Java example source code file (UnsignedLongTest.java)

This example Java source code file (UnsignedLongTest.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, biginteger, equalstester, expected, gwtcompatible, gwtincompatible, illegalargumentexception, immutableset, math, nullpointertester, test_big_integers, test_longs, testcase, unsignedlong, unsignedlongtest

The UnsignedLongTest.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 UnsignedLong}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible(emulated = true)
public class UnsignedLongTest extends TestCase {
  private static final ImmutableSet<Long> TEST_LONGS;
  private static final ImmutableSet<BigInteger> TEST_BIG_INTEGERS;

  static {
    ImmutableSet.Builder<Long> testLongsBuilder = ImmutableSet.builder();
    ImmutableSet.Builder<BigInteger> testBigIntegersBuilder = ImmutableSet.builder();
    for (long i = -3; i <= 3; i++) {
      testLongsBuilder
          .add(i)
          .add(Long.MAX_VALUE + i)
          .add(Long.MIN_VALUE + i)
          .add(Integer.MIN_VALUE + i)
          .add(Integer.MAX_VALUE + i);
      BigInteger bigI = BigInteger.valueOf(i);
      testBigIntegersBuilder
          .add(bigI)
          .add(BigInteger.valueOf(Long.MAX_VALUE).add(bigI))
          .add(BigInteger.valueOf(Long.MIN_VALUE).add(bigI))
          .add(BigInteger.valueOf(Integer.MAX_VALUE).add(bigI))
          .add(BigInteger.valueOf(Integer.MIN_VALUE).add(bigI))
          .add(BigInteger.ONE.shiftLeft(63).add(bigI))
          .add(BigInteger.ONE.shiftLeft(64).add(bigI));
    }
    TEST_LONGS = testLongsBuilder.build();
    TEST_BIG_INTEGERS = testBigIntegersBuilder.build();
  }

  public void testAsUnsignedAndLongValueAreInverses() {
    for (long value : TEST_LONGS) {
      assertEquals(
          UnsignedLongs.toString(value), value, UnsignedLong.fromLongBits(value).longValue());
    }
  }

  public void testAsUnsignedBigIntegerValue() {
    for (long value : TEST_LONGS) {
      BigInteger expected = (value >= 0)
          ? BigInteger.valueOf(value)
          : BigInteger.valueOf(value).add(BigInteger.ZERO.setBit(64));
      assertEquals(UnsignedLongs.toString(value), expected,
          UnsignedLong.fromLongBits(value).bigIntegerValue());
    }
  }

  public void testValueOfLong() {
    for (long value : TEST_LONGS) {
      boolean expectSuccess = value >= 0;
      try {
        assertEquals(value, UnsignedLong.valueOf(value).longValue());
        assertTrue(expectSuccess);
      } catch (IllegalArgumentException e) {
        assertFalse(expectSuccess);
      }
    }
  }

  public void testValueOfBigInteger() {
    BigInteger min = BigInteger.ZERO;
    BigInteger max = UnsignedLong.MAX_VALUE.bigIntegerValue();
    for (BigInteger big : TEST_BIG_INTEGERS) {
      boolean expectSuccess =
          big.compareTo(min) >= 0 && big.compareTo(max) <= 0;
      try {
        assertEquals(big, UnsignedLong.valueOf(big).bigIntegerValue());
        assertTrue(expectSuccess);
      } catch (IllegalArgumentException e) {
        assertFalse(expectSuccess);
      }
    }
  }

  public void testToString() {
    for (long value : TEST_LONGS) {
      UnsignedLong unsignedValue = UnsignedLong.fromLongBits(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 (long l : TEST_LONGS) {
        UnsignedLong value = UnsignedLong.fromLongBits(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 (long l : TEST_LONGS) {
        UnsignedLong value = UnsignedLong.fromLongBits(l);
        assertEquals(value.bigIntegerValue().toString(radix), value.toString(radix));
      }
    }
  }

  public void testFloatValue() {
    for (long value : TEST_LONGS) {
      UnsignedLong unsignedValue = UnsignedLong.fromLongBits(value);
      assertEquals(unsignedValue.bigIntegerValue().floatValue(), unsignedValue.floatValue());
    }
  }

