android/guava-tests/test/com/google/common/primitives/CharsTest.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.primitives;

 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.collect.testing.Helpers;
 import com.google.common.testing.NullPointerTester;
 import com.google.common.testing.SerializableTester;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Locale;
 import junit.framework.TestCase;

 /**
  * Unit test for {@link Chars}.
  *
  * @author Kevin Bourrillion
  */
 @GwtCompatible(emulated = true)
 @SuppressWarnings("cast") // redundant casts are intentional and harmless
 public class CharsTest extends TestCase {
   private static final char[] EMPTY = {};
   private static final char[] ARRAY1 = {(char) 1};
   private static final char[] ARRAY234 = {(char) 2, (char) 3, (char) 4};

   private static final char LEAST = Character.MIN_VALUE;
   private static final char GREATEST = Character.MAX_VALUE;

   private static final char[] VALUES = {LEAST, 'a', '\u00e0', '\udcaa', GREATEST};

   public void testHashCode() {
     for (char value : VALUES) {
       assertEquals(((Character) value).hashCode(), Chars.hashCode(value));
     }
   }

   public void testCheckedCast() {
     for (char value : VALUES) {
       assertEquals(value, Chars.checkedCast((long) value));
     }
     assertCastFails(GREATEST + 1L);
     assertCastFails(LEAST - 1L);
     assertCastFails(Long.MAX_VALUE);
     assertCastFails(Long.MIN_VALUE);
   }

   public void testSaturatedCast() {
     for (char value : VALUES) {
       assertEquals(value, Chars.saturatedCast((long) value));
     }
     assertEquals(GREATEST, Chars.saturatedCast(GREATEST + 1L));
     assertEquals(LEAST, Chars.saturatedCast(LEAST - 1L));
     assertEquals(GREATEST, Chars.saturatedCast(Long.MAX_VALUE));
     assertEquals(LEAST, Chars.saturatedCast(Long.MIN_VALUE));
   }

   private void assertCastFails(long value) {
     try {
       Chars.checkedCast(value);
       fail("Cast to char should have failed: " + value);
     } catch (IllegalArgumentException ex) {
       assertTrue(
           value + " not found in exception text: " + ex.getMessage(),
           ex.getMessage().contains(String.valueOf(value)));
     }
   }

   public void testCompare() {
     for (char x : VALUES) {
       for (char y : VALUES) {
         // note: spec requires only that the sign is the same
         assertEquals(x + ", " + y, Character.valueOf(x).compareTo(y), Chars.compare(x, y));
       }
     }
   }

   public void testContains() {
     assertFalse(Chars.contains(EMPTY, (char) 1));
     assertFalse(Chars.contains(ARRAY1, (char) 2));
     assertFalse(Chars.contains(ARRAY234, (char) 1));
     assertTrue(Chars.contains(new char[] {(char) -1}, (char) -1));
     assertTrue(Chars.contains(ARRAY234, (char) 2));
     assertTrue(Chars.contains(ARRAY234, (char) 3));
     assertTrue(Chars.contains(ARRAY234, (char) 4));
   }

   public void testIndexOf() {
     assertEquals(-1, Chars.indexOf(EMPTY, (char) 1));
     assertEquals(-1, Chars.indexOf(ARRAY1, (char) 2));
     assertEquals(-1, Chars.indexOf(ARRAY234, (char) 1));
     assertEquals(0, Chars.indexOf(new char[] {(char) -1}, (char) -1));
     assertEquals(0, Chars.indexOf(ARRAY234, (char) 2));
     assertEquals(1, Chars.indexOf(ARRAY234, (char) 3));
     assertEquals(2, Chars.indexOf(ARRAY234, (char) 4));
     assertEquals(1, Chars.indexOf(new char[] {(char) 2, (char) 3, (char) 2, (char) 3}, (char) 3));
   }

