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Java example source code file (ArbitraryInstancesTest.java)

This example Java source code file (ArbitraryInstancesTest.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

firstconstantisnull, instance, nio, nonfinalfieldignored, nonpublicconstantignored, nonstaticfieldignored, reflection, regex, second, someabstractclass, suppresswarnings, threading, threads, util, withexceptionalconstructor, withgenericconstant, withnullconstant, withprivateconstructor, withpublicconstants, withpublicconstructorandconstant

The ArbitraryInstancesTest.java Java example source code

/*
 * Copyright (C) 2012 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.testing;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.base.CharMatcher;
import com.google.common.base.Charsets;
import com.google.common.base.Equivalence;
import com.google.common.base.Joiner;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.base.Splitter;
import com.google.common.base.Stopwatch;
import com.google.common.base.Ticker;
import com.google.common.collect.BiMap;
import com.google.common.collect.ClassToInstanceMap;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableClassToInstanceMap;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableMultiset;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.ImmutableTable;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.MapConstraint;
import com.google.common.collect.MapDifference;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multiset;
import com.google.common.collect.PeekingIterator;
import com.google.common.collect.Range;
import com.google.common.collect.RowSortedTable;
import com.google.common.collect.SetMultimap;
import com.google.common.collect.SortedMapDifference;
import com.google.common.collect.SortedMultiset;
import com.google.common.collect.SortedSetMultimap;
import com.google.common.collect.Table;
import com.google.common.io.ByteSink;
import com.google.common.io.ByteSource;
import com.google.common.io.CharSink;
import com.google.common.io.CharSource;
import com.google.common.primitives.UnsignedInteger;
import com.google.common.primitives.UnsignedLong;
import com.google.common.util.concurrent.AtomicDouble;

import junit.framework.TestCase;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.LongBuffer;
import java.nio.ShortBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Collection;
import java.util.Comparator;
import java.util.Currency;
import java.util.Deque;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.Locale;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Random;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.BlockingDeque;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.PriorityBlockingQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;

/**
 * Unit test for {@link ArbitraryInstances}.
 *
 * @author Ben Yu
 */
public class ArbitraryInstancesTest extends TestCase {

  public void testGet_primitives() {
    assertNull(ArbitraryInstances.get(void.class));
    assertNull(ArbitraryInstances.get(Void.class));
    assertEquals(Boolean.FALSE, ArbitraryInstances.get(boolean.class));
    assertEquals(Boolean.FALSE, ArbitraryInstances.get(Boolean.class));
    assertEquals(Character.valueOf('\0'), ArbitraryInstances.get(char.class));
    assertEquals(Character.valueOf('\0'), ArbitraryInstances.get(Character.class));
    assertEquals(Byte.valueOf((byte) 0), ArbitraryInstances.get(byte.class));
    assertEquals(Byte.valueOf((byte) 0), ArbitraryInstances.get(Byte.class));
    assertEquals(Short.valueOf((short) 0), ArbitraryInstances.get(short.class));
    assertEquals(Short.valueOf((short) 0), ArbitraryInstances.get(Short.class));
    assertEquals(Integer.valueOf(0), ArbitraryInstances.get(int.class));
    assertEquals(Integer.valueOf(0), ArbitraryInstances.get(Integer.class));
    assertEquals(Long.valueOf(0), ArbitraryInstances.get(long.class));
    assertEquals(Long.valueOf(0), ArbitraryInstances.get(Long.class));
    assertEquals(Float.valueOf(0), ArbitraryInstances.get(float.class));
    assertEquals(Float.valueOf(0), ArbitraryInstances.get(Float.class));
    assertEquals(Double.valueOf(0), ArbitraryInstances.get(double.class));
    assertEquals(Double.valueOf(0), ArbitraryInstances.get(Double.class));
    assertEquals(UnsignedInteger.ZERO, ArbitraryInstances.get(UnsignedInteger.class));
    assertEquals(UnsignedLong.ZERO, ArbitraryInstances.get(UnsignedLong.class));
    assertEquals(0, ArbitraryInstances.get(BigDecimal.class).intValue());
    assertEquals(0, ArbitraryInstances.get(BigInteger.class).intValue());
    assertEquals("", ArbitraryInstances.get(String.class));
    assertEquals("", ArbitraryInstances.get(CharSequence.class));
    assertEquals(TimeUnit.SECONDS, ArbitraryInstances.get(TimeUnit.class));
    assertNotNull(ArbitraryInstances.get(Object.class));
    assertEquals(0, ArbitraryInstances.get(Number.class));
    assertEquals(Charsets.UTF_8, ArbitraryInstances.get(Charset.class));
  }

