Examples of com.google.common.testutils.EqualsTester

com.google.common.testutils.EqualsTester
Tester for equals() and hashCode() methods of a class.
To use, create a new EqualsTester and add equality groups where each group contains objects that are supposed to be equal to each other, and objects of different groups are expected to be unequal. For example:
```
 new EqualsTester() .addEqualityGroup("hello", "h" + "ello") .addEqualityGroup("world", "wor" + "ld") .addEqualityGroup(2, 1 + 1) .testEquals(); 
```
This tests:
- comparing each object against itself returns true
- comparing each object against null returns false
- comparing each object an instance of an incompatible class returns false
- comparing each pair of objects within the same equality group returns true
- comparing each pair of objects from different equality groups returns false
- the hash code of any two equal objects are equal
For backward compatibility, the following usage pattern is also supported:
1. Create a reference instance of the class under test and use to create a new EqualsTester.
2. Create one or more new instances of the class that should be equal to the reference instance and pass to addEqualObject(). Multiple instances can be used to test subclasses.
3. Create one or more new instances that should not be equal to the reference instance and pass to addNotEqualObject. For complete testing, you should add one instance that varies in each aspect checked by equals().
4. Invoke {@link #testEquals} on the EqualsTester.
@author Jim McMaster @author Jige Yu

    assertTrue(isComparable.apply(""));
    assertFalse(isComparable.apply(null));
  }


  public void testIsInstanceOf_equality() {
    new EqualsTester(Predicates.instanceOf(Integer.class))
        .addEqualObject(Predicates.instanceOf(Integer.class))
        .addNotEqualObject(Predicates.instanceOf(Number.class))
        .addNotEqualObject(Predicates.instanceOf(Float.class))
        .testEquals();
  }

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    assertTrue(isNull.apply(null));
    assertFalse(isNull.apply(1));
  }


  public void testIsNull_equality() {
    new EqualsTester(Predicates.isNull())
        .addEqualObject(Predicates.isNull())
        .addNotEqualObject(Predicates.notNull())
        .testEquals();
  }

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    assertFalse(notNull.apply(null));
    assertTrue(notNull.apply(1));
  }


  public void testNotNull_equality() {
    new EqualsTester(Predicates.notNull())
        .addEqualObject(Predicates.notNull())
        .addNotEqualObject(Predicates.isNull())
        .testEquals();
  }

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    Collection<Integer> nums = ImmutableSet.of(1, 5);
    Collection<Integer> sameOrder = ImmutableSet.of(1, 5);
    Collection<Integer> differentOrder = ImmutableSet.of(5, 1);
    Collection<Integer> differentNums = ImmutableSet.of(1, 3, 5);


    new EqualsTester(Predicates.in(nums))
        .addEqualObject(Predicates.in(nums))
        .addEqualObject(Predicates.in(sameOrder))
        .addEqualObject(Predicates.in(differentOrder))
        .addNotEqualObject(Predicates.in(differentNums))
        .testEquals();

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    assertTrue(trimEqualsFoo.apply("Foo"));
    assertTrue(trimEqualsFoo.apply("   Foo   "));
    assertFalse(trimEqualsFoo.apply("Foo-b-que"));


    new EqualsTester(trimEqualsFoo)
        .addEqualObject(Predicates.compose(equalsFoo, trim))
        .addNotEqualObject(equalsFoo)
        .addNotEqualObject(trim)
        .addNotEqualObject(Predicates.compose(equalsFoo, identity))
        .addNotEqualObject(Predicates.compose(equalsBar, trim))

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