   public void testIndexOf_arrayTarget() {
     assertEquals(0, Chars.indexOf(EMPTY, EMPTY));
     assertEquals(0, Chars.indexOf(ARRAY234, EMPTY));
     assertEquals(-1, Chars.indexOf(EMPTY, ARRAY234));
     assertEquals(-1, Chars.indexOf(ARRAY234, ARRAY1));
     assertEquals(-1, Chars.indexOf(ARRAY1, ARRAY234));
     assertEquals(0, Chars.indexOf(ARRAY1, ARRAY1));
     assertEquals(0, Chars.indexOf(ARRAY234, ARRAY234));
     assertEquals(0, Chars.indexOf(ARRAY234, new char[] {(char) 2, (char) 3}));
     assertEquals(1, Chars.indexOf(ARRAY234, new char[] {(char) 3, (char) 4}));
     assertEquals(1, Chars.indexOf(ARRAY234, new char[] {(char) 3}));
     assertEquals(2, Chars.indexOf(ARRAY234, new char[] {(char) 4}));
     assertEquals(
         1,
         Chars.indexOf(
             new char[] {(char) 2, (char) 3, (char) 3, (char) 3, (char) 3}, new char[] {(char) 3}));
     assertEquals(
         2,
         Chars.indexOf(
             new char[] {(char) 2, (char) 3, (char) 2, (char) 3, (char) 4, (char) 2, (char) 3},
             new char[] {(char) 2, (char) 3, (char) 4}));
     assertEquals(
         1,
         Chars.indexOf(
             new char[] {(char) 2, (char) 2, (char) 3, (char) 4, (char) 2, (char) 3, (char) 4},
             new char[] {(char) 2, (char) 3, (char) 4}));
     assertEquals(
         -1,
         Chars.indexOf(
             new char[] {(char) 4, (char) 3, (char) 2}, new char[] {(char) 2, (char) 3, (char) 4}));
   }

   public void testLastIndexOf() {
     assertEquals(-1, Chars.lastIndexOf(EMPTY, (char) 1));
     assertEquals(-1, Chars.lastIndexOf(ARRAY1, (char) 2));
     assertEquals(-1, Chars.lastIndexOf(ARRAY234, (char) 1));
     assertEquals(0, Chars.lastIndexOf(new char[] {(char) -1}, (char) -1));
     assertEquals(0, Chars.lastIndexOf(ARRAY234, (char) 2));
     assertEquals(1, Chars.lastIndexOf(ARRAY234, (char) 3));
     assertEquals(2, Chars.lastIndexOf(ARRAY234, (char) 4));
     assertEquals(
         3, Chars.lastIndexOf(new char[] {(char) 2, (char) 3, (char) 2, (char) 3}, (char) 3));
   }

   public void testMax_noArgs() {
     try {
       Chars.max();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testMax() {
     assertEquals(LEAST, Chars.max(LEAST));
     assertEquals(GREATEST, Chars.max(GREATEST));
     assertEquals(
         (char) 9, Chars.max((char) 8, (char) 6, (char) 7, (char) 5, (char) 3, (char) 0, (char) 9));
   }

   public void testMin_noArgs() {
     try {
       Chars.min();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testMin() {
     assertEquals(LEAST, Chars.min(LEAST));
     assertEquals(GREATEST, Chars.min(GREATEST));
     assertEquals(
         (char) 0, Chars.min((char) 8, (char) 6, (char) 7, (char) 5, (char) 3, (char) 0, (char) 9));
   }

   public void testConstrainToRange() {
     assertEquals((char) 1, Chars.constrainToRange((char) 1, (char) 0, (char) 5));
     assertEquals((char) 1, Chars.constrainToRange((char) 1, (char) 1, (char) 5));
     assertEquals((char) 3, Chars.constrainToRange((char) 1, (char) 3, (char) 5));
     assertEquals((char) 254, Chars.constrainToRange((char) 255, (char) 250, (char) 254));
     assertEquals((char) 2, Chars.constrainToRange((char) 5, (char) 2, (char) 2));
     try {
       Chars.constrainToRange((char) 1, (char) 3, (char) 2);
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testConcat() {
     assertTrue(Arrays.equals(EMPTY, Chars.concat()));
     assertTrue(Arrays.equals(EMPTY, Chars.concat(EMPTY)));
     assertTrue(Arrays.equals(EMPTY, Chars.concat(EMPTY, EMPTY, EMPTY)));
     assertTrue(Arrays.equals(ARRAY1, Chars.concat(ARRAY1)));
     assertNotSame(ARRAY1, Chars.concat(ARRAY1));
     assertTrue(Arrays.equals(ARRAY1, Chars.concat(EMPTY, ARRAY1, EMPTY)));
     assertTrue(
         Arrays.equals(
             new char[] {(char) 1, (char) 1, (char) 1}, Chars.concat(ARRAY1, ARRAY1, ARRAY1)));
     assertTrue(
         Arrays.equals(
             new char[] {(char) 1, (char) 2, (char) 3, (char) 4}, Chars.concat(ARRAY1, ARRAY234)));
   }

   @GwtIncompatible // Chars.fromByteArray
   public void testFromByteArray() {
     assertEquals('\u2345', Chars.fromByteArray(new byte[] {0x23, 0x45, (byte) 0xDC}));
     assertEquals('\uFEDC', Chars.fromByteArray(new byte[] {(byte) 0xFE, (byte) 0xDC}));
   }

   @GwtIncompatible // Chars.fromByteArray
   public void testFromByteArrayFails() {
     try {
       Chars.fromByteArray(new byte[Chars.BYTES - 1]);
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   @GwtIncompatible // Chars.fromBytes
   public void testFromBytes() {
     assertEquals('\u2345', Chars.fromBytes((byte) 0x23, (byte) 0x45));
     assertEquals('\uFEDC', Chars.fromBytes((byte) 0xFE, (byte) 0xDC));
   }

