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Java example source code file (BooleansTest.java)

This example Java source code file (BooleansTest.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

array_false, array_false_false, array_false_true, array_true, booleanstest, comparator, empty, gwtincompatible, illegalargumentexception, list, nullpointerexception, serializabletester, testcase, util, values

The BooleansTest.java Java example source code

/*
 * 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 junit.framework.TestCase;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * Unit test for {@link Booleans}.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible(emulated = true)
public class BooleansTest extends TestCase {
  private static final boolean[] EMPTY = {};
  private static final boolean[] ARRAY_FALSE = {false};
  private static final boolean[] ARRAY_TRUE = {true};
  private static final boolean[] ARRAY_FALSE_FALSE = {false, false};
  private static final boolean[] ARRAY_FALSE_TRUE = {false, true};

  private static final boolean[] VALUES = {false, true};

  public void testHashCode() {
    assertEquals(Boolean.TRUE.hashCode(), Booleans.hashCode(true));
    assertEquals(Boolean.FALSE.hashCode(), Booleans.hashCode(false));
  }

  public void testCompare() {
    for (boolean x : VALUES) {
      for (boolean y : VALUES) {
        // note: spec requires only that the sign is the same
        assertEquals(x + ", " + y,
                     Boolean.valueOf(x).compareTo(y),
                     Booleans.compare(x, y));
      }
    }
  }

  public void testContains() {
    assertFalse(Booleans.contains(EMPTY, false));
    assertFalse(Booleans.contains(ARRAY_FALSE, true));
    assertTrue(Booleans.contains(ARRAY_FALSE, false));
    assertTrue(Booleans.contains(ARRAY_FALSE_TRUE, false));
    assertTrue(Booleans.contains(ARRAY_FALSE_TRUE, true));
  }

  public void testIndexOf() {
    assertEquals(-1, Booleans.indexOf(EMPTY, ARRAY_FALSE));
    assertEquals(-1, Booleans.indexOf(ARRAY_FALSE, ARRAY_FALSE_TRUE));
    assertEquals(0, Booleans.indexOf(ARRAY_FALSE_FALSE, ARRAY_FALSE));
    assertEquals(0, Booleans.indexOf(ARRAY_FALSE, ARRAY_FALSE));
    assertEquals(0, Booleans.indexOf(ARRAY_FALSE_TRUE, ARRAY_FALSE));
    assertEquals(1, Booleans.indexOf(ARRAY_FALSE_TRUE, ARRAY_TRUE));
    assertEquals(0, Booleans.indexOf(ARRAY_TRUE, new boolean[0]));
  }

  public void testIndexOf_arrays() {
    assertEquals(-1, Booleans.indexOf(EMPTY, false));
    assertEquals(-1, Booleans.indexOf(ARRAY_FALSE, true));
    assertEquals(-1, Booleans.indexOf(ARRAY_FALSE_FALSE, true));
    assertEquals(0, Booleans.indexOf(ARRAY_FALSE, false));
    assertEquals(0, Booleans.indexOf(ARRAY_FALSE_TRUE, false));
    assertEquals(1, Booleans.indexOf(ARRAY_FALSE_TRUE, true));
    assertEquals(2, Booleans.indexOf(new boolean[] {false, false, true}, true));
  }

  public void testLastIndexOf() {
    assertEquals(-1, Booleans.lastIndexOf(EMPTY, false));
    assertEquals(-1, Booleans.lastIndexOf(ARRAY_FALSE, true));
    assertEquals(-1, Booleans.lastIndexOf(ARRAY_FALSE_FALSE, true));
    assertEquals(0, Booleans.lastIndexOf(ARRAY_FALSE, false));
    assertEquals(0, Booleans.lastIndexOf(ARRAY_FALSE_TRUE, false));
    assertEquals(1, Booleans.lastIndexOf(ARRAY_FALSE_TRUE, true));
    assertEquals(2, Booleans.lastIndexOf(new boolean[] {false, true, true}, true));
  }

