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Java example source code file (UnsignedIntegerTest.java)

This example Java source code file (UnsignedIntegerTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arithmeticexception, equalstester, expected, gwtcompatible, gwtincompatible, illegalargumentexception, immutableset, math, nullpointertester, test_ints, test_longs, testcase, unsignedinteger, unsignedintegertest

The UnsignedIntegerTest.java Java example source code

/*
 * 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 junit.framework.TestCase;

import java.math.BigInteger;

/**
 * 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);
  }
}

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