   @GwtIncompatible // Chars.fromByteArray, Chars.toByteArray
   public void testByteArrayRoundTrips() {
     char c = 0;
     for (int hi = 0; hi < 256; hi++) {
       for (int lo = 0; lo < 256; lo++) {
         char result = Chars.fromByteArray(new byte[] {(byte) hi, (byte) lo});
         assertEquals(
             String.format(
                 Locale.ROOT, "hi=%s, lo=%s, expected=%s, result=%s", hi, lo, (int) c, (int) result),
             c,
             result);

         byte[] bytes = Chars.toByteArray(c);
         assertEquals((byte) hi, bytes[0]);
         assertEquals((byte) lo, bytes[1]);

         c++;
       }
     }
     assertEquals((char) 0, c); // sanity check
   }

   @GwtIncompatible // Chars.fromByteArray, Chars.toByteArray
   public void testByteArrayRoundTripsFails() {
     try {
       Chars.fromByteArray(new byte[] {0x11});
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testEnsureCapacity() {
     assertSame(EMPTY, Chars.ensureCapacity(EMPTY, 0, 1));
     assertSame(ARRAY1, Chars.ensureCapacity(ARRAY1, 0, 1));
     assertSame(ARRAY1, Chars.ensureCapacity(ARRAY1, 1, 1));
     assertTrue(
         Arrays.equals(
             new char[] {(char) 1, (char) 0, (char) 0}, Chars.ensureCapacity(ARRAY1, 2, 1)));
   }

   public void testEnsureCapacity_fail() {
     try {
       Chars.ensureCapacity(ARRAY1, -1, 1);
       fail();
     } catch (IllegalArgumentException expected) {
     }
     try {
       // notice that this should even fail when no growth was needed
       Chars.ensureCapacity(ARRAY1, 1, -1);
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testJoin() {
     assertEquals("", Chars.join(",", EMPTY));
     assertEquals("1", Chars.join(",", '1'));
     assertEquals("1,2", Chars.join(",", '1', '2'));
     assertEquals("123", Chars.join("", '1', '2', '3'));
   }

   public void testLexicographicalComparator() {
     List<char[]> ordered =
         Arrays.asList(
             new char[] {},
             new char[] {LEAST},
             new char[] {LEAST, LEAST},
             new char[] {LEAST, (char) 1},
             new char[] {(char) 1},
             new char[] {(char) 1, LEAST},
             new char[] {GREATEST, GREATEST - (char) 1},
             new char[] {GREATEST, GREATEST},
             new char[] {GREATEST, GREATEST, GREATEST});

     Comparator<char[]> comparator = Chars.lexicographicalComparator();
     Helpers.testComparator(comparator, ordered);
   }

   @GwtIncompatible // SerializableTester
   public void testLexicographicalComparatorSerializable() {
     Comparator<char[]> comparator = Chars.lexicographicalComparator();
     assertSame(comparator, SerializableTester.reserialize(comparator));
   }

   public void testReverse() {
     testReverse(new char[] {}, new char[] {});
     testReverse(new char[] {'1'}, new char[] {'1'});
     testReverse(new char[] {'1', '2'}, new char[] {'2', '1'});
     testReverse(new char[] {'3', '1', '1'}, new char[] {'1', '1', '3'});
     testReverse(new char[] {'A', '1', 'B', '2'}, new char[] {'2', 'B', '1', 'A'});
   }

   private static void testReverse(char[] input, char[] expectedOutput) {
     input = Arrays.copyOf(input, input.length);
     Chars.reverse(input);
     assertTrue(Arrays.equals(expectedOutput, input));
   }

   private static void testReverse(char[] input, int fromIndex, int toIndex, char[] expectedOutput) {
     input = Arrays.copyOf(input, input.length);
     Chars.reverse(input, fromIndex, toIndex);
     assertTrue(Arrays.equals(expectedOutput, input));
   }

   public void testReverseIndexed() {
     testReverse(new char[] {}, 0, 0, new char[] {});
     testReverse(new char[] {'1'}, 0, 1, new char[] {'1'});
     testReverse(new char[] {'1', '2'}, 0, 2, new char[] {'2', '1'});
     testReverse(new char[] {'3', '1', '1'}, 0, 2, new char[] {'1', '3', '1'});
     testReverse(new char[] {'3', '1', '1'}, 0, 1, new char[] {'3', '1', '1'});
     testReverse(new char[] {'A', '1', 'B', '2'}, 1, 3, new char[] {'A', 'B', '1', '2'});
   }

