guava-tests/test/com/google/common/collect/AbstractImmutableSetTest.java - platform/external/guava - Git at Google

 /*
  * 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.collect;

 import static com.google.common.collect.testing.IteratorFeature.UNMODIFIABLE;
 import static java.util.Arrays.asList;
 import static org.junit.contrib.truth.Truth.ASSERT;

 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.collect.testing.Helpers;
 import com.google.common.collect.testing.IteratorTester;
 import com.google.common.collect.testing.MinimalCollection;
 import com.google.common.collect.testing.MinimalIterable;

 import junit.framework.TestCase;

 import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;

 /**
  * Base class for {@link ImmutableSet} and  {@link ImmutableSortedSet} tests.
  *
  * @author Kevin Bourrillion
  * @author Jared Levy
  */
 @GwtCompatible(emulated = true)
 public abstract class AbstractImmutableSetTest extends TestCase {

   protected abstract Set<String> of();
   protected abstract Set<String> of(String e);
   protected abstract Set<String> of(String e1, String e2);
   protected abstract Set<String> of(String e1, String e2, String e3);
   protected abstract Set<String> of(String e1, String e2, String e3, String e4);
   protected abstract Set<String> of(String e1, String e2, String e3, String e4,
       String e5);
   protected abstract Set<String> of(String e1, String e2, String e3, String e4,
       String e5, String e6, String... rest);
   protected abstract Set<String> copyOf(String[] elements);
   protected abstract Set<String> copyOf(Collection<String> elements);
   protected abstract Set<String> copyOf(Iterable<String> elements);
   protected abstract Set<String> copyOf(Iterator<String> elements);

   public void testCreation_noArgs() {
     Set<String> set = of();
     assertEquals(Collections.<String>emptySet(), set);
     assertSame(of(), set);
   }

   public void testCreation_oneElement() {
     Set<String> set = of("a");
     assertEquals(Collections.singleton("a"), set);
   }

   public void testCreation_twoElements() {
     Set<String> set = of("a", "b");
     assertEquals(Sets.newHashSet("a", "b"), set);
   }

   public void testCreation_threeElements() {
     Set<String> set = of("a", "b", "c");
     assertEquals(Sets.newHashSet("a", "b", "c"), set);
   }

   public void testCreation_fourElements() {
     Set<String> set = of("a", "b", "c", "d");
     assertEquals(Sets.newHashSet("a", "b", "c", "d"), set);
   }

   public void testCreation_fiveElements() {
     Set<String> set = of("a", "b", "c", "d", "e");
     assertEquals(Sets.newHashSet("a", "b", "c", "d", "e"), set);
   }

   public void testCreation_sixElements() {
     Set<String> set = of("a", "b", "c", "d", "e", "f");
     assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f"), set);
   }

   public void testCreation_sevenElements() {
     Set<String> set = of("a", "b", "c", "d", "e", "f", "g");
     assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f", "g"), set);
   }

   public void testCreation_eightElements() {
     Set<String> set = of("a", "b", "c", "d", "e", "f", "g", "h");
     assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f", "g", "h"), set);
   }

   public void testCopyOf_emptyArray() {
     String[] array = new String[0];
     Set<String> set = copyOf(array);
     assertEquals(Collections.<String>emptySet(), set);
     assertSame(of(), set);
   }

   public void testCopyOf_arrayOfOneElement() {
     String[] array = new String[] { "a" };
     Set<String> set = copyOf(array);
     assertEquals(Collections.singleton("a"), set);
   }

   public void testCopyOf_nullArray() {
     try {
       copyOf((String[]) null);
       fail();
     } catch(NullPointerException expected) {
     }
   }

   public void testCopyOf_arrayContainingOnlyNull() {
     String[] array = new String[] { null };
     try {
       copyOf(array);
       fail();
     } catch (NullPointerException expected) {
     }
   }

   public void testCopyOf_collection_empty() {
     // "<String>" is required to work around a javac 1.5 bug.
     Collection<String> c = MinimalCollection.<String>of();
     Set<String> set = copyOf(c);
     assertEquals(Collections.<String>emptySet(), set);
     assertSame(of(), set);
   }

