| /* |
| * 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); |
| } |
| } |