/*
* Copyright (C) 2011 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.testing.NullPointerTester;
import junit.framework.TestCase;
import java.util.Random;
/**
* Tests for UnsignedInts
*
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
public class UnsignedIntsTest extends TestCase {
private static final long[] UNSIGNED_INTS = {
0L,
1L,
2L,
3L,
0x12345678L,
0x5a4316b8L,
0x6cf78a4bL,
0xff1a618bL,
0xfffffffdL,
0xfffffffeL,
0xffffffffL};
public void testToLong() {
for (long a : UNSIGNED_INTS) {
assertEquals(a, UnsignedInts.toLong((int) a));
}
}
public void testCompare() {
for (long a : UNSIGNED_INTS) {
for (long b : UNSIGNED_INTS) {
int cmpAsLongs = Longs.compare(a, b);
int cmpAsUInt = UnsignedInts.compare((int) a, (int) b);
assertEquals(Integer.signum(cmpAsLongs), Integer.signum(cmpAsUInt));
}
}
}
public void testDivide() {
for (long a : UNSIGNED_INTS) {
for (long b : UNSIGNED_INTS) {
try {
assertEquals((int) (a / b), UnsignedInts.divide((int) a, (int) b));
assertFalse(b == 0);
} catch (ArithmeticException e) {
assertEquals(0, b);
}
}
}
}
public void testRemainder() {
for (long a : UNSIGNED_INTS) {
for (long b : UNSIGNED_INTS) {
try {
assertEquals((int) (a % b), UnsignedInts.remainder((int) a, (int) b));
assertFalse(b == 0);
} catch (ArithmeticException e) {
assertEquals(0, b);
}
}
}
}
@GwtIncompatible("Too slow in GWT (~3min fully optimized)")
public void testDivideRemainderEuclideanProperty() {
// Use a seed so that the test is deterministic:
Random r = new Random(0L);
for (int i = 0; i < 1000000; i++) {
int dividend = r.nextInt();
int divisor = r.nextInt();
// Test that the Euclidean property is preserved:
assertTrue(dividend
- (divisor * UnsignedInts.divide(dividend, divisor) + UnsignedInts.remainder(dividend,
divisor)) == 0);
}
}
public void testParseInt() {
try {
for (long a : UNSIGNED_INTS) {
assertEquals((int) a, UnsignedInts.parseUnsignedInt(Long.toString(a)));
}
} catch (NumberFormatException e) {
fail(e.getMessage());
}
try {
UnsignedInts.parseUnsignedInt(Long.toString(1L << 32));
fail("Expected NumberFormatException");
} catch (NumberFormatException expected) {}
}
public void testParseLongWithRadix() throws NumberFormatException {
for (long a : UNSIGNED_INTS) {
for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
assertEquals((int) a, UnsignedInts.parseUnsignedInt(Long.toString(a, radix), radix));
}
}
// loops through all legal radix values.
for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
// tests can successfully parse a number string with this radix.
String maxAsString = Long.toString((1L << 32) - 1, radix);
assertEquals(-1, UnsignedInts.parseUnsignedInt(maxAsString, radix));
try {
// tests that we get exception whre an overflow would occur.
long overflow = 1L << 32;
String overflowAsString = Long.toString(overflow, radix);
UnsignedInts.parseUnsignedInt(overflowAsString, radix);
fail();
} catch (NumberFormatException expected) {}
}
}
public void testParseLongThrowsExceptionForInvalidRadix() {
// Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX,
// inclusive.
try {
UnsignedInts.parseUnsignedInt("0", Character.MIN_RADIX - 1);
fail();
} catch (NumberFormatException expected) {}
try {
UnsignedInts.parseUnsignedInt("0", Character.MAX_RADIX + 1);
fail();
} catch (NumberFormatException expected) {}
// The radix is used as an array index, so try a negative value.
try {
UnsignedInts.parseUnsignedInt("0", -1);
fail();
} catch (NumberFormatException expected) {}
}
public void testToString() {
int[] bases = {2, 5, 7, 8, 10, 16};
for (long a : UNSIGNED_INTS) {
for (int base : bases) {
assertEquals(UnsignedInts.toString((int) a, base), Long.toString(a, base));
}
}
}
@GwtIncompatible("NullPointerTester")
public void testNulls() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(int[].class, new int[0]);
tester.testAllPublicStaticMethods(UnsignedInts.class);
}
}