  public void testGet_collections() {
    assertEquals(ImmutableSet.of().iterator(), ArbitraryInstances.get(Iterator.class));
    assertFalse(ArbitraryInstances.get(PeekingIterator.class).hasNext());
    assertFalse(ArbitraryInstances.get(ListIterator.class).hasNext());
    assertEquals(ImmutableSet.of(), ArbitraryInstances.get(Iterable.class));
    assertEquals(ImmutableSet.of(), ArbitraryInstances.get(Set.class));
    assertEquals(ImmutableSet.of(), ArbitraryInstances.get(ImmutableSet.class));
    assertEquals(ImmutableSortedSet.of(), ArbitraryInstances.get(SortedSet.class));
    assertEquals(ImmutableSortedSet.of(), ArbitraryInstances.get(ImmutableSortedSet.class));
    assertEquals(ImmutableList.of(), ArbitraryInstances.get(Collection.class));
    assertEquals(ImmutableList.of(), ArbitraryInstances.get(ImmutableCollection.class));
    assertEquals(ImmutableList.of(), ArbitraryInstances.get(List.class));
    assertEquals(ImmutableList.of(), ArbitraryInstances.get(ImmutableList.class));
    assertEquals(ImmutableMap.of(), ArbitraryInstances.get(Map.class));
    assertEquals(ImmutableMap.of(), ArbitraryInstances.get(ImmutableMap.class));
    assertEquals(ImmutableSortedMap.of(), ArbitraryInstances.get(SortedMap.class));
    assertEquals(ImmutableSortedMap.of(), ArbitraryInstances.get(ImmutableSortedMap.class));
    assertEquals(ImmutableMultiset.of(), ArbitraryInstances.get(Multiset.class));
    assertEquals(ImmutableMultiset.of(), ArbitraryInstances.get(ImmutableMultiset.class));
    assertTrue(ArbitraryInstances.get(SortedMultiset.class).isEmpty());
    assertEquals(ImmutableMultimap.of(), ArbitraryInstances.get(Multimap.class));
    assertEquals(ImmutableMultimap.of(), ArbitraryInstances.get(ImmutableMultimap.class));
    assertTrue(ArbitraryInstances.get(SortedSetMultimap.class).isEmpty());
    assertEquals(ImmutableTable.of(), ArbitraryInstances.get(Table.class));
    assertEquals(ImmutableTable.of(), ArbitraryInstances.get(ImmutableTable.class));
    assertTrue(ArbitraryInstances.get(RowSortedTable.class).isEmpty());
    assertEquals(ImmutableBiMap.of(), ArbitraryInstances.get(BiMap.class));
    assertEquals(ImmutableBiMap.of(), ArbitraryInstances.get(ImmutableBiMap.class));
    assertTrue(ArbitraryInstances.get(ImmutableClassToInstanceMap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(ClassToInstanceMap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(ListMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(ImmutableListMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(SetMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(ImmutableSetMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(MapDifference.class).areEqual());
    assertTrue(ArbitraryInstances.get(SortedMapDifference.class).areEqual());
    assertEquals(Range.all(), ArbitraryInstances.get(Range.class));
    assertTrue(ArbitraryInstances.get(NavigableSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(NavigableMap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(LinkedList.class).isEmpty());
    assertTrue(ArbitraryInstances.get(Deque.class).isEmpty());
    assertTrue(ArbitraryInstances.get(Queue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(PriorityQueue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(BitSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(TreeSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(TreeMap.class).isEmpty());
    assertFreshInstanceReturned(
        LinkedList.class, Deque.class, Queue.class, PriorityQueue.class, BitSet.class,
        TreeSet.class, TreeMap.class);
  }

