Java example source code file (FreshValueGeneratorTest.java)

This example Java source code file (FreshValueGeneratorTest.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.

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Java - Java tags/keywords

androidincompatible, class, classsanitytester, constant1, constant2, equalstester, freshvaluegenerator, freshvaluegeneratortest, immutablelist, integer, math, nio, object, oneconstantenum, reflection, string, threading, threads, typetoken, util

The FreshValueGeneratorTest.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 com.google.common.base.CharMatcher;
import com.google.common.base.Equivalence;
import com.google.common.base.Function;
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.Ticker;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableBiMap;
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.ImmutableSortedMultiset;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.ImmutableTable;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.LinkedHashMultiset;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multiset;
import com.google.common.collect.Ordering;
import com.google.common.collect.Range;
import com.google.common.collect.RowSortedTable;
import com.google.common.collect.SetMultimap;
import com.google.common.collect.SortedMultiset;
import com.google.common.collect.Table;
import com.google.common.collect.TreeBasedTable;
import com.google.common.collect.TreeMultiset;
import com.google.common.primitives.UnsignedInteger;
import com.google.common.primitives.UnsignedLong;
import com.google.common.reflect.TypeToken;

import junit.framework.TestCase;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Method;
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.Collection;
import java.util.Comparator;
import java.util.Currency;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;

/**
 * Tests for {@link FreshValueGenerator}.
 *
 * @author Ben Yu
 */
public class FreshValueGeneratorTest extends TestCase {

  @AndroidIncompatible // problem with equality of Type objects?
  public void testFreshInstance() {
    assertFreshInstances(
        String.class, CharSequence.class,
        Appendable.class, StringBuffer.class, StringBuilder.class,
        Pattern.class, MatchResult.class,
        Number.class, int.class, Integer.class,
        long.class, Long.class,
        short.class, Short.class,
        byte.class, Byte.class,
        boolean.class, Boolean.class,
        char.class, Character.class,
        int[].class, Object[].class,
        UnsignedInteger.class, UnsignedLong.class,
        BigInteger.class, BigDecimal.class,
        Throwable.class, Error.class, Exception.class, RuntimeException.class,
        Charset.class, Locale.class, Currency.class,
        List.class, Map.Entry.class,
        Object.class,
        Equivalence.class, Predicate.class, Function.class,
        Comparable.class, Comparator.class, Ordering.class,
        Class.class, Type.class, TypeToken.class,
        TimeUnit.class, Ticker.class,
        Joiner.class, Splitter.class, CharMatcher.class,
        InputStream.class, ByteArrayInputStream.class,
        Reader.class, Readable.class, StringReader.class,
        OutputStream.class, ByteArrayOutputStream.class,
        Writer.class, StringWriter.class, File.class,
        Buffer.class, ByteBuffer.class, CharBuffer.class,
        ShortBuffer.class, IntBuffer.class, LongBuffer.class,
        FloatBuffer.class, DoubleBuffer.class,
        String[].class, Object[].class, int[].class);
  }

  public void testStringArray() {
    FreshValueGenerator generator = new FreshValueGenerator();
    String[] a1 = generator.generateFresh(String[].class);
    String[] a2 = generator.generateFresh(String[].class);
    assertFalse(a1[0].equals(a2[0]));
  }

  public void testPrimitiveArray() {
    FreshValueGenerator generator = new FreshValueGenerator();
    int[] a1 = generator.generateFresh(int[].class);
    int[] a2 = generator.generateFresh(int[].class);
    assertTrue(a1[0] != a2[0]);
  }

  public void testRange() {
    assertFreshInstance(new TypeToken<Range() {});
  }

  public void testImmutableList() {
    assertFreshInstance(new TypeToken<ImmutableList() {});
  }

  public void testImmutableSet() {
    assertFreshInstance(new TypeToken<ImmutableSet() {});
  }

  public void testImmutableSortedSet() {
    assertFreshInstance(new TypeToken<ImmutableSortedSet() {});
  }

  public void testImmutableMultiset() {
    assertFreshInstance(new TypeToken<ImmutableSortedSet() {});
    assertNotInstantiable(new TypeToken<ImmutableMultiset() {});
  }

  public void testImmutableCollection() {
    assertFreshInstance(new TypeToken<ImmutableCollection() {});
    assertNotInstantiable(new TypeToken<ImmutableCollection() {});
  }

  public void testImmutableMap() {
    assertFreshInstance(new TypeToken<ImmutableMap() {});
  }

  public void testImmutableSortedMap() {
    assertFreshInstance(new TypeToken<ImmutableSortedMap() {});
  }

  public void testImmutableMultimap() {
    assertFreshInstance(new TypeToken<ImmutableMultimap() {});
    assertNotInstantiable(new TypeToken<ImmutableMultimap() {});
  }