   public void testSortDescending() {
     testSortDescending(new char[] {}, new char[] {});
     testSortDescending(new char[] {'1'}, new char[] {'1'});
     testSortDescending(new char[] {'1', '2'}, new char[] {'2', '1'});
     testSortDescending(new char[] {'1', '3', '1'}, new char[] {'3', '1', '1'});
     testSortDescending(new char[] {'A', '1', 'B', '2'}, new char[] {'B', 'A', '2', '1'});
   }

   private static void testSortDescending(char[] input, char[] expectedOutput) {
     input = Arrays.copyOf(input, input.length);
     Chars.sortDescending(input);
     assertTrue(Arrays.equals(expectedOutput, input));
   }

   private static void testSortDescending(
       char[] input, int fromIndex, int toIndex, char[] expectedOutput) {
     input = Arrays.copyOf(input, input.length);
     Chars.sortDescending(input, fromIndex, toIndex);
     assertTrue(Arrays.equals(expectedOutput, input));
   }

   public void testSortDescendingIndexed() {
     testSortDescending(new char[] {}, 0, 0, new char[] {});
     testSortDescending(new char[] {'1'}, 0, 1, new char[] {'1'});
     testSortDescending(new char[] {'1', '2'}, 0, 2, new char[] {'2', '1'});
     testSortDescending(new char[] {'1', '3', '1'}, 0, 2, new char[] {'3', '1', '1'});
     testSortDescending(new char[] {'1', '3', '1'}, 0, 1, new char[] {'1', '3', '1'});
     testSortDescending(new char[] {'A', '1', 'B', '2'}, 1, 3, new char[] {'A', 'B', '1', '2'});
   }

   public void testToArray() {
     // need explicit type parameter to avoid javac warning!?
     List<Character> none = Arrays.<Character>asList();
     assertTrue(Arrays.equals(EMPTY, Chars.toArray(none)));

     List<Character> one = Arrays.asList((char) 1);
     assertTrue(Arrays.equals(ARRAY1, Chars.toArray(one)));

     char[] array = {(char) 0, (char) 1, 'A'};

     List<Character> three = Arrays.asList((char) 0, (char) 1, 'A');
     assertTrue(Arrays.equals(array, Chars.toArray(three)));

     assertTrue(Arrays.equals(array, Chars.toArray(Chars.asList(array))));
   }

   public void testToArray_threadSafe() {
     for (int delta : new int[] {+1, 0, -1}) {
       for (int i = 0; i < VALUES.length; i++) {
         List<Character> list = Chars.asList(VALUES).subList(0, i);
         Collection<Character> misleadingSize = Helpers.misleadingSizeCollection(delta);
         misleadingSize.addAll(list);
         char[] arr = Chars.toArray(misleadingSize);
         assertEquals(i, arr.length);
         for (int j = 0; j < i; j++) {
           assertEquals(VALUES[j], arr[j]);
         }
       }
     }
   }

   public void testToArray_withNull() {
     List<Character> list = Arrays.asList((char) 0, (char) 1, null);
     try {
       Chars.toArray(list);
       fail();
     } catch (NullPointerException expected) {
     }
   }

   public void testAsList_isAView() {
     char[] array = {(char) 0, (char) 1};
     List<Character> list = Chars.asList(array);
     list.set(0, (char) 2);
     assertTrue(Arrays.equals(new char[] {(char) 2, (char) 1}, array));
     array[1] = (char) 3;
     assertEquals(Arrays.asList((char) 2, (char) 3), list);
   }

   public void testAsList_toArray_roundTrip() {
     char[] array = {(char) 0, (char) 1, (char) 2};
     List<Character> list = Chars.asList(array);
     char[] newArray = Chars.toArray(list);

     // Make sure it returned a copy
     list.set(0, (char) 4);
     assertTrue(Arrays.equals(new char[] {(char) 0, (char) 1, (char) 2}, newArray));
     newArray[1] = (char) 5;
     assertEquals((char) 1, (char) list.get(1));
   }

   // This test stems from a real bug found by andrewk
   public void testAsList_subList_toArray_roundTrip() {
     char[] array = {(char) 0, (char) 1, (char) 2, (char) 3};
     List<Character> list = Chars.asList(array);
     assertTrue(Arrays.equals(new char[] {(char) 1, (char) 2}, Chars.toArray(list.subList(1, 3))));
     assertTrue(Arrays.equals(new char[] {}, Chars.toArray(list.subList(2, 2))));
   }

   public void testAsListEmpty() {
     assertSame(Collections.emptyList(), Chars.asList(EMPTY));
   }

