/*
    * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    *
    * This code is free software; you can redistribute it and/or modify it
    * under the terms of the GNU General Public License version 2 only, as
    * published by the Free Software Foundation.
    *
    * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  /*
   *
   * @test
   * @bug 4533872 4915683 4922962 4985217 5017280 6242664 6588260
   * @summary Unit tests for supplementary character support (JSR-204)
   */
  
  public class Supplementary {
  
      public static void main(String[] args) {
          test1();        // Test for codePointAt(int index)
          test2();        // Test for codePointBefore(int index)
          test3();        // Test for indexOf(int ch)
          test4();        // Test for indexOf(int ch, int fromIndex)
          test5();        // Test for lastIndexOf(int ch)
          test6();        // Test for lastIndexOf(int ch, int fromIndex)
          test7();        // Test for String(int[] codePoint, int offset, int count)
          test8();        // Test for codePointCount(int beginIndex, int endIndex)
          test9();        // Test for offsetByCodePoints(int index, int offset)
          test10();       // Test for offsetByCodePoints(int index, int offset)
                          // To verify the fix for 6242664
      }
  
      /* Text strings which are used as input data.
       * The comment above each text string means the index of each 16-bit char
       * for convenience.
       */
      static final String[] input = {
        /*                               111     1     111111     22222
           0123     4     5678     9     012     3     456789     01234 */
          "abc\uD800\uDC00def\uD800\uD800ab\uD800\uDC00cdefa\uDC00bcdef",
        /*                          1     1111     1111     1     222
           0     12345     6789     0     1234     5678     9     012     */
          "\uD800defg\uD800hij\uD800\uDC00klm\uDC00nop\uDC00\uD800rt\uDC00",
        /*                          11     1     1111     1     112     222
           0     12345     6     78901     2     3456     7     890     123     */
          "\uDC00abcd\uDBFF\uDFFFefgh\uD800\uDC009ik\uDC00\uDC00lm\uDC00no\uD800",
        /*                                    111     111111     1 22     2
           0     1     2345     678     9     012     345678     9 01     2     */
          "\uD800\uDC00!#$\uD800%&\uD800\uDC00;+\uDC00<>;=^\uDC00\\@\uD800\uDC00",
  
          // includes an undefined supplementary character in Unicode 4.0.0
        /*                                    1     11     1     1111     1
           0     1     2345     6     789     0     12     3     4567     8     */
          "\uDB40\uDE00abc\uDE01\uDB40de\uDB40\uDE02f\uDB40\uDE03ghi\uDB40\uDE02",
  
          // all supplementary characters
        /*                                                             1     1
           0     1     2     3     4     5     6     7     8     9     0     1     */
          "\uD800\uDC00\uD800\uDC01\uD800\uDC02\uD800\uDC03\uD800\uDC04\uD800\uDC05"+
        /* 1     1     1     1     1     1     1     1     2     2     2     2
           2     3     4     5     6     7     8     9     0     1     2     3     */
          "\uD800\uDC06\uD800\uDC07\uD800\uDC08\uD800\uDC08\uD800\uDC09\uD800\uDC0A"+
        /* 2     2     2     2     2     2     3     3     3     3     3     3
           4     5     6     7     8     9     0     1     2     3     4     5     */
          "\uD800\uDC0B\uD800\uDC0C\uD800\uDC0D\uD800\uDC0A\uD800\uDC0F\uD800\uDC10"
      };
  
  
      /* Expected results for:
       *     test1(): for codePointAt()
       *
       * Each character in each array is the golden data for each text string
       * in the above input data. For example, the first data in each array is
       * for the first input string.
       */
      static final int[][] golden1 = {
          {'a',    0xD800,  0xDC00, 0x10000, 0xE0200, 0x10000},// codePointAt(0)
          {0xD800, 0x10000, 'g',    0xDC00,  0xE0202, 0xDC04}, // codePointAt(9)
          {'f',    0xDC00,  0xD800, 0xDC00,  0xDE02,  0xDC10}, // codePointAt(length-1)
          {'f',    'p',     0xDC00, '^',     0xE0202, 0xDC08}, // codePointAt() for a substring
      };
  