  public void testGet_misc() {
    assertNotNull(ArbitraryInstances.get(CharMatcher.class));
    assertNotNull(ArbitraryInstances.get(Currency.class).getCurrencyCode());
    assertNotNull(ArbitraryInstances.get(Locale.class));
    assertNotNull(ArbitraryInstances.get(Joiner.class).join(ImmutableList.of("a")));
    assertNotNull(ArbitraryInstances.get(Splitter.class).split("a,b"));
    assertThat(ArbitraryInstances.get(Optional.class)).isAbsent();
    ArbitraryInstances.get(Stopwatch.class).start();
    assertNotNull(ArbitraryInstances.get(Ticker.class));
    assertNotNull(ArbitraryInstances.get(MapConstraint.class));
    assertFreshInstanceReturned(Random.class);
    assertEquals(ArbitraryInstances.get(Random.class).nextInt(),
        ArbitraryInstances.get(Random.class).nextInt());
  }

  public void testGet_concurrent() {
    assertTrue(ArbitraryInstances.get(BlockingDeque.class).isEmpty());
    assertTrue(ArbitraryInstances.get(BlockingQueue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(DelayQueue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(SynchronousQueue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(PriorityBlockingQueue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(ConcurrentMap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(ConcurrentNavigableMap.class).isEmpty());
    ArbitraryInstances.get(Executor.class).execute(ArbitraryInstances.get(Runnable.class));
    assertNotNull(ArbitraryInstances.get(ThreadFactory.class));
    assertFreshInstanceReturned(
        BlockingQueue.class, BlockingDeque.class, PriorityBlockingQueue.class,
        DelayQueue.class, SynchronousQueue.class,
        ConcurrentMap.class, ConcurrentNavigableMap.class,
        AtomicReference.class, AtomicBoolean.class,
        AtomicInteger.class, AtomicLong.class, AtomicDouble.class);
  }

  @SuppressWarnings("unchecked") // functor classes have no type parameters
  public void testGet_functors() {
    assertEquals(0, ArbitraryInstances.get(Comparator.class).compare("abc", 123));
    assertTrue(ArbitraryInstances.get(Predicate.class).apply("abc"));
    assertTrue(ArbitraryInstances.get(Equivalence.class).equivalent(1, 1));
    assertFalse(ArbitraryInstances.get(Equivalence.class).equivalent(1, 2));
  }

  public void testGet_comparable() {
    @SuppressWarnings("unchecked") // The null value can compare with any Object
    Comparable<Object> comparable = ArbitraryInstances.get(Comparable.class);
    assertEquals(0, comparable.compareTo(comparable));
    assertTrue(comparable.compareTo("") > 0);
    try {
      comparable.compareTo(null);
      fail();
    } catch (NullPointerException expected) {}
  }

  public void testGet_array() {
    assertThat(ArbitraryInstances.get(int[].class)).isEmpty();
    assertThat(ArbitraryInstances.get(Object[].class)).isEmpty();
    assertThat(ArbitraryInstances.get(String[].class)).isEmpty();
  }

  public void testGet_enum() {
    assertNull(ArbitraryInstances.get(EmptyEnum.class));
    assertEquals(Direction.UP, ArbitraryInstances.get(Direction.class));
  }

  public void testGet_interface() {
    assertNull(ArbitraryInstances.get(SomeInterface.class));
  }

  public void testGet_runnable() {
    ArbitraryInstances.get(Runnable.class).run();
  }