  public void testDoubleValue() {
    for (long value : TEST_LONGS) {
      UnsignedLong unsignedValue = UnsignedLong.fromLongBits(value);
      assertEquals(unsignedValue.bigIntegerValue().doubleValue(), unsignedValue.doubleValue());
    }
  }

  public void testPlus() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
        UnsignedLong bUnsigned = UnsignedLong.fromLongBits(b);
        long expected = aUnsigned
            .bigIntegerValue()
            .add(bUnsigned.bigIntegerValue())
            .longValue();
        UnsignedLong unsignedSum = aUnsigned.plus(bUnsigned);
        assertEquals(expected, unsignedSum.longValue());
      }
    }
  }

  public void testMinus() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
        UnsignedLong bUnsigned = UnsignedLong.fromLongBits(b);
        long expected = aUnsigned
            .bigIntegerValue()
            .subtract(bUnsigned.bigIntegerValue())
            .longValue();
        UnsignedLong unsignedSub = aUnsigned.minus(bUnsigned);
        assertEquals(expected, unsignedSub.longValue());
      }
    }
  }

  public void testTimes() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
        UnsignedLong bUnsigned = UnsignedLong.fromLongBits(b);
        long expected = aUnsigned
            .bigIntegerValue()
            .multiply(bUnsigned.bigIntegerValue())
            .longValue();
        UnsignedLong unsignedMul = aUnsigned.times(bUnsigned);
        assertEquals(expected, unsignedMul.longValue());
      }
    }
  }

  public void testDividedBy() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        if (b != 0) {
          UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
          UnsignedLong bUnsigned = UnsignedLong.fromLongBits(b);
          long expected = aUnsigned
              .bigIntegerValue()
              .divide(bUnsigned.bigIntegerValue())
              .longValue();
          UnsignedLong unsignedDiv = aUnsigned.dividedBy(bUnsigned);
          assertEquals(expected, unsignedDiv.longValue());
        }
      }
    }
  }

  public void testDivideByZeroThrows() {
    for (long a : TEST_LONGS) {
      try {
        UnsignedLong.fromLongBits(a).dividedBy(UnsignedLong.ZERO);
        fail("Expected ArithmeticException");
      } catch (ArithmeticException expected) {}
    }
  }

  public void testMod() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        if (b != 0) {
          UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
          UnsignedLong bUnsigned = UnsignedLong.fromLongBits(b);
          long expected = aUnsigned
              .bigIntegerValue()
              .remainder(bUnsigned.bigIntegerValue())
              .longValue();
          UnsignedLong unsignedRem = aUnsigned.mod(bUnsigned);
          assertEquals(expected, unsignedRem.longValue());
        }
      }
    }
  }

  public void testModByZero() {
    for (long a : TEST_LONGS) {
      try {
        UnsignedLong.fromLongBits(a).mod(UnsignedLong.ZERO);
        fail("Expected ArithmeticException");
      } catch (ArithmeticException expected) {}
    }
  }

  public void testCompare() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
        UnsignedLong bUnsigned = UnsignedLong.fromLongBits(b);
        assertEquals(aUnsigned.bigIntegerValue().compareTo(bUnsigned.bigIntegerValue()),
            aUnsigned.compareTo(bUnsigned));
      }
    }
  }

  @GwtIncompatible // too slow
  public void testEquals() {
    EqualsTester equalsTester = new EqualsTester();
    for (long a : TEST_LONGS) {
      BigInteger big =
          (a >= 0) ? BigInteger.valueOf(a) : BigInteger.valueOf(a).add(BigInteger.ZERO.setBit(64));
      equalsTester.addEqualityGroup(UnsignedLong.fromLongBits(a), UnsignedLong.valueOf(big),
          UnsignedLong.valueOf(big.toString()), UnsignedLong.valueOf(big.toString(16), 16));
    }
    equalsTester.testEquals();
  }

  public void testIntValue() {
    for (long a : TEST_LONGS) {
      UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);
      int intValue = aUnsigned.bigIntegerValue().intValue();
      assertEquals(intValue, aUnsigned.intValue());
    }
  }

  @GwtIncompatible // serialization
  public void testSerialization() {
    for (long a : TEST_LONGS) {
      SerializableTester.reserializeAndAssert(UnsignedLong.fromLongBits(a));
    }
  }

  @GwtIncompatible // NullPointerTester
  public void testNulls() {
    new NullPointerTester().testAllPublicStaticMethods(UnsignedLong.class);
  }
}