  public void testImmutableListMultimap() {
    assertFreshInstance(new TypeToken<ImmutableListMultimap() {});
  }

  public void testImmutableSetMultimap() {
    assertFreshInstance(new TypeToken<ImmutableSetMultimap() {});
  }

  public void testImmutableBiMap() {
    assertFreshInstance(new TypeToken<ImmutableBiMap() {});
  }

  public void testImmutableTable() {
    assertFreshInstance(new TypeToken<ImmutableTable>() {});
  }

  public void testList() {
    assertFreshInstance(new TypeToken<List() {});
    assertNotInstantiable(new TypeToken<List() {});
  }

  public void testArrayList() {
    assertFreshInstance(new TypeToken<ArrayList() {});
    assertNotInstantiable(new TypeToken<ArrayList() {});
  }

  public void testLinkedList() {
    assertFreshInstance(new TypeToken<LinkedList() {});
  }

  public void testSet() {
    assertFreshInstance(new TypeToken<Set() {});
    assertNotInstantiable(new TypeToken<Set() {});
  }

  public void testHashSet() {
    assertFreshInstance(new TypeToken<HashSet() {});
  }

  public void testLinkedHashSet() {
    assertFreshInstance(new TypeToken<LinkedHashSet() {});
  }

  public void testTreeSet() {
    assertFreshInstance(new TypeToken<TreeSet() {});
  }

  public void testSortedSet() {
    assertFreshInstance(new TypeToken<SortedSet() {});
  }

  public void testNavigableSet() {
    assertFreshInstance(new TypeToken<NavigableSet() {});
  }

  public void testMultiset() {
    assertFreshInstance(new TypeToken<Multiset() {});
  }

  public void testSortedMultiset() {
    assertFreshInstance(new TypeToken<SortedMultiset() {});
  }

  public void testHashMultiset() {
    assertFreshInstance(new TypeToken<HashMultiset() {});
  }

  public void testLinkedHashMultiset() {
    assertFreshInstance(new TypeToken<LinkedHashMultiset() {});
  }

  public void testTreeMultiset() {
    assertFreshInstance(new TypeToken<TreeMultiset() {});
  }

  public void testImmutableSortedMultiset() {
    assertFreshInstance(new TypeToken<ImmutableSortedMultiset() {});
  }

  public void testCollection() {
    assertFreshInstance(new TypeToken<Collection() {});
  }

  public void testIterable() {
    assertFreshInstance(new TypeToken<Iterable() {});
  }

  public void testMap() {
    assertFreshInstance(new TypeToken<Map() {});
  }

  public void testHashMap() {
    assertFreshInstance(new TypeToken<HashMap() {});
  }

  public void testLinkedHashMap() {
    assertFreshInstance(new TypeToken<LinkedHashMap() {});
  }

  public void testTreeMap() {
    assertFreshInstance(new TypeToken<TreeMap() {});
  }

  public void testSortedMap() {
    assertFreshInstance(new TypeToken<SortedMap() {});
  }

  public void testNavigableMap() {
    assertFreshInstance(new TypeToken<NavigableMap() {});
  }

  public void testConcurrentMap() {
    assertFreshInstance(new TypeToken<ConcurrentMap() {});
    assertCanGenerateOnly(new TypeToken<ConcurrentMap() {},
        Maps.newConcurrentMap());
  }

  public void testMultimap() {
    assertFreshInstance(new TypeToken<Multimap() {});
  }

  public void testHashMultimap() {
    assertFreshInstance(new TypeToken<HashMultimap() {});
  }

  public void testLinkedHashMultimap() {
    assertFreshInstance(new TypeToken<LinkedHashMultimap() {});
  }

  public void testListMultimap() {
    assertFreshInstance(new TypeToken<ListMultimap() {});
  }

  public void testArrayListMultimap() {
    assertFreshInstance(new TypeToken<ArrayListMultimap() {});
  }

  public void testSetMultimap() {
    assertFreshInstance(new TypeToken<SetMultimap() {});
  }

  public void testBiMap() {
    assertFreshInstance(new TypeToken<BiMap() {});
    assertNotInstantiable(new TypeToken<BiMap() {});
  }

  public void testHashBiMap() {
    assertFreshInstance(new TypeToken<HashBiMap() {});
  }

  public void testTable() {
    assertFreshInstance(new TypeToken<Table() {});
    assertNotInstantiable(new TypeToken<Table() {});
  }

  public void testHashBasedTable() {
    assertFreshInstance(new TypeToken<HashBasedTable() {});
  }

  public void testRowSortedTable() {
    assertFreshInstance(new TypeToken<RowSortedTable() {});
  }

  public void testTreeBasedTable() {
    assertFreshInstance(new TypeToken<TreeBasedTable() {});
  }

  public void testObject() {
    assertEquals(new FreshValueGenerator().generateFresh(String.class),
        new FreshValueGenerator().generateFresh(Object.class));
  }

  public void testEnums() {
    assertEqualInstance(EmptyEnum.class, null);
    assertEqualInstance(OneConstantEnum.class, OneConstantEnum.CONSTANT1);
    assertFreshInstance(TwoConstantEnum.class, 2);
    assertFreshInstance(new TypeToken<Optional() {}, 2);
    assertFreshInstance(new TypeToken<List() {}, 1);
    assertFreshInstance(new TypeToken<List() {}, 2);
  }