  public void testGet_class() {
    assertSame(SomeAbstractClass.INSTANCE, ArbitraryInstances.get(SomeAbstractClass.class));
    assertSame(WithPrivateConstructor.INSTANCE,
        ArbitraryInstances.get(WithPrivateConstructor.class));
    assertNull(ArbitraryInstances.get(NoDefaultConstructor.class));
    assertSame(WithExceptionalConstructor.INSTANCE,
        ArbitraryInstances.get(WithExceptionalConstructor.class));
    assertNull(ArbitraryInstances.get(NonPublicClass.class));
  }

  public void testGet_mutable() {
    assertEquals(0, ArbitraryInstances.get(ArrayList.class).size());
    assertEquals(0, ArbitraryInstances.get(HashMap.class).size());
    assertThat(ArbitraryInstances.get(Appendable.class).toString()).isEmpty();
    assertThat(ArbitraryInstances.get(StringBuilder.class).toString()).isEmpty();
    assertThat(ArbitraryInstances.get(StringBuffer.class).toString()).isEmpty();
    assertFreshInstanceReturned(
        ArrayList.class,
        HashMap.class,
        Appendable.class,
        StringBuilder.class,
        StringBuffer.class,
        Throwable.class,
        Exception.class);
  }

  public void testGet_io() throws IOException {
    assertEquals(-1, ArbitraryInstances.get(InputStream.class).read());
    assertEquals(-1, ArbitraryInstances.get(ByteArrayInputStream.class).read());
    assertEquals(-1, ArbitraryInstances.get(Readable.class).read(CharBuffer.allocate(1)));
    assertEquals(-1, ArbitraryInstances.get(Reader.class).read());
    assertEquals(-1, ArbitraryInstances.get(StringReader.class).read());
    assertEquals(0, ArbitraryInstances.get(Buffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(CharBuffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(ByteBuffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(ShortBuffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(IntBuffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(LongBuffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(FloatBuffer.class).capacity());
    assertEquals(0, ArbitraryInstances.get(DoubleBuffer.class).capacity());
    ArbitraryInstances.get(PrintStream.class).println("test");
    ArbitraryInstances.get(PrintWriter.class).println("test");
    assertNotNull(ArbitraryInstances.get(File.class));
    assertFreshInstanceReturned(
        ByteArrayOutputStream.class, OutputStream.class,
        Writer.class, StringWriter.class,
        PrintStream.class, PrintWriter.class);
    assertEquals(ByteSource.empty(), ArbitraryInstances.get(ByteSource.class));
    assertEquals(CharSource.empty(), ArbitraryInstances.get(CharSource.class));
    assertNotNull(ArbitraryInstances.get(ByteSink.class));
    assertNotNull(ArbitraryInstances.get(CharSink.class));
  }

  public void testGet_reflect() {
    assertNotNull(ArbitraryInstances.get(Type.class));
    assertNotNull(ArbitraryInstances.get(AnnotatedElement.class));
    assertNotNull(ArbitraryInstances.get(GenericDeclaration.class));
  }

  public void testGet_regex() {
    assertEquals(Pattern.compile("").pattern(),
        ArbitraryInstances.get(Pattern.class).pattern());
    assertEquals(0, ArbitraryInstances.get(MatchResult.class).groupCount());
  }

  public void testGet_usePublicConstant() {
    assertSame(WithPublicConstant.INSTANCE,
        ArbitraryInstances.get(WithPublicConstant.class));
  }

  public void testGet_useFirstPublicConstant() {
    assertSame(WithPublicConstants.FIRST,
        ArbitraryInstances.get(WithPublicConstants.class));
  }

  public void testGet_nullConstantIgnored() {
    assertSame(FirstConstantIsNull.SECOND,
        ArbitraryInstances.get(FirstConstantIsNull.class));
  }

  public void testGet_constantWithGenericsNotUsed() {
    assertNull(ArbitraryInstances.get(WithGenericConstant.class));
  }

  public void testGet_nullConstant() {
    assertNull(ArbitraryInstances.get(WithNullConstant.class));
  }

  public void testGet_constantTypeDoesNotMatch() {
    assertNull(ArbitraryInstances.get(ParentClassHasConstant.class));
  }