  public void testConcat() {
    assertTrue(Arrays.equals(EMPTY, Booleans.concat()));
    assertTrue(Arrays.equals(EMPTY, Booleans.concat(EMPTY)));
    assertTrue(Arrays.equals(EMPTY, Booleans.concat(EMPTY, EMPTY, EMPTY)));
    assertTrue(Arrays.equals(ARRAY_FALSE, Booleans.concat(ARRAY_FALSE)));
    assertNotSame(ARRAY_FALSE, Booleans.concat(ARRAY_FALSE));
    assertTrue(Arrays.equals(ARRAY_FALSE, Booleans.concat(EMPTY, ARRAY_FALSE, EMPTY)));
    assertTrue(Arrays.equals(
        new boolean[] {false, false, false},
        Booleans.concat(ARRAY_FALSE, ARRAY_FALSE, ARRAY_FALSE)));
    assertTrue(Arrays.equals(
        new boolean[] {false, false, true},
        Booleans.concat(ARRAY_FALSE, ARRAY_FALSE_TRUE)));
  }

  public void testEnsureCapacity() {
    assertSame(EMPTY, Booleans.ensureCapacity(EMPTY, 0, 1));
    assertSame(ARRAY_FALSE, Booleans.ensureCapacity(ARRAY_FALSE, 0, 1));
    assertSame(ARRAY_FALSE, Booleans.ensureCapacity(ARRAY_FALSE, 1, 1));
    assertTrue(Arrays.equals(
        new boolean[] {true, false, false},
        Booleans.ensureCapacity(new boolean[] {true}, 2, 1)));
  }

  public void testEnsureCapacity_fail() {
    try {
      Booleans.ensureCapacity(ARRAY_FALSE, -1, 1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
    try {
      // notice that this should even fail when no growth was needed
      Booleans.ensureCapacity(ARRAY_FALSE, 1, -1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  public void testJoin() {
    assertEquals("", Booleans.join(",", EMPTY));
    assertEquals("false", Booleans.join(",", ARRAY_FALSE));
    assertEquals("false,true", Booleans.join(",", false, true));
    assertEquals("falsetruefalse",
        Booleans.join("", false, true, false));
  }

  public void testLexicographicalComparator() {
    List<boolean[]> ordered = Arrays.asList(
        new boolean[] {},
        new boolean[] {false},
        new boolean[] {false, false},
        new boolean[] {false, true},
        new boolean[] {true},
        new boolean[] {true, false},
        new boolean[] {true, true},
        new boolean[] {true, true, true});

    Comparator<boolean[]> comparator = Booleans.lexicographicalComparator();
    Helpers.testComparator(comparator, ordered);
  }

  @GwtIncompatible // SerializableTester
  public void testLexicographicalComparatorSerializable() {
    Comparator<boolean[]> comparator = Booleans.lexicographicalComparator();
    assertSame(comparator, SerializableTester.reserialize(comparator));
  }

  public void testToArray() {
    // need explicit type parameter to avoid javac warning!?
    List<Boolean> none = Arrays.asList();
    assertTrue(Arrays.equals(EMPTY, Booleans.toArray(none)));

    List<Boolean> one = Arrays.asList(false);
    assertTrue(Arrays.equals(ARRAY_FALSE, Booleans.toArray(one)));

    boolean[] array = {false, false, true};

    List<Boolean> three = Arrays.asList(false, false, true);
    assertTrue(Arrays.equals(array, Booleans.toArray(three)));

    assertTrue(Arrays.equals(array, Booleans.toArray(Booleans.asList(array))));
  }

  public void testToArray_threadSafe() {
    // Only for booleans, we lengthen VALUES
    boolean[] VALUES = BooleansTest.VALUES;
    VALUES = Booleans.concat(VALUES, VALUES);

    for (int delta : new int[] { +1, 0, -1 }) {
      for (int i = 0; i < VALUES.length; i++) {
        List<Boolean> list = Booleans.asList(VALUES).subList(0, i);
        Collection<Boolean> misleadingSize =
            Helpers.misleadingSizeCollection(delta);
        misleadingSize.addAll(list);
        boolean[] arr = Booleans.toArray(misleadingSize);
        assertEquals(i, arr.length);
        for (int j = 0; j < i; j++) {
          assertEquals(VALUES[j], arr[j]);
        }
      }
    }
  }

  public void testToArray_withNull() {
    List<Boolean> list = Arrays.asList(false, true, null);
    try {
      Booleans.toArray(list);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testAsListIsEmpty() {
    assertTrue(Booleans.asList(EMPTY).isEmpty());
    assertFalse(Booleans.asList(ARRAY_FALSE).isEmpty());
  }

