
assertTrue(Arrays.equals(EMPTY, Shorts.concat(EMPTY, EMPTY, EMPTY)));
assertTrue(Arrays.equals(ARRAY1, Shorts.concat(ARRAY1)));
assertNotSame(ARRAY1, Shorts.concat(ARRAY1));
assertTrue(Arrays.equals(ARRAY1, Shorts.concat(EMPTY, ARRAY1, EMPTY)));
assertTrue(Arrays.equals(
new short[] {(short) 1, (short) 1, (short) 1},
Shorts.concat(ARRAY1, ARRAY1, ARRAY1)));
assertTrue(Arrays.equals(
new short[] {(short) 1, (short) 2, (short) 3, (short) 4},
Shorts.concat(ARRAY1, ARRAY234)));
}
@GwtIncompatible("Shorts.toByteArray")
public void testToByteArray() {
assertTrue(Arrays.equals(
new byte[] {0x23, 0x45}, Shorts.toByteArray((short) 0x2345)));
assertTrue(Arrays.equals(
new byte[] {(byte) 0xFE, (byte) 0xDC},
Shorts.toByteArray((short) 0xFEDC)));
}
@GwtIncompatible("Shorts.fromByteArray")
public void testFromByteArray() {
assertEquals((short) 0x2345,
Shorts.fromByteArray(new byte[] {0x23, 0x45}));
assertEquals((short) 0xFEDC, Shorts.fromByteArray(
new byte[] {(byte) 0xFE, (byte) 0xDC}));
try {
Shorts.fromByteArray(new byte[] {0x01});
fail();
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible("Shorts.fromBytes")
public void testFromBytes() {
assertEquals((short) 0x2345, Shorts.fromBytes((byte) 0x23, (byte) 0x45));
assertEquals((short) 0xFEDC, Shorts.fromBytes((byte) 0xFE, (byte) 0xDC));
}
@GwtIncompatible("Shorts.fromByteArray, Shorts.toByteArray")
public void testByteArrayRoundTrips() {
Random r = new Random(5);
byte[] b = new byte[Shorts.BYTES];
// total overkill, but, it takes 0.1 sec so why not...
for (int i = 0; i < 10000; i++) {
short num = (short) r.nextInt();
assertEquals(num, Shorts.fromByteArray(Shorts.toByteArray(num)));
r.nextBytes(b);
assertTrue(Arrays.equals(b,
Shorts.toByteArray(Shorts.fromByteArray(b))));
}
}
public void testEnsureCapacity() {
assertSame(EMPTY, Shorts.ensureCapacity(EMPTY, 0, 1));
assertSame(ARRAY1, Shorts.ensureCapacity(ARRAY1, 0, 1));
assertSame(ARRAY1, Shorts.ensureCapacity(ARRAY1, 1, 1));
assertTrue(Arrays.equals(
new short[] {(short) 1, (short) 0, (short) 0},
Shorts.ensureCapacity(ARRAY1, 2, 1)));
}
public void testEnsureCapacity_fail() {
try {
Shorts.ensureCapacity(ARRAY1, -1, 1);
fail();
} catch (IllegalArgumentException expected) {
}
try {
// notice that this should even fail when no growth was needed
Shorts.ensureCapacity(ARRAY1, 1, -1);
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testJoin() {
assertEquals("", Shorts.join(",", EMPTY));
assertEquals("1", Shorts.join(",", ARRAY1));
assertEquals("1,2", Shorts.join(",", (short) 1, (short) 2));
assertEquals("123",
Shorts.join("", (short) 1, (short) 2, (short) 3));
}
public void testLexicographicalComparator() {
List<short[]> ordered = Arrays.asList(
new short[] {},
new short[] {LEAST},
new short[] {LEAST, LEAST},
new short[] {LEAST, (short) 1},
new short[] {(short) 1},
new short[] {(short) 1, LEAST},
new short[] {GREATEST, GREATEST - (short) 1},
new short[] {GREATEST, GREATEST},
new short[] {GREATEST, GREATEST, GREATEST});
Comparator<short[]> comparator = Shorts.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
}
@GwtIncompatible("SerializableTester")
public void testLexicographicalComparatorSerializable() {
Comparator<short[]> comparator = Shorts.lexicographicalComparator();
assertSame(comparator, SerializableTester.reserialize(comparator));
}
public void testToArray() {
// need explicit type parameter to avoid javac warning!?
