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/*
* 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 java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import junit.framework.TestCase;
/**
* Unit test for {@link SignedBytes}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
@SuppressWarnings("cast") // redundant casts are intentional and harmless
public class SignedBytesTest extends TestCase {
private static final byte[] EMPTY = {};
private static final byte[] ARRAY1 = {(byte) 1};
private static final byte LEAST = Byte.MIN_VALUE;
private static final byte GREATEST = Byte.MAX_VALUE;
private static final byte[] VALUES = {LEAST, -1, 0, 1, GREATEST};
public void testCheckedCast() {
for (byte value : VALUES) {
assertEquals(value, SignedBytes.checkedCast((long) value));
}
assertCastFails(GREATEST + 1L);
assertCastFails(LEAST - 1L);
assertCastFails(Long.MAX_VALUE);
assertCastFails(Long.MIN_VALUE);
}
public void testSaturatedCast() {
for (byte value : VALUES) {
assertEquals(value, SignedBytes.saturatedCast((long) value));
}
assertEquals(GREATEST, SignedBytes.saturatedCast(GREATEST + 1L));
assertEquals(LEAST, SignedBytes.saturatedCast(LEAST - 1L));
assertEquals(GREATEST, SignedBytes.saturatedCast(Long.MAX_VALUE));
assertEquals(LEAST, SignedBytes.saturatedCast(Long.MIN_VALUE));
}
private static void assertCastFails(long value) {
try {
SignedBytes.checkedCast(value);
fail("Cast to byte 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 (byte x : VALUES) {
for (byte y : VALUES) {
// Only compare the sign of the result of compareTo().
int expected = Byte.valueOf(x).compareTo(y);
int actual = SignedBytes.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 testMax_noArgs() {
try {
SignedBytes.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(LEAST, SignedBytes.max(LEAST));
assertEquals(GREATEST, SignedBytes.max(GREATEST));
assertEquals(
(byte) 127, SignedBytes.max((byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
}
public void testMin_noArgs() {
try {
SignedBytes.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, SignedBytes.min(LEAST));
assertEquals(GREATEST, SignedBytes.min(GREATEST));
assertEquals(
(byte) -128, SignedBytes.min((byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
}
public void testJoin() {
assertEquals("", SignedBytes.join(",", EMPTY));
assertEquals("1", SignedBytes.join(",", ARRAY1));
assertEquals("1,2", SignedBytes.join(",", (byte) 1, (byte) 2));
assertEquals("123", SignedBytes.join("", (byte) 1, (byte) 2, (byte) 3));
assertEquals("-128,-1", SignedBytes.join(",", (byte) -128, (byte) -1));
}
public void testLexicographicalComparator() {
List<byte[]> ordered =
Arrays.asList(
new byte[] {},
new byte[] {LEAST},
new byte[] {LEAST, LEAST},
new byte[] {LEAST, (byte) 1},
new byte[] {(byte) 1},
new byte[] {(byte) 1, LEAST},
new byte[] {GREATEST, GREATEST - (byte) 1},
new byte[] {GREATEST, GREATEST},
new byte[] {GREATEST, GREATEST, GREATEST});
Comparator<byte[]> comparator = SignedBytes.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
}
@GwtIncompatible // SerializableTester
public void testLexicographicalComparatorSerializable() {
Comparator<byte[]> comparator = SignedBytes.lexicographicalComparator();
assertSame(comparator, SerializableTester.reserialize(comparator));
}
public void testSortDescending() {
testSortDescending(new byte[] {}, new byte[] {});
testSortDescending(new byte[] {1}, new byte[] {1});
testSortDescending(new byte[] {1, 2}, new byte[] {2, 1});
testSortDescending(new byte[] {1, 3, 1}, new byte[] {3, 1, 1});
testSortDescending(new byte[] {-1, 1, -2, 2}, new byte[] {2, 1, -1, -2});
}
private static void testSortDescending(byte[] input, byte[] expectedOutput) {
input = Arrays.copyOf(input, input.length);
SignedBytes.sortDescending(input);
assertTrue(Arrays.equals(expectedOutput, input));
}
private static void testSortDescending(
byte[] input, int fromIndex, int toIndex, byte[] expectedOutput) {
input = Arrays.copyOf(input, input.length);
SignedBytes.sortDescending(input, fromIndex, toIndex);
assertTrue(Arrays.equals(expectedOutput, input));
}
public void testSortDescendingIndexed() {
testSortDescending(new byte[] {}, 0, 0, new byte[] {});
testSortDescending(new byte[] {1}, 0, 1, new byte[] {1});
testSortDescending(new byte[] {1, 2}, 0, 2, new byte[] {2, 1});
testSortDescending(new byte[] {1, 3, 1}, 0, 2, new byte[] {3, 1, 1});
testSortDescending(new byte[] {1, 3, 1}, 0, 1, new byte[] {1, 3, 1});
testSortDescending(new byte[] {-1, -2, 1, 2}, 1, 3, new byte[] {-1, 1, -2, 2});
}
@GwtIncompatible // NullPointerTester
public void testNulls() {
new NullPointerTester().testAllPublicStaticMethods(SignedBytes.class);
}
}
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