   @GwtIncompatible // NullPointerTester
   public void testNulls() {
     new NullPointerTester().testAllPublicStaticMethods(Chars.class);
   }
 }
	/*
	* 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.primitives;

	import com.google.common.annotations.GwtCompatible;
	import com.google.common.annotations.GwtIncompatible;
	import com.google.common.collect.testing.Helpers;
	import com.google.common.testing.NullPointerTester;
	import com.google.common.testing.SerializableTester;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.List;
	import java.util.Locale;
	import junit.framework.TestCase;

	/**
	* Unit test for {@link Chars}.
	*
	* @author Kevin Bourrillion
	*/
	@GwtCompatible(emulated = true)
	@SuppressWarnings("cast") // redundant casts are intentional and harmless
	public class CharsTest extends TestCase {
	private static final char[] EMPTY = {};
	private static final char[] ARRAY1 = {(char) 1};
	private static final char[] ARRAY234 = {(char) 2, (char) 3, (char) 4};

	private static final char LEAST = Character.MIN_VALUE;
	private static final char GREATEST = Character.MAX_VALUE;

	private static final char[] VALUES = {LEAST, 'a', '\u00e0', '\udcaa', GREATEST};

	public void testHashCode() {
	for (char value : VALUES) {
	assertEquals(((Character) value).hashCode(), Chars.hashCode(value));
	}
	}

	public void testCheckedCast() {
	for (char value : VALUES) {
	assertEquals(value, Chars.checkedCast((long) value));
	}
	assertCastFails(GREATEST + 1L);
	assertCastFails(LEAST - 1L);
	assertCastFails(Long.MAX_VALUE);
	assertCastFails(Long.MIN_VALUE);
	}

	public void testSaturatedCast() {
	for (char value : VALUES) {
	assertEquals(value, Chars.saturatedCast((long) value));
	}
	assertEquals(GREATEST, Chars.saturatedCast(GREATEST + 1L));
	assertEquals(LEAST, Chars.saturatedCast(LEAST - 1L));
	assertEquals(GREATEST, Chars.saturatedCast(Long.MAX_VALUE));
	assertEquals(LEAST, Chars.saturatedCast(Long.MIN_VALUE));
	}

	private void assertCastFails(long value) {
	try {
	Chars.checkedCast(value);
	fail("Cast to char should have failed: " + value);
	} catch (IllegalArgumentException ex) {
	assertTrue(
	value + " not found in exception text: " + ex.getMessage(),
	ex.getMessage().contains(String.valueOf(value)));
	}
	}

	public void testCompare() {
	for (char x : VALUES) {
	for (char y : VALUES) {
	// note: spec requires only that the sign is the same
	assertEquals(x + ", " + y, Character.valueOf(x).compareTo(y), Chars.compare(x, y));
	}
	}
	}

	public void testContains() {
	assertFalse(Chars.contains(EMPTY, (char) 1));
	assertFalse(Chars.contains(ARRAY1, (char) 2));
	assertFalse(Chars.contains(ARRAY234, (char) 1));
	assertTrue(Chars.contains(new char[] {(char) -1}, (char) -1));
	assertTrue(Chars.contains(ARRAY234, (char) 2));
	assertTrue(Chars.contains(ARRAY234, (char) 3));
	assertTrue(Chars.contains(ARRAY234, (char) 4));
	}

	public void testIndexOf() {
	assertEquals(-1, Chars.indexOf(EMPTY, (char) 1));
	assertEquals(-1, Chars.indexOf(ARRAY1, (char) 2));
	assertEquals(-1, Chars.indexOf(ARRAY234, (char) 1));
	assertEquals(0, Chars.indexOf(new char[] {(char) -1}, (char) -1));
	assertEquals(0, Chars.indexOf(ARRAY234, (char) 2));
	assertEquals(1, Chars.indexOf(ARRAY234, (char) 3));
	assertEquals(2, Chars.indexOf(ARRAY234, (char) 4));
	assertEquals(1, Chars.indexOf(new char[] {(char) 2, (char) 3, (char) 2, (char) 3}, (char) 3));
	}