   public void testCopyOf_collection_oneElement() {
     Collection<String> c = MinimalCollection.of("a");
     Set<String> set = copyOf(c);
     assertEquals(Collections.singleton("a"), set);
   }

   public void testCopyOf_collection_oneElementRepeated() {
     Collection<String> c = MinimalCollection.of("a", "a", "a");
     Set<String> set = copyOf(c);
     assertEquals(Collections.singleton("a"), set);
   }

   public void testCopyOf_collection_general() {
     Collection<String> c = MinimalCollection.of("a", "b", "a");
     Set<String> set = copyOf(c);
     assertEquals(2, set.size());
     assertTrue(set.contains("a"));
     assertTrue(set.contains("b"));
   }

   public void testCopyOf_collectionContainingNull() {
     Collection<String> c = MinimalCollection.of("a", null, "b");
     try {
       copyOf(c);
       fail();
     } catch (NullPointerException expected) {
     }
   }

   public void testCopyOf_iterator_empty() {
     Iterator<String> iterator = Iterators.emptyIterator();
     Set<String> set = copyOf(iterator);
     assertEquals(Collections.<String>emptySet(), set);
     assertSame(of(), set);
   }

   public void testCopyOf_iterator_oneElement() {
     Iterator<String> iterator = Iterators.singletonIterator("a");
     Set<String> set = copyOf(iterator);
     assertEquals(Collections.singleton("a"), set);
   }

   public void testCopyOf_iterator_oneElementRepeated() {
     Iterator<String> iterator = Iterators.forArray("a", "a", "a");
     Set<String> set = copyOf(iterator);
     assertEquals(Collections.singleton("a"), set);
   }

   public void testCopyOf_iterator_general() {
     Iterator<String> iterator = Iterators.forArray("a", "b", "a");
     Set<String> set = copyOf(iterator);
     assertEquals(2, set.size());
     assertTrue(set.contains("a"));
     assertTrue(set.contains("b"));
   }

   public void testCopyOf_iteratorContainingNull() {
     Iterator<String> c = Iterators.forArray("a", null, "b");
     try {
       copyOf(c);
       fail();
     } catch (NullPointerException expected) {
     }
   }

   private static class CountingIterable implements Iterable<String> {
     int count = 0;
     @Override
     public Iterator<String> iterator() {
       count++;
       return Iterators.forArray("a", "b", "a");
     }
   }

   public void testCopyOf_plainIterable() {
     CountingIterable iterable = new CountingIterable();
     Set<String> set = copyOf(iterable);
     assertEquals(2, set.size());
     assertTrue(set.contains("a"));
     assertTrue(set.contains("b"));
   }

   public void testCopyOf_plainIterable_iteratesOnce() {
     CountingIterable iterable = new CountingIterable();
     copyOf(iterable);
     assertEquals(1, iterable.count);
   }

   public void testCopyOf_shortcut_empty() {
     Collection<String> c = of();
     assertEquals(Collections.<String>emptySet(), copyOf(c));
     assertSame(c, copyOf(c));
   }

   public void testCopyOf_shortcut_singleton() {
     Collection<String> c = of("a");
     assertEquals(Collections.singleton("a"), copyOf(c));
     assertSame(c, copyOf(c));
   }

   public void testCopyOf_shortcut_sameType() {
     Collection<String> c = of("a", "b", "c");
     assertSame(c, copyOf(c));
   }

   public void testToString() {
     Set<String> set = of("a", "b", "c", "d", "e", "f", "g");
     assertEquals("[a, b, c, d, e, f, g]", set.toString());
   }

   @GwtIncompatible("slow (~40s)")
   public void testIterator_oneElement() {
     new IteratorTester<String>(5, UNMODIFIABLE, Collections.singleton("a"),
         IteratorTester.KnownOrder.KNOWN_ORDER) {
       @Override protected Iterator<String> newTargetIterator() {
         return of("a").iterator();
       }
     }.test();
   }