      /*
       * Test for codePointAt(int index) method
       */
     static void test1() {
 
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
 
             /*
              * Normal case
              */
             testCodePoint(At, s, 0, golden1[0][i]);
             testCodePoint(At, s, 9, golden1[1][i]);
             testCodePoint(At, s, s.length()-1, golden1[2][i]);
             testCodePoint(At, s.substring(17), 0, golden1[3][i]);
 
             /*
              * Abnormal case - verify that an exception is thrown.
              */
             testCodePoint(At, s, -1);
             testCodePoint(At, s, s.length());
         }
     }
 
 
     /* Expected results for:
      *     test2(): for codePointBefore()
      *
      * Each character in each array is the golden data for each text string
      * in the above input data. For example, the first data in each array is
      * for the first input string.
      */
     static final int[][] golden2 = {
         {'a',    0xD800, 0xDC00,  0xD800,  0xDB40,  0xD800}, // codePointBefore(1)
         {0xD800, 'l',    0x10000, 0xDC00,  0xDB40,  0xD800}, // codePointBefore(13)
         {'f',    0xDC00, 0xD800,  0x10000, 0xE0202, 0x10010},// codePointBefore(length)
         {'b',    'd',    'a',     0xDC00,  0xDE00,  0xDC00}, // codePointBefore() for a substring
     };
 
     /*
      * Test for codePointBefore(int index) method
      */
     static void test2() {
 
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
 
             /*
              * Normal case
              */
             testCodePoint(Before, s, 1, golden2[0][i]);
             testCodePoint(Before, s, 13, golden2[1][i]);
             testCodePoint(Before, s, s.length(), golden2[2][i]);
             testCodePoint(Before, s.substring(1), 1, golden2[3][i]);
 
             /*
              * Abnormal case - verify that an exception is thrown.
              */
             testCodePoint(Before, s, 0);
             testCodePoint(Before, s, s.length()+1);
         }
     }
 
 
     /* Expected results for:
      *     test3(): for indexOf(int ch)
      *     test4(): for indexOf(int ch, int fromIndex)
      *     test5(): for lastIndexOf(int ch)
      *     test6(): for lastIndexOf(int ch, int fromIndex)
      *
      * Unlike golden1 and golden2, golden3[m][] is the golden data for text
      * string in input[m].
      *
      * The meaning of each element in golden3[][n]
      *   golden3[][0]: character which is searched.
      *   golden3[][2]: the golden data for indexOf(int ch)
      *   From golden3[][2] to golden3[][n-1]:
      *       the golden data for indexOf(int ch, int fromIndex)
      *   The golden3[][n-2]: the golden data for lastIndexOf(int ch)
      *   From golden3[][1] to golden3[][n-2]:
      *       the golden data for lastIndexOf(int ch, int fromIndex)
      *
      *   In other words, the data format is
      *     { ch, -1, index1, index2, ..., -1}
      *   where index1, index2, ... are all indices of the ch occurrences.
      */
     static final int[][] golden3 = {
       /* ch       indices */
         {'b',     -1,  1, 11, 20,  -1},
         {0xD800,  -1,  0,  5,  9,  19, -1},
         {0xDC00,  -1,  0, 12, 16,  17, 20, -1},
         {0x10000, -1,  0,  8, 21,  -1},
         {0xE0202, -1,  9, 17, -1},
         {0x1000A, -1, 22, 30, -1}
     };
 
     /*
      * Test for indexOf(int ch) method
      */
     static void test3() {
 
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
 
             /*
              * Normal case
              */
             testIndexOf(s, golden3[i][0], golden3[i][2]);
 
             /*
              * Abnormal case - char which isn't included in the string.
              */
             testIndexOf(s, 'Z', -1);
             testIndexOf(s, 0xDB98, -1);
             testIndexOf(s, 0xDE76, -1);
             testIndexOf(