	public void testIndexOf_arrayTarget() {
	assertEquals(0, Chars.indexOf(EMPTY, EMPTY));
	assertEquals(0, Chars.indexOf(ARRAY234, EMPTY));
	assertEquals(-1, Chars.indexOf(EMPTY, ARRAY234));
	assertEquals(-1, Chars.indexOf(ARRAY234, ARRAY1));
	assertEquals(-1, Chars.indexOf(ARRAY1, ARRAY234));
	assertEquals(0, Chars.indexOf(ARRAY1, ARRAY1));
	assertEquals(0, Chars.indexOf(ARRAY234, ARRAY234));
	assertEquals(0, Chars.indexOf(ARRAY234, new char[] {(char) 2, (char) 3}));
	assertEquals(1, Chars.indexOf(ARRAY234, new char[] {(char) 3, (char) 4}));
	assertEquals(1, Chars.indexOf(ARRAY234, new char[] {(char) 3}));
	assertEquals(2, Chars.indexOf(ARRAY234, new char[] {(char) 4}));
	assertEquals(
	1,
	Chars.indexOf(
	new char[] {(char) 2, (char) 3, (char) 3, (char) 3, (char) 3}, new char[] {(char) 3}));
	assertEquals(
	2,
	Chars.indexOf(
	new char[] {(char) 2, (char) 3, (char) 2, (char) 3, (char) 4, (char) 2, (char) 3},
	new char[] {(char) 2, (char) 3, (char) 4}));
	assertEquals(
	1,
	Chars.indexOf(
	new char[] {(char) 2, (char) 2, (char) 3, (char) 4, (char) 2, (char) 3, (char) 4},
	new char[] {(char) 2, (char) 3, (char) 4}));
	assertEquals(
	-1,
	Chars.indexOf(
	new char[] {(char) 4, (char) 3, (char) 2}, new char[] {(char) 2, (char) 3, (char) 4}));
	}

	public void testLastIndexOf() {
	assertEquals(-1, Chars.lastIndexOf(EMPTY, (char) 1));
	assertEquals(-1, Chars.lastIndexOf(ARRAY1, (char) 2));
	assertEquals(-1, Chars.lastIndexOf(ARRAY234, (char) 1));
	assertEquals(0, Chars.lastIndexOf(new char[] {(char) -1}, (char) -1));
	assertEquals(0, Chars.lastIndexOf(ARRAY234, (char) 2));
	assertEquals(1, Chars.lastIndexOf(ARRAY234, (char) 3));
	assertEquals(2, Chars.lastIndexOf(ARRAY234, (char) 4));
	assertEquals(
	3, Chars.lastIndexOf(new char[] {(char) 2, (char) 3, (char) 2, (char) 3}, (char) 3));
	}

	public void testMax_noArgs() {
	try {
	Chars.max();
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testMax() {
	assertEquals(LEAST, Chars.max(LEAST));
	assertEquals(GREATEST, Chars.max(GREATEST));
	assertEquals(
	(char) 9, Chars.max((char) 8, (char) 6, (char) 7, (char) 5, (char) 3, (char) 0, (char) 9));
	}

	public void testMin_noArgs() {
	try {
	Chars.min();
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testMin() {
	assertEquals(LEAST, Chars.min(LEAST));
	assertEquals(GREATEST, Chars.min(GREATEST));
	assertEquals(
	(char) 0, Chars.min((char) 8, (char) 6, (char) 7, (char) 5, (char) 3, (char) 0, (char) 9));
	}

	public void testConstrainToRange() {
	assertEquals((char) 1, Chars.constrainToRange((char) 1, (char) 0, (char) 5));
	assertEquals((char) 1, Chars.constrainToRange((char) 1, (char) 1, (char) 5));
	assertEquals((char) 3, Chars.constrainToRange((char) 1, (char) 3, (char) 5));
	assertEquals((char) 254, Chars.constrainToRange((char) 255, (char) 250, (char) 254));
	assertEquals((char) 2, Chars.constrainToRange((char) 5, (char) 2, (char) 2));
	try {
	Chars.constrainToRange((char) 1, (char) 3, (char) 2);
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testConcat() {
	assertTrue(Arrays.equals(EMPTY, Chars.concat()));
	assertTrue(Arrays.equals(EMPTY, Chars.concat(EMPTY)));
	assertTrue(Arrays.equals(EMPTY, Chars.concat(EMPTY, EMPTY, EMPTY)));
	assertTrue(Arrays.equals(ARRAY1, Chars.concat(ARRAY1)));
	assertNotSame(ARRAY1, Chars.concat(ARRAY1));
	assertTrue(Arrays.equals(ARRAY1, Chars.concat(EMPTY, ARRAY1, EMPTY)));
	assertTrue(
	Arrays.equals(
	new char[] {(char) 1, (char) 1, (char) 1}, Chars.concat(ARRAY1, ARRAY1, ARRAY1)));
	assertTrue(
	Arrays.equals(
	new char[] {(char) 1, (char) 2, (char) 3, (char) 4}, Chars.concat(ARRAY1, ARRAY234)));
	}

	@GwtIncompatible // Chars.fromByteArray
	public void testFromByteArray() {
	assertEquals('\u2345', Chars.fromByteArray(new byte[] {0x23, 0x45, (byte) 0xDC}));
	assertEquals('\uFEDC', Chars.fromByteArray(new byte[] {(byte) 0xFE, (byte) 0xDC}));
	}