   @GwtIncompatible("slow (~30s)")
   public void testIterator_general() {
     new IteratorTester<String>(5, UNMODIFIABLE, asList("a", "b", "c"),
         IteratorTester.KnownOrder.KNOWN_ORDER) {
       @Override protected Iterator<String> newTargetIterator() {
         return of("a", "b", "c").iterator();
       }
     }.test();
   }

   public void testContainsAll_sameType() {
     Collection<String> c = of("a", "b", "c");
     assertFalse(c.containsAll(of("a", "b", "c", "d")));
     assertFalse(c.containsAll(of("a", "d")));
     assertTrue(c.containsAll(of("a", "c")));
     assertTrue(c.containsAll(of("a", "b", "c")));
   }

   public void testEquals_sameType() {
     Collection<String> c = of("a", "b", "c");
     assertTrue(c.equals(of("a", "b", "c")));
     assertFalse(c.equals(of("a", "b", "d")));
   }

   abstract <E extends Comparable<E>> ImmutableSet.Builder<E> builder();

   public void testBuilderWithNonDuplicateElements() {
     ImmutableSet<String> set = this.<String>builder()
         .add("a")
         .add("b", "c")
         .add("d", "e", "f")
         .add("g", "h", "i", "j")
         .build();
     ASSERT.that(set).hasContentsInOrder(
         "a", "b", "c", "d", "e", "f", "g", "h", "i", "j");
   }

   public void testBuilderWithDuplicateElements() {
     ImmutableSet<String> set = this.<String>builder()
         .add("a")
         .add("a", "a")
         .add("a", "a", "a")
         .add("a", "a", "a", "a")
         .build();
     assertTrue(set.contains("a"));
     assertFalse(set.contains("b"));
     assertEquals(1, set.size());
   }

   public void testBuilderAddAll() {
     List<String> a = asList("a", "b", "c");
     List<String> b = asList("c", "d", "e");
     ImmutableSet<String> set = this.<String>builder()
         .addAll(a)
         .addAll(b)
         .build();
     ASSERT.that(set).hasContentsInOrder("a", "b", "c", "d", "e");
   }

   static final int LAST_COLOR_ADDED = 0x00BFFF;

   public void testComplexBuilder() {
     List<Integer> colorElem = asList(0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF);
     // javac won't compile this without "this.<Integer>"
     ImmutableSet.Builder<Integer> webSafeColorsBuilder
         = this.<Integer>builder();
     for (Integer red : colorElem) {
       for (Integer green : colorElem) {
         for (Integer blue : colorElem) {
           webSafeColorsBuilder.add((red << 16) + (green << 8) + blue);
         }
       }
     }
     ImmutableSet<Integer> webSafeColors = webSafeColorsBuilder.build();
     assertEquals(216, webSafeColors.size());
     Integer[] webSafeColorArray =
         webSafeColors.toArray(new Integer[webSafeColors.size()]);
     assertEquals(0x000000, (int) webSafeColorArray[0]);
     assertEquals(0x000033, (int) webSafeColorArray[1]);
     assertEquals(0x000066, (int) webSafeColorArray[2]);
     assertEquals(0x003300, (int) webSafeColorArray[6]);
     assertEquals(0x330000, (int) webSafeColorArray[36]);
     ImmutableSet<Integer> addedColor
         = webSafeColorsBuilder.add(LAST_COLOR_ADDED).build();
     assertEquals(
         "Modifying the builder should not have changed any already built sets",
         216, webSafeColors.size());
     assertEquals("the new array should be one bigger than webSafeColors",
         217, addedColor.size());
     Integer[] appendColorArray =
         addedColor.toArray(new Integer[addedColor.size()]);
     assertEquals(
         getComplexBuilderSetLastElement(), (int) appendColorArray[216]);
   }

   abstract int getComplexBuilderSetLastElement();

