android/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 com.google.common.truth.Truth.assertThat;
 import static java.util.Arrays.asList;

 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 java.util.Collection;
 import java.util.Collections;
 import java.util.EnumSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 import junit.framework.TestCase;

 /**
  * 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 <E extends Comparable<? super E>> Set<E> of();

   protected abstract <E extends Comparable<? super E>> Set<E> of(E e);

   protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2);

   protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2, E e3);

   protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2, E e3, E e4);

   protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2, E e3, E e4, E e5);

   @SuppressWarnings("unchecked")
   protected abstract <E extends Comparable<? super E>> Set<E> of(
       E e1, E e2, E e3, E e4, E e5, E e6, E... rest);

   protected abstract <E extends Comparable<? super E>> Set<E> copyOf(E[] elements);

   protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
       Collection<? extends E> elements);

   protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
       Iterable<? extends E> elements);

   protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
       Iterator<? extends E> 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) {
     }
   }

   enum TestEnum {
     A,
     B,
     C,
     D
   }

   public void testCopyOf_collection_enumSet() {
     Collection<TestEnum> c = EnumSet.of(TestEnum.A, TestEnum.B, TestEnum.D);
     Set<TestEnum> set = copyOf(c);
     assertEquals(3, set.size());
     assertEquals(c, set);
   }

   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();
     Set<String> unused = 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();
     assertThat(set).containsExactly("a", "b", "c", "d", "e", "f", "g", "h", "i", "j").inOrder();
   }

   public void testReuseBuilderWithNonDuplicateElements() {
     ImmutableSet.Builder<String> builder = this.<String>builder().add("a").add("b");
     assertThat(builder.build()).containsExactly("a", "b").inOrder();
     builder.add("c", "d");
     assertThat(builder.build()).containsExactly("a", "b", "c", "d").inOrder();
   }

   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 testReuseBuilderWithDuplicateElements() {
     ImmutableSet.Builder<String> builder = this.<String>builder().add("a").add("a", "a").add("b");
     assertThat(builder.build()).containsExactly("a", "b").inOrder();
     builder.add("a", "b", "c", "c");
     assertThat(builder.build()).containsExactly("a", "b", "c").inOrder();
   }

   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();
     assertThat(set).containsExactly("a", "b", "c", "d", "e").inOrder();
   }

   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 com.google.common.truth.Truth.assertThat;
	import static java.util.Arrays.asList;

	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 java.util.Collection;
	import java.util.Collections;
	import java.util.EnumSet;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Set;
	import junit.framework.TestCase;

	/**
	* 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 <E extends Comparable<? super E>> Set<E> of();

	protected abstract <E extends Comparable<? super E>> Set<E> of(E e);

	protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2);

	protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2, E e3);

	protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2, E e3, E e4);

	protected abstract <E extends Comparable<? super E>> Set<E> of(E e1, E e2, E e3, E e4, E e5);

	@SuppressWarnings("unchecked")
	protected abstract <E extends Comparable<? super E>> Set<E> of(
	E e1, E e2, E e3, E e4, E e5, E e6, E... rest);

	protected abstract <E extends Comparable<? super E>> Set<E> copyOf(E[] elements);

	protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
	Collection<? extends E> elements);

	protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
	Iterable<? extends E> elements);

	protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
	Iterator<? extends E> 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) {
	}
	}

	enum TestEnum {
	A,
	B,
	C,
	D
	}

	public void testCopyOf_collection_enumSet() {
	Collection<TestEnum> c = EnumSet.of(TestEnum.A, TestEnum.B, TestEnum.D);
	Set<TestEnum> set = copyOf(c);
	assertEquals(3, set.size());
	assertEquals(c, set);
	}

	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();
	Set<String> unused = 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();
	assertThat(set).containsExactly("a", "b", "c", "d", "e", "f", "g", "h", "i", "j").inOrder();
	}

	public void testReuseBuilderWithNonDuplicateElements() {
	ImmutableSet.Builder<String> builder = this.<String>builder().add("a").add("b");
	assertThat(builder.build()).containsExactly("a", "b").inOrder();
	builder.add("c", "d");
	assertThat(builder.build()).containsExactly("a", "b", "c", "d").inOrder();
	}

	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 testReuseBuilderWithDuplicateElements() {
	ImmutableSet.Builder<String> builder = this.<String>builder().add("a").add("a", "a").add("b");
	assertThat(builder.build()).containsExactly("a", "b").inOrder();
	builder.add("a", "b", "c", "c");
	assertThat(builder.build()).containsExactly("a", "b", "c").inOrder();
	}

	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();
	assertThat(set).containsExactly("a", "b", "c", "d", "e").inOrder();
	}

	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));
	}
	}
	}
	}