	@GwtIncompatible // Chars.fromByteArray
	public void testFromByteArrayFails() {
	try {
	Chars.fromByteArray(new byte[Chars.BYTES - 1]);
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	@GwtIncompatible // Chars.fromBytes
	public void testFromBytes() {
	assertEquals('\u2345', Chars.fromBytes((byte) 0x23, (byte) 0x45));
	assertEquals('\uFEDC', Chars.fromBytes((byte) 0xFE, (byte) 0xDC));
	}

	@GwtIncompatible // Chars.fromByteArray, Chars.toByteArray
	public void testByteArrayRoundTrips() {
	char c = 0;
	for (int hi = 0; hi < 256; hi++) {
	for (int lo = 0; lo < 256; lo++) {
	char result = Chars.fromByteArray(new byte[] {(byte) hi, (byte) lo});
	assertEquals(
	String.format(
	Locale.ROOT, "hi=%s, lo=%s, expected=%s, result=%s", hi, lo, (int) c, (int) result),
	c,
	result);

	byte[] bytes = Chars.toByteArray(c);
	assertEquals((byte) hi, bytes[0]);
	assertEquals((byte) lo, bytes[1]);

	c++;
	}
	}
	assertEquals((char) 0, c); // sanity check
	}

	@GwtIncompatible // Chars.fromByteArray, Chars.toByteArray
	public void testByteArrayRoundTripsFails() {
	try {
	Chars.fromByteArray(new byte[] {0x11});
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testEnsureCapacity() {
	assertSame(EMPTY, Chars.ensureCapacity(EMPTY, 0, 1));
	assertSame(ARRAY1, Chars.ensureCapacity(ARRAY1, 0, 1));
	assertSame(ARRAY1, Chars.ensureCapacity(ARRAY1, 1, 1));
	assertTrue(
	Arrays.equals(
	new char[] {(char) 1, (char) 0, (char) 0}, Chars.ensureCapacity(ARRAY1, 2, 1)));
	}

	public void testEnsureCapacity_fail() {
	try {
	Chars.ensureCapacity(ARRAY1, -1, 1);
	fail();
	} catch (IllegalArgumentException expected) {
	}
	try {
	// notice that this should even fail when no growth was needed
	Chars.ensureCapacity(ARRAY1, 1, -1);
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testJoin() {
	assertEquals("", Chars.join(",", EMPTY));
	assertEquals("1", Chars.join(",", '1'));
	assertEquals("1,2", Chars.join(",", '1', '2'));
	assertEquals("123", Chars.join("", '1', '2', '3'));
	}

	public void testLexicographicalComparator() {
	List<char[]> ordered =
	Arrays.asList(
	new char[] {},
	new char[] {LEAST},
	new char[] {LEAST, LEAST},
	new char[] {LEAST, (char) 1},
	new char[] {(char) 1},
	new char[] {(char) 1, LEAST},
	new char[] {GREATEST, GREATEST - (char) 1},
	new char[] {GREATEST, GREATEST},
	new char[] {GREATEST, GREATEST, GREATEST});

	Comparator<char[]> comparator = Chars.lexicographicalComparator();
	Helpers.testComparator(comparator, ordered);
	}

	@GwtIncompatible // SerializableTester
	public void testLexicographicalComparatorSerializable() {
	Comparator<char[]> comparator = Chars.lexicographicalComparator();
	assertSame(comparator, SerializableTester.reserialize(comparator));
	}

	public void testReverse() {
	testReverse(new char[] {}, new char[] {});
	testReverse(new char[] {'1'}, new char[] {'1'});
	testReverse(new char[] {'1', '2'}, new char[] {'2', '1'});
	testReverse(new char[] {'3', '1', '1'}, new char[] {'1', '1', '3'});
	testReverse(new char[] {'A', '1', 'B', '2'}, new char[] {'2', 'B', '1', 'A'});
	}

	private static void testReverse(char[] input, char[] expectedOutput) {
	input = Arrays.copyOf(input, input.length);
	Chars.reverse(input);
	assertTrue(Arrays.equals(expectedOutput, input));
	}

	private static void testReverse(char[] input, int fromIndex, int toIndex, char[] expectedOutput) {
	input = Arrays.copyOf(input, input.length);
	Chars.reverse(input, fromIndex, toIndex);
	assertTrue(Arrays.equals(expectedOutput, input));
	}

	public void testReverseIndexed() {
	testReverse(new char[] {}, 0, 0, new char[] {});
	testReverse(new char[] {'1'}, 0, 1, new char[] {'1'});
	testReverse(new char[] {'1', '2'}, 0, 2, new char[] {'2', '1'});
	testReverse(new char[] {'3', '1', '1'}, 0, 2, new char[] {'1', '3', '1'});
	testReverse(new char[] {'3', '1', '1'}, 0, 1, new char[] {'3', '1', '1'});
	testReverse(new char[] {'A', '1', 'B', '2'}, 1, 3, new char[] {'A', 'B', '1', '2'});
	}