  public void testAsListSize() {
    assertEquals(0, Booleans.asList(EMPTY).size());
    assertEquals(1, Booleans.asList(ARRAY_FALSE).size());
    assertEquals(2, Booleans.asList(ARRAY_FALSE_TRUE).size());
  }

  public void testAsListIndexOf() {
    assertEquals(-1, Booleans.asList(EMPTY).indexOf((Object) "wrong type"));
    assertEquals(-1, Booleans.asList(EMPTY).indexOf(true));
    assertEquals(-1, Booleans.asList(ARRAY_FALSE).indexOf(true));
    assertEquals(0, Booleans.asList(ARRAY_FALSE).indexOf(false));
    assertEquals(1, Booleans.asList(ARRAY_FALSE_TRUE).indexOf(true));
  }

  public void testAsListLastIndexOf() {
    assertEquals(-1, Booleans.asList(EMPTY).lastIndexOf((Object) "wrong type"));
    assertEquals(-1, Booleans.asList(EMPTY).lastIndexOf(true));
    assertEquals(-1, Booleans.asList(ARRAY_FALSE).lastIndexOf(true));
    assertEquals(1, Booleans.asList(ARRAY_FALSE_TRUE).lastIndexOf(true));
    assertEquals(1, Booleans.asList(ARRAY_FALSE_FALSE).lastIndexOf(false));
  }

  public void testAsListContains() {
    assertFalse(Booleans.asList(EMPTY).contains((Object) "wrong type"));
    assertFalse(Booleans.asList(EMPTY).contains(true));
    assertFalse(Booleans.asList(ARRAY_FALSE).contains(true));
    assertTrue(Booleans.asList(ARRAY_TRUE).contains(true));
    assertTrue(Booleans.asList(ARRAY_FALSE_TRUE).contains(false));
    assertTrue(Booleans.asList(ARRAY_FALSE_TRUE).contains(true));
  }

  public void testAsListEquals() {
    assertEquals(Booleans.asList(EMPTY), Collections.emptyList());
    assertEquals(Booleans.asList(ARRAY_FALSE), Booleans.asList(ARRAY_FALSE));
    assertFalse(Booleans.asList(ARRAY_FALSE).equals(ARRAY_FALSE));
    assertFalse(Booleans.asList(ARRAY_FALSE).equals(null));
    assertFalse(Booleans.asList(ARRAY_FALSE).equals(Booleans.asList(ARRAY_FALSE_TRUE)));
    assertFalse(Booleans.asList(ARRAY_FALSE_FALSE).equals(Booleans.asList(ARRAY_FALSE_TRUE)));
    assertEquals(1, Booleans.asList(ARRAY_FALSE_TRUE).lastIndexOf(true));
    List<Boolean> reference = Booleans.asList(ARRAY_FALSE);
    assertEquals(Booleans.asList(ARRAY_FALSE), reference);
    assertEquals(reference, reference);
  }

  public void testAsListHashcode() {
    assertEquals(1, Booleans.asList(EMPTY).hashCode());
    assertEquals(Booleans.asList(ARRAY_FALSE).hashCode(), Booleans.asList(ARRAY_FALSE).hashCode());
    List<Boolean> reference = Booleans.asList(ARRAY_FALSE);
    assertEquals(Booleans.asList(ARRAY_FALSE).hashCode(), reference.hashCode());
  }

  public void testAsListToString() {
    assertEquals("[false]", Booleans.asList(ARRAY_FALSE).toString());
    assertEquals("[false, true]", Booleans.asList(ARRAY_FALSE_TRUE).toString());
  }

  public void testAsListSet() {
    List<Boolean> list = Booleans.asList(ARRAY_FALSE);
    assertFalse(list.set(0, true));
    assertTrue(list.set(0, false));
    try {
      list.set(0, null);
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      list.set(1, true);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
  }

  public void testCountTrue() {
    assertEquals(0, Booleans.countTrue());
    assertEquals(0, Booleans.countTrue(false));
    assertEquals(1, Booleans.countTrue(true));
    assertEquals(3, Booleans.countTrue(false, true, false, true, false, true));
    assertEquals(1, Booleans.countTrue(false, false, true, false, false));
  }

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

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