  @AndroidIncompatible // problem with equality of Type objects?
  public void testOptional() {
    FreshValueGenerator generator = new FreshValueGenerator();
    assertEquals(Optional.absent(), generator.generateFresh(new TypeToken<Optional() {}));
    assertEquals(Optional.of("2"), generator.generateFresh(new TypeToken<Optional() {}));
    // Test that the first generated instance for different Optional<T> is always absent().
    // Having generated Optional<String> instances doesn't prevent absent() from being generated for
    // other Optional types.
    assertEquals(Optional.absent(),
        generator.generateFresh(new TypeToken<Optional() {}));
    assertEquals(Optional.of(OneConstantEnum.CONSTANT1),
        generator.generateFresh(new TypeToken<Optional() {}));
  }

  public void testAddSampleInstances_twoInstances() {
    FreshValueGenerator generator = new FreshValueGenerator();
    generator.addSampleInstances(String.class, ImmutableList.of("a", "b"));
    assertEquals("a", generator.generateFresh(String.class));
    assertEquals("b", generator.generateFresh(String.class));
    assertEquals("a", generator.generateFresh(String.class));
  }

  public void testAddSampleInstances_oneInstance() {
    FreshValueGenerator generator = new FreshValueGenerator();
    generator.addSampleInstances(String.class, ImmutableList.of("a"));
    assertEquals("a", generator.generateFresh(String.class));
    assertEquals("a", generator.generateFresh(String.class));
  }

  public void testAddSampleInstances_noInstance() {
    FreshValueGenerator generator = new FreshValueGenerator();
    generator.addSampleInstances(String.class, ImmutableList.<String>of());
    assertEquals(new FreshValueGenerator().generateFresh(String.class),
        generator.generateFresh(String.class));
  }

  public void testFreshCurrency() {
    FreshValueGenerator generator = new FreshValueGenerator();
    // repeat a few times to make sure we don't stumble upon a bad Locale
    assertNotNull(generator.generateFresh(Currency.class));
    assertNotNull(generator.generateFresh(Currency.class));
    assertNotNull(generator.generateFresh(Currency.class));
  }

  public void testNulls() throws Exception {
    new ClassSanityTester()
        .setDefault(Method.class, FreshValueGeneratorTest.class.getDeclaredMethod("testNulls"))
        .testNulls(FreshValueGenerator.class);
  }

  private static void assertFreshInstances(Class<?>... types) {
    for (Class<?> type : types) {
      assertFreshInstance(type, 2);
    }
  }

  private static void assertFreshInstance(TypeToken<?> type) {
    assertFreshInstance(type, 3);
  }

  private static void assertFreshInstance(Class<?> type, int instances) {
    assertFreshInstance(TypeToken.of(type), instances);
  }

  private static void assertFreshInstance(TypeToken<?> type, int instances) {
    FreshValueGenerator generator = new FreshValueGenerator();
    EqualsTester tester = new EqualsTester();
    for (int i = 0; i < instances; i++) {
      tester.addEqualityGroup(generator.generateFresh(type));
    }
    tester.testEquals();
  }

  private static <T> void assertEqualInstance(Class type, T value) {
    FreshValueGenerator generator = new FreshValueGenerator();
    assertEquals(value, generator.generateFresh(type));
    assertEquals(value, generator.generateFresh(type));
  }

  private enum EmptyEnum {}

  private enum OneConstantEnum {
    CONSTANT1
  }

  private enum TwoConstantEnum {
    CONSTANT1, CONSTANT2
  }

  private static void assertCanGenerateOnly(TypeToken<?> type, Object expected) {
    FreshValueGenerator generator = new FreshValueGenerator();
    assertValueAndTypeEquals(expected, generator.generateFresh(type));
    assertNull(generator.generateFresh(type));
  }

  private static void assertNotInstantiable(TypeToken<?> type) {
    assertNull(new FreshValueGenerator().generateFresh(type));
  }

  private static void assertValueAndTypeEquals(Object expected, Object actual) {
    assertEquals(expected, actual);
    assertEquals(expected.getClass(), actual.getClass());
  }
}