/*
* 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.collect.ImmutableSet;
import com.google.common.testing.EqualsTester;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import java.math.BigInteger;
import junit.framework.TestCase;
/**
* Tests for {@code UnsignedInteger}.
*
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
public class UnsignedIntegerTest extends TestCase {
private static final ImmutableSet<Integer> TEST_INTS;
private static final ImmutableSet<Long> TEST_LONGS;
private static int force32(int value) {
// GWT doesn't consistently overflow values to make them 32-bit, so we need to force it.
return value & 0xffffffff;
}
static {
ImmutableSet.Builder<Integer> testIntsBuilder = ImmutableSet.builder();
ImmutableSet.Builder<Long> testLongsBuilder = ImmutableSet.builder();
for (int i = -3; i <= 3; i++) {
testIntsBuilder
.add(i)
.add(force32(Integer.MIN_VALUE + i))
.add(force32(Integer.MAX_VALUE + i));
testLongsBuilder
.add((long) i)
.add((long) Integer.MIN_VALUE + i)
.add((long) Integer.MAX_VALUE + i)
.add((1L << 32) + i);
}
TEST_INTS = testIntsBuilder.build();
TEST_LONGS = testLongsBuilder.build();
}
public void testFromIntBitsAndIntValueAreInverses() {
for (int value : TEST_INTS) {
assertEquals(UnsignedInts.toString(value), value, UnsignedInteger.fromIntBits(value)
.intValue());
}
}
public void testFromIntBitsLongValue() {
for (int value : TEST_INTS) {
long expected = value & 0xffffffffL;
assertEquals(UnsignedInts.toString(value), expected, UnsignedInteger.fromIntBits(value)
.longValue());
}
}
public void testValueOfLong() {
long min = 0;
long max = (1L << 32) - 1;
for (long value : TEST_LONGS) {
boolean expectSuccess = value >= min && value <= max;
try {
assertEquals(value, UnsignedInteger.valueOf(value).longValue());
assertTrue(expectSuccess);
} catch (IllegalArgumentException e) {
assertFalse(expectSuccess);
}
}
}
public void testValueOfBigInteger() {
long min = 0;
long max = (1L << 32) - 1;
for (long value : TEST_LONGS) {
boolean expectSuccess = value >= min && value <= max;
try {
assertEquals(value, UnsignedInteger.valueOf(BigInteger.valueOf(value))
.longValue());
assertTrue(expectSuccess);
} catch (IllegalArgumentException e) {
assertFalse(expectSuccess);
}
}
}
public void testToString() {
for (int value : TEST_INTS) {
UnsignedInteger unsignedValue = UnsignedInteger.fromIntBits(value);
assertEquals(unsignedValue.bigIntegerValue().toString(), unsignedValue.toString());
}
}
@GwtIncompatible // too slow
public void testToStringRadix() {
for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
for (int l : TEST_INTS) {
UnsignedInteger value = UnsignedInteger.fromIntBits(l);
assertEquals(value.bigIntegerValue().toString(radix), value.toString(radix));
}
}
}
public void testToStringRadixQuick() {
int[] radices = {2, 3, 5, 7, 10, 12, 16, 21, 31, 36};
for (int radix : radices) {
for (int l : TEST_INTS) {
UnsignedInteger value = UnsignedInteger.fromIntBits(l);
assertEquals(value.bigIntegerValue().toString(radix), value.toString(radix));
}
}
}
public void testFloatValue() {
for (int value : TEST_INTS) {
UnsignedInteger unsignedValue = UnsignedInteger.fromIntBits(value);
assertEquals(unsignedValue.bigIntegerValue().floatValue(), unsignedValue.floatValue());
}
}
public void testDoubleValue() {
for (int value : TEST_INTS) {
UnsignedInteger unsignedValue = UnsignedInteger.fromIntBits(value);
assertEquals(unsignedValue.bigIntegerValue().doubleValue(), unsignedValue.doubleValue());
}
}
public void testPlus() {
for (int a : TEST_INTS) {
for (int b : TEST_INTS) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