   public void testBuilderAddHandlesNullsCorrectly() {
     ImmutableSet.Builder<String> builder = this.<String>builder();
     try {
       builder.add((String) null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     builder = this.<String>builder();
     try {
       builder.add((String[]) null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     builder = this.<String>builder();
     try {
       builder.add("a", (String) null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     builder = this.<String>builder();
     try {
       builder.add("a", "b", (String) null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     builder = this.<String>builder();
     try {
       builder.add("a", "b", "c", null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     builder = this.<String>builder();
     try {
       builder.add("a", "b", null, "c");
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }
   }

   public void testBuilderAddAllHandlesNullsCorrectly() {
     ImmutableSet.Builder<String> builder = this.<String>builder();
     try {
       builder.addAll((Iterable<String>) null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     try {
       builder.addAll((Iterator<String>) null);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     builder = this.<String>builder();
     List<String> listWithNulls = asList("a", null, "b");
     try {
       builder.addAll(listWithNulls);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }

     Iterable<String> iterableWithNulls = MinimalIterable.of("a", null, "b");
     try {
       builder.addAll(iterableWithNulls);
       fail("expected NullPointerException");  // COV_NF_LINE
     } catch (NullPointerException expected) {
     }
   }

   /**
    * Verify thread safety by using a collection whose size() may be inconsistent
    * with the actual number of elements.  Tests using this method might fail in
    * GWT because the GWT emulations might count on size() during copy.  It is
    * safe to do so in GWT because javascript is single-threaded.
    */
   // TODO(benyu): turn this into a test once all copyOf(Collection) are
   // thread-safe
   @GwtIncompatible("GWT is single threaded")
   void verifyThreadSafe() {
     List<String> sample = Lists.newArrayList("a", "b", "c");
     for (int delta : new int[] {-1, 0, 1}) {
       for (int i = 0; i < sample.size(); i++) {
         Collection<String> misleading = Helpers.misleadingSizeCollection(delta);
         List<String> expected = sample.subList(0, i);
         misleading.addAll(expected);
         assertEquals("delta: " + delta + " sample size: " + i,
             Sets.newHashSet(expected), copyOf(misleading));
       }
     }
   }
 }
	/*
	* 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.collect;

	import static com.google.common.collect.testing.IteratorFeature.UNMODIFIABLE;
	import static java.util.Arrays.asList;
	import static org.junit.contrib.truth.Truth.ASSERT;

	import com.google.common.annotations.GwtCompatible;
	import com.google.common.annotations.GwtIncompatible;
	import com.google.common.collect.testing.Helpers;
	import com.google.common.collect.testing.IteratorTester;
	import com.google.common.collect.testing.MinimalCollection;
	import com.google.common.collect.testing.MinimalIterable;

	import junit.framework.TestCase;

	import java.util.Collection;
	import java.util.Collections;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Set;

	/**
	* Base class for {@link ImmutableSet} and {@link ImmutableSortedSet} tests.
	*
	* @author Kevin Bourrillion
	* @author Jared Levy
	*/
	@GwtCompatible(emulated = true)
	public abstract class AbstractImmutableSetTest extends TestCase {

	protected abstract Set<String> of();
	protected abstract Set<String> of(String e);
	protected abstract Set<String> of(String e1, String e2);
	protected abstract Set<String> of(String e1, String e2, String e3);
	protected abstract Set<String> of(String e1, String e2, String e3, String e4);
	protected abstract Set<String> of(String e1, String e2, String e3, String e4,
	String e5);
	protected abstract Set<String> of(String e1, String e2, String e3, String e4,
	String e5, String e6, String... rest);
	protected abstract Set<String> copyOf(String[] elements);
	protected abstract Set<String> copyOf(Collection<String> elements);
	protected abstract Set<String> copyOf(Iterable<String> elements);
	protected abstract Set<String> copyOf(Iterator<String> elements);

	public void testCreation_noArgs() {
	Set<String> set = of();
	assertEquals(Collections.<String>emptySet(), set);
	assertSame(of(), set);
	}

	public void testCreation_oneElement() {
	Set<String> set = of("a");
	assertEquals(Collections.singleton("a"), set);
	}