List<Short> none = Arrays.<Short>asList();
assertTrue(Arrays.equals(EMPTY, Shorts.toArray(none)));
List<Short> one = Arrays.asList((short) 1);
assertTrue(Arrays.equals(ARRAY1, Shorts.toArray(one)));
short[] array = {(short) 0, (short) 1, (short) 3};
List<Short> three = Arrays.asList((short) 0, (short) 1, (short) 3);
assertTrue(Arrays.equals(array, Shorts.toArray(three)));
assertTrue(Arrays.equals(array, Shorts.toArray(Shorts.asList(array))));
}
public void testToArray_threadSafe() {
for (int delta : new int[] { +1, 0, -1 }) {
for (int i = 0; i < VALUES.length; i++) {
List<Short> list = Shorts.asList(VALUES).subList(0, i);
Collection<Short> misleadingSize =
Helpers.misleadingSizeCollection(delta);
misleadingSize.addAll(list);
short[] arr = Shorts.toArray(misleadingSize);
assertEquals(i, arr.length);
for (int j = 0; j < i; j++) {
assertEquals(VALUES[j], arr[j]);
}
}
}
}
public void testToArray_withNull() {
List<Short> list = Arrays.asList((short) 0, (short) 1, null);
try {
Shorts.toArray(list);
fail();
} catch (NullPointerException expected) {
}
}
public void testToArray_withConversion() {
short[] array = {(short) 0, (short) 1, (short) 2};
List<Byte> bytes = Arrays.asList((byte) 0, (byte) 1, (byte) 2);
List<Short> shorts = Arrays.asList((short) 0, (short) 1, (short) 2);
List<Integer> ints = Arrays.asList(0, 1, 2);
List<Float> floats = Arrays.asList((float) 0, (float) 1, (float) 2);
List<Long> longs = Arrays.asList((long) 0, (long) 1, (long) 2);
List<Double> doubles = Arrays.asList((double) 0, (double) 1, (double) 2);
assertTrue(Arrays.equals(array, Shorts.toArray(bytes)));
assertTrue(Arrays.equals(array, Shorts.toArray(shorts)));
assertTrue(Arrays.equals(array, Shorts.toArray(ints)));
assertTrue(Arrays.equals(array, Shorts.toArray(floats)));
assertTrue(Arrays.equals(array, Shorts.toArray(longs)));
assertTrue(Arrays.equals(array, Shorts.toArray(doubles)));
}
public void testAsList_isAView() {
short[] array = {(short) 0, (short) 1};
List<Short> list = Shorts.asList(array);
list.set(0, (short) 2);
assertTrue(Arrays.equals(new short[] {(short) 2, (short) 1}, array));
array[1] = (short) 3;
assertEquals(Arrays.asList((short) 2, (short) 3), list);
}
public void testAsList_toArray_roundTrip() {
short[] array = { (short) 0, (short) 1, (short) 2 };
List<Short> list = Shorts.asList(array);
short[] newArray = Shorts.toArray(list);
// Make sure it returned a copy
list.set(0, (short) 4);
assertTrue(Arrays.equals(
new short[] { (short) 0, (short) 1, (short) 2 }, newArray));
newArray[1] = (short) 5;
assertEquals((short) 1, (short) list.get(1));
}
// This test stems from a real bug found by andrewk
public void testAsList_subList_toArray_roundTrip() {
short[] array = { (short) 0, (short) 1, (short) 2, (short) 3 };
List<Short> list = Shorts.asList(array);
assertTrue(Arrays.equals(new short[] { (short) 1, (short) 2 },
Shorts.toArray(list.subList(1, 3))));
assertTrue(Arrays.equals(new short[] {},
Shorts.toArray(list.subList(2, 2))));
}
public void testAsListEmpty() {
assertSame(Collections.emptyList(), Shorts.asList(EMPTY));
}
@GwtIncompatible("NullPointerTester")
public void testNulls() {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(short[].class, new short[0]);
tester.testAllPublicStaticMethods(Shorts.class);
}
}