  public void testGet_nonPublicConstantNotUsed() {
    assertNull(ArbitraryInstances.get(NonPublicConstantIgnored.class));
  }

  public void testGet_nonStaticFieldNotUsed() {
    assertNull(ArbitraryInstances.get(NonStaticFieldIgnored.class));
  }

  public void testGet_constructorPreferredOverConstants() {
    assertNotNull(ArbitraryInstances.get(WithPublicConstructorAndConstant.class));
    assertTrue(ArbitraryInstances.get(WithPublicConstructorAndConstant.class)
        != ArbitraryInstances.get(WithPublicConstructorAndConstant.class));
  }

  public void testGet_nonFinalFieldNotUsed() {
    assertNull(ArbitraryInstances.get(NonFinalFieldIgnored.class));
  }

  private static void assertFreshInstanceReturned(Class<?>... mutableClasses) {
    for (Class<?> mutableClass : mutableClasses) {
      Object instance = ArbitraryInstances.get(mutableClass);
      assertNotNull("Expected to return non-null for: " + mutableClass, instance);
      assertNotSame("Expected to return fresh instance for: " + mutableClass,
          instance, ArbitraryInstances.get(mutableClass));
    }
  }

  private enum EmptyEnum {}

  private enum Direction {
    UP, DOWN
  }

  public interface SomeInterface {}

  public static abstract class SomeAbstractClass {
    public static final SomeAbstractClass INSTANCE = new SomeAbstractClass() {};
    public SomeAbstractClass() {}
  }

  static class NonPublicClass {
    public NonPublicClass() {}
  }

  private static class WithPrivateConstructor {
    public static final WithPrivateConstructor INSTANCE = new WithPrivateConstructor();
  }

  public static class NoDefaultConstructor {
    public NoDefaultConstructor(@SuppressWarnings("unused") int i) {}
  }

  public static class WithExceptionalConstructor {
    public static final WithExceptionalConstructor INSTANCE =
        new WithExceptionalConstructor("whatever");

    public WithExceptionalConstructor() {
      throw new RuntimeException();
    }
    private WithExceptionalConstructor(String unused) {}
  }

  private static class WithPublicConstant {
    public static final WithPublicConstant INSTANCE = new WithPublicConstant();
  }

  private static class ParentClassHasConstant
      extends WithPublicConstant {}

  public static class WithGenericConstant<T> {
    public static final WithGenericConstant<String> STRING_CONSTANT =
        new WithGenericConstant<String>();

    private WithGenericConstant() {}
  }

  public static class WithNullConstant {
    public static final WithNullConstant NULL = null;

    private WithNullConstant() {}
  }

  public static class WithPublicConstructorAndConstant {
    public static final WithPublicConstructorAndConstant INSTANCE =
        new WithPublicConstructorAndConstant();

    public WithPublicConstructorAndConstant() {}
  }

  private static class WithPublicConstants {
    public static final WithPublicConstants FIRST = new WithPublicConstants();

    // To test that we pick the first constant alphabetically
    @SuppressWarnings("unused")
    public static final WithPublicConstants SECOND = new WithPublicConstants();
  }

  private static class FirstConstantIsNull {
    // To test that null constant is ignored
    @SuppressWarnings("unused")
    public static final FirstConstantIsNull FIRST = null;
    public static final FirstConstantIsNull SECOND = new FirstConstantIsNull();
  }

  public static class NonFinalFieldIgnored {
    public static NonFinalFieldIgnored instance =
        new NonFinalFieldIgnored();

    private NonFinalFieldIgnored() {}
  }

  public static class NonPublicConstantIgnored {
    static final NonPublicConstantIgnored INSTANCE =
        new NonPublicConstantIgnored();

    private NonPublicConstantIgnored() {}
  }

  public static class NonStaticFieldIgnored {
    // This should cause infinite recursion. But it shouldn't be used anyway.
    public final NonStaticFieldIgnored instance =
        new NonStaticFieldIgnored();

    private NonStaticFieldIgnored() {}
  }
}

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