	public void testSortDescending() {
	testSortDescending(new char[] {}, new char[] {});
	testSortDescending(new char[] {'1'}, new char[] {'1'});
	testSortDescending(new char[] {'1', '2'}, new char[] {'2', '1'});
	testSortDescending(new char[] {'1', '3', '1'}, new char[] {'3', '1', '1'});
	testSortDescending(new char[] {'A', '1', 'B', '2'}, new char[] {'B', 'A', '2', '1'});
	}

	private static void testSortDescending(char[] input, char[] expectedOutput) {
	input = Arrays.copyOf(input, input.length);
	Chars.sortDescending(input);
	assertTrue(Arrays.equals(expectedOutput, input));
	}

	private static void testSortDescending(
	char[] input, int fromIndex, int toIndex, char[] expectedOutput) {
	input = Arrays.copyOf(input, input.length);
	Chars.sortDescending(input, fromIndex, toIndex);
	assertTrue(Arrays.equals(expectedOutput, input));
	}

	public void testSortDescendingIndexed() {
	testSortDescending(new char[] {}, 0, 0, new char[] {});
	testSortDescending(new char[] {'1'}, 0, 1, new char[] {'1'});
	testSortDescending(new char[] {'1', '2'}, 0, 2, new char[] {'2', '1'});
	testSortDescending(new char[] {'1', '3', '1'}, 0, 2, new char[] {'3', '1', '1'});
	testSortDescending(new char[] {'1', '3', '1'}, 0, 1, new char[] {'1', '3', '1'});
	testSortDescending(new char[] {'A', '1', 'B', '2'}, 1, 3, new char[] {'A', 'B', '1', '2'});
	}

	public void testToArray() {
	// need explicit type parameter to avoid javac warning!?
	List<Character> none = Arrays.<Character>asList();
	assertTrue(Arrays.equals(EMPTY, Chars.toArray(none)));

	List<Character> one = Arrays.asList((char) 1);
	assertTrue(Arrays.equals(ARRAY1, Chars.toArray(one)));

	char[] array = {(char) 0, (char) 1, 'A'};

	List<Character> three = Arrays.asList((char) 0, (char) 1, 'A');
	assertTrue(Arrays.equals(array, Chars.toArray(three)));

	assertTrue(Arrays.equals(array, Chars.toArray(Chars.asList(array))));
	}

	public void testToArray_threadSafe() {
	for (int delta : new int[] {+1, 0, -1}) {
	for (int i = 0; i < VALUES.length; i++) {
	List<Character> list = Chars.asList(VALUES).subList(0, i);
	Collection<Character> misleadingSize = Helpers.misleadingSizeCollection(delta);
	misleadingSize.addAll(list);
	char[] arr = Chars.toArray(misleadingSize);
	assertEquals(i, arr.length);
	for (int j = 0; j < i; j++) {
	assertEquals(VALUES[j], arr[j]);
	}
	}
	}
	}

	public void testToArray_withNull() {
	List<Character> list = Arrays.asList((char) 0, (char) 1, null);
	try {
	Chars.toArray(list);
	fail();
	} catch (NullPointerException expected) {
	}
	}

	public void testAsList_isAView() {
	char[] array = {(char) 0, (char) 1};
	List<Character> list = Chars.asList(array);
	list.set(0, (char) 2);
	assertTrue(Arrays.equals(new char[] {(char) 2, (char) 1}, array));
	array[1] = (char) 3;
	assertEquals(Arrays.asList((char) 2, (char) 3), list);
	}

	public void testAsList_toArray_roundTrip() {
	char[] array = {(char) 0, (char) 1, (char) 2};
	List<Character> list = Chars.asList(array);
	char[] newArray = Chars.toArray(list);

	// Make sure it returned a copy
	list.set(0, (char) 4);
	assertTrue(Arrays.equals(new char[] {(char) 0, (char) 1, (char) 2}, newArray));
	newArray[1] = (char) 5;
	assertEquals((char) 1, (char) list.get(1));
	}

	// This test stems from a real bug found by andrewk
	public void testAsList_subList_toArray_roundTrip() {
	char[] array = {(char) 0, (char) 1, (char) 2, (char) 3};
	List<Character> list = Chars.asList(array);
	assertTrue(Arrays.equals(new char[] {(char) 1, (char) 2}, Chars.toArray(list.subList(1, 3))));
	assertTrue(Arrays.equals(new char[] {}, Chars.toArray(list.subList(2, 2))));
	}

	public void testAsListEmpty() {
	assertSame(Collections.emptyList(), Chars.asList(EMPTY));
	}

	@GwtIncompatible // NullPointerTester
	public void testNulls() {
	new NullPointerTester().testAllPublicStaticMethods(Chars.class);
	}
	}