	public void testCreation_twoElements() {
	Set<String> set = of("a", "b");
	assertEquals(Sets.newHashSet("a", "b"), set);
	}

	public void testCreation_threeElements() {
	Set<String> set = of("a", "b", "c");
	assertEquals(Sets.newHashSet("a", "b", "c"), set);
	}

	public void testCreation_fourElements() {
	Set<String> set = of("a", "b", "c", "d");
	assertEquals(Sets.newHashSet("a", "b", "c", "d"), set);
	}

	public void testCreation_fiveElements() {
	Set<String> set = of("a", "b", "c", "d", "e");
	assertEquals(Sets.newHashSet("a", "b", "c", "d", "e"), set);
	}

	public void testCreation_sixElements() {
	Set<String> set = of("a", "b", "c", "d", "e", "f");
	assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f"), set);
	}

	public void testCreation_sevenElements() {
	Set<String> set = of("a", "b", "c", "d", "e", "f", "g");
	assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f", "g"), set);
	}

	public void testCreation_eightElements() {
	Set<String> set = of("a", "b", "c", "d", "e", "f", "g", "h");
	assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f", "g", "h"), set);
	}

	public void testCopyOf_emptyArray() {
	String[] array = new String[0];
	Set<String> set = copyOf(array);
	assertEquals(Collections.<String>emptySet(), set);
	assertSame(of(), set);
	}

	public void testCopyOf_arrayOfOneElement() {
	String[] array = new String[] { "a" };
	Set<String> set = copyOf(array);
	assertEquals(Collections.singleton("a"), set);
	}

	public void testCopyOf_nullArray() {
	try {
	copyOf((String[]) null);
	fail();
	} catch(NullPointerException expected) {
	}
	}

	public void testCopyOf_arrayContainingOnlyNull() {
	String[] array = new String[] { null };
	try {
	copyOf(array);
	fail();
	} catch (NullPointerException expected) {
	}
	}

	public void testCopyOf_collection_empty() {
	// "<String>" is required to work around a javac 1.5 bug.
	Collection<String> c = MinimalCollection.<String>of();
	Set<String> set = copyOf(c);
	assertEquals(Collections.<String>emptySet(), set);
	assertSame(of(), set);
	}

	public void testCopyOf_collection_oneElement() {
	Collection<String> c = MinimalCollection.of("a");
	Set<String> set = copyOf(c);
	assertEquals(Collections.singleton("a"), set);
	}

	public void testCopyOf_collection_oneElementRepeated() {
	Collection<String> c = MinimalCollection.of("a", "a", "a");
	Set<String> set = copyOf(c);
	assertEquals(Collections.singleton("a"), set);
	}

	public void testCopyOf_collection_general() {
	Collection<String> c = MinimalCollection.of("a", "b", "a");
	Set<String> set = copyOf(c);
	assertEquals(2, set.size());
	assertTrue(set.contains("a"));
	assertTrue(set.contains("b"));
	}

	public void testCopyOf_collectionContainingNull() {
	Collection<String> c = MinimalCollection.of("a", null, "b");
	try {
	copyOf(c);
	fail();
	} catch (NullPointerException expected) {
	}
	}

	public void testCopyOf_iterator_empty() {
	Iterator<String> iterator = Iterators.emptyIterator();
	Set<String> set = copyOf(iterator);
	assertEquals(Collections.<String>emptySet(), set);
	assertSame(of(), set);
	}

	public void testCopyOf_iterator_oneElement() {
	Iterator<String> iterator = Iterators.singletonIterator("a");
	Set<String> set = copyOf(iterator);
	assertEquals(Collections.singleton("a"), set);
	}

	public void testCopyOf_iterator_oneElementRepeated() {
	Iterator<String> iterator = Iterators.forArray("a", "a", "a");
	Set<String> set = copyOf(iterator);
	assertEquals(Collections.singleton("a"), set);
	}

	public void testCopyOf_iterator_general() {
	Iterator<String> iterator = Iterators.forArray("a", "b", "a");
	Set<String> set = copyOf(iterator);
	assertEquals(2, set.size());
	assertTrue(set.contains("a"));
	assertTrue(set.contains("b"));
	}