UnsignedInteger bUnsigned = UnsignedInteger.fromIntBits(b);
int expected = aUnsigned.bigIntegerValue().add(bUnsigned.bigIntegerValue()).intValue();
UnsignedInteger unsignedSum = aUnsigned.plus(bUnsigned);
assertEquals(expected, unsignedSum.intValue());
}
}
}
public void testMinus() {
for (int a : TEST_INTS) {
for (int b : TEST_INTS) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
UnsignedInteger bUnsigned = UnsignedInteger.fromIntBits(b);
int expected =
force32(aUnsigned.bigIntegerValue().subtract(bUnsigned.bigIntegerValue()).intValue());
UnsignedInteger unsignedSub = aUnsigned.minus(bUnsigned);
assertEquals(expected, unsignedSub.intValue());
}
}
}
@GwtIncompatible // multiply
public void testTimes() {
for (int a : TEST_INTS) {
for (int b : TEST_INTS) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
UnsignedInteger bUnsigned = UnsignedInteger.fromIntBits(b);
int expected =
force32(aUnsigned.bigIntegerValue().multiply(bUnsigned.bigIntegerValue()).intValue());
UnsignedInteger unsignedMul = aUnsigned.times(bUnsigned);
assertEquals(aUnsigned + " * " + bUnsigned, expected, unsignedMul.intValue());
}
}
}
public void testDividedBy() {
for (int a : TEST_INTS) {
for (int b : TEST_INTS) {
if (b != 0) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
UnsignedInteger bUnsigned = UnsignedInteger.fromIntBits(b);
int expected =
aUnsigned.bigIntegerValue().divide(bUnsigned.bigIntegerValue()).intValue();
UnsignedInteger unsignedDiv = aUnsigned.dividedBy(bUnsigned);
assertEquals(expected, unsignedDiv.intValue());
}
}
}
}
public void testDivideByZeroThrows() {
for (int a : TEST_INTS) {
try {
UnsignedInteger unused =
UnsignedInteger.fromIntBits(a).dividedBy(UnsignedInteger.ZERO);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
public void testMod() {
for (int a : TEST_INTS) {
for (int b : TEST_INTS) {
if (b != 0) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
UnsignedInteger bUnsigned = UnsignedInteger.fromIntBits(b);
int expected =
aUnsigned.bigIntegerValue().mod(bUnsigned.bigIntegerValue()).intValue();
UnsignedInteger unsignedRem = aUnsigned.mod(bUnsigned);
assertEquals(expected, unsignedRem.intValue());
}
}
}
}
public void testModByZero() {
for (int a : TEST_INTS) {
try {
UnsignedInteger.fromIntBits(a).mod(UnsignedInteger.ZERO);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
public void testCompare() {
for (int a : TEST_INTS) {
for (int b : TEST_INTS) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
UnsignedInteger bUnsigned = UnsignedInteger.fromIntBits(b);
assertEquals(aUnsigned.bigIntegerValue().compareTo(bUnsigned.bigIntegerValue()),
aUnsigned.compareTo(bUnsigned));
}
}
}
@GwtIncompatible // too slow
public void testEquals() {
EqualsTester equalsTester = new EqualsTester();
for (int a : TEST_INTS) {
long value = a & 0xffffffffL;
equalsTester.addEqualityGroup(UnsignedInteger.fromIntBits(a), UnsignedInteger.valueOf(value),
UnsignedInteger.valueOf(Long.toString(value)),
UnsignedInteger.valueOf(Long.toString(value, 16), 16));
}
equalsTester.testEquals();
}
public void testIntValue() {
for (int a : TEST_INTS) {
UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);
int intValue = aUnsigned.bigIntegerValue().intValue();
assertEquals(intValue, aUnsigned.intValue());
}
}
@GwtIncompatible // serialization
public void testSerialization() {
for (int a : TEST_INTS) {
SerializableTester.reserializeAndAssert(UnsignedInteger.fromIntBits(a));
}
}
@GwtIncompatible // NullPointerTester
public void testNulls() {
new NullPointerTester().testAllPublicStaticMethods(UnsignedInteger.class);
}
}