	public void testCopyOf_iteratorContainingNull() {
	Iterator<String> c = Iterators.forArray("a", null, "b");
	try {
	copyOf(c);
	fail();
	} catch (NullPointerException expected) {
	}
	}

	private static class CountingIterable implements Iterable<String> {
	int count = 0;
	@Override
	public Iterator<String> iterator() {
	count++;
	return Iterators.forArray("a", "b", "a");
	}
	}

	public void testCopyOf_plainIterable() {
	CountingIterable iterable = new CountingIterable();
	Set<String> set = copyOf(iterable);
	assertEquals(2, set.size());
	assertTrue(set.contains("a"));
	assertTrue(set.contains("b"));
	}

	public void testCopyOf_plainIterable_iteratesOnce() {
	CountingIterable iterable = new CountingIterable();
	copyOf(iterable);
	assertEquals(1, iterable.count);
	}

	public void testCopyOf_shortcut_empty() {
	Collection<String> c = of();
	assertEquals(Collections.<String>emptySet(), copyOf(c));
	assertSame(c, copyOf(c));
	}

	public void testCopyOf_shortcut_singleton() {
	Collection<String> c = of("a");
	assertEquals(Collections.singleton("a"), copyOf(c));
	assertSame(c, copyOf(c));
	}

	public void testCopyOf_shortcut_sameType() {
	Collection<String> c = of("a", "b", "c");
	assertSame(c, copyOf(c));
	}

	public void testToString() {
	Set<String> set = of("a", "b", "c", "d", "e", "f", "g");
	assertEquals("[a, b, c, d, e, f, g]", set.toString());
	}

	@GwtIncompatible("slow (~40s)")
	public void testIterator_oneElement() {
	new IteratorTester<String>(5, UNMODIFIABLE, Collections.singleton("a"),
	IteratorTester.KnownOrder.KNOWN_ORDER) {
	@Override protected Iterator<String> newTargetIterator() {
	return of("a").iterator();
	}
	}.test();
	}

	@GwtIncompatible("slow (~30s)")
	public void testIterator_general() {
	new IteratorTester<String>(5, UNMODIFIABLE, asList("a", "b", "c"),
	IteratorTester.KnownOrder.KNOWN_ORDER) {
	@Override protected Iterator<String> newTargetIterator() {
	return of("a", "b", "c").iterator();
	}
	}.test();
	}

	public void testContainsAll_sameType() {
	Collection<String> c = of("a", "b", "c");
	assertFalse(c.containsAll(of("a", "b", "c", "d")));
	assertFalse(c.containsAll(of("a", "d")));
	assertTrue(c.containsAll(of("a", "c")));
	assertTrue(c.containsAll(of("a", "b", "c")));
	}

	public void testEquals_sameType() {
	Collection<String> c = of("a", "b", "c");
	assertTrue(c.equals(of("a", "b", "c")));
	assertFalse(c.equals(of("a", "b", "d")));
	}

	abstract <E extends Comparable<E>> ImmutableSet.Builder<E> builder();

	public void testBuilderWithNonDuplicateElements() {
	ImmutableSet<String> set = this.<String>builder()
	.add("a")
	.add("b", "c")
	.add("d", "e", "f")
	.add("g", "h", "i", "j")
	.build();
	ASSERT.that(set).hasContentsInOrder(
	"a", "b", "c", "d", "e", "f", "g", "h", "i", "j");
	}

	public void testBuilderWithDuplicateElements() {
	ImmutableSet<String> set = this.<String>builder()
	.add("a")
	.add("a", "a")
	.add("a", "a", "a")
	.add("a", "a", "a", "a")
	.build();
	assertTrue(set.contains("a"));
	assertFalse(set.contains("b"));
	assertEquals(1, set.size());
	}

	public void testBuilderAddAll() {
	List<String> a = asList("a", "b", "c");
	List<String> b = asList("c", "d", "e");
	ImmutableSet<String> set = this.<String>builder()
	.addAll(a)
	.addAll(b)
	.build();
	ASSERT.that(set).hasContentsInOrder("a", "b", "c", "d", "e");
	}

	static final int LAST_COLOR_ADDED = 0x00BFFF;

	public void testComplexBuilder() {
	List<Integer> colorElem = asList(0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF);
	// javac won't compile this without "this.<Integer>"
	ImmutableSet.Builder<Integer> webSafeColorsBuilder
	= this.<Integer>builder();
	for (Integer red : colorElem) {
	for (Integer green : colorElem) {
	for (Integer blue : colorElem) {
	webSafeColorsBuilder.add((red << 16) + (green << 8) + blue);
	}
	}
	}
	ImmutableSet<Integer> webSafeColors = webSafeColorsBuilder.build();
	assertEquals(216, webSafeColors.size());
	Integer[] webSafeColorArray =
	webSafeColors.toArray(new Integer[webSafeColors.size()]);
	assertEquals(0x000000, (int) webSafeColorArray[0]);
	assertEquals(0x000033, (int) webSafeColorArray[1]);
	assertEquals(0x000066, (int) webSafeColorArray[2]);
	assertEquals(0x003300, (int) webSafeColorArray[6]);
	assertEquals(0x330000, (int) webSafeColorArray[36]);
	ImmutableSet<Integer> addedColor
	= webSafeColorsBuilder.add(LAST_COLOR_ADDED).build();
	assertEquals(
	"Modifying the builder should not have changed any already built sets",
	216, webSafeColors.size());
	assertEquals("the new array should be one bigger than webSafeColors",
	217, addedColor.size());
	Integer[] appendColorArray =
	addedColor.toArray(new Integer[addedColor.size()]);
	assertEquals(
	getComplexBuilderSetLastElement(), (int) appendColorArray[216]);
	}

	abstract int getComplexBuilderSetLastElement();

	public void testBuilderAddHandlesNullsCorrectly() {
	ImmutableSet.Builder<String> builder = this.<String>builder();
	try {
	builder.add((String) null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	builder = this.<String>builder();
	try {
	builder.add((String[]) null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	builder = this.<String>builder();
	try {
	builder.add("a", (String) null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	builder = this.<String>builder();
	try {
	builder.add("a", "b", (String) null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	builder = this.<String>builder();
	try {
	builder.add("a", "b", "c", null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	builder = this.<String>builder();
	try {
	builder.add("a", "b", null, "c");
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}
	}

	public void testBuilderAddAllHandlesNullsCorrectly() {
	ImmutableSet.Builder<String> builder = this.<String>builder();
	try {
	builder.addAll((Iterable<String>) null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	try {
	builder.addAll((Iterator<String>) null);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	builder = this.<String>builder();
	List<String> listWithNulls = asList("a", null, "b");
	try {
	builder.addAll(listWithNulls);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}

	Iterable<String> iterableWithNulls = MinimalIterable.of("a", null, "b");
	try {
	builder.addAll(iterableWithNulls);
	fail("expected NullPointerException"); // COV_NF_LINE
	} catch (NullPointerException expected) {
	}
	}

	/**
	* Verify thread safety by using a collection whose size() may be inconsistent
	* with the actual number of elements. Tests using this method might fail in
	* GWT because the GWT emulations might count on size() during copy. It is
	* safe to do so in GWT because javascript is single-threaded.
	*/
	// TODO(benyu): turn this into a test once all copyOf(Collection) are
	// thread-safe
	@GwtIncompatible("GWT is single threaded")
	void verifyThreadSafe() {
	List<String> sample = Lists.newArrayList("a", "b", "c");
	for (int delta : new int[] {-1, 0, 1}) {
	for (int i = 0; i < sample.size(); i++) {
	Collection<String> misleading = Helpers.misleadingSizeCollection(delta);
	List<String> expected = sample.subList(0, i);
	misleading.addAll(expected);
	assertEquals("delta: " + delta + " sample size: " + i,
	Sets.newHashSet(expected), copyOf(misleading));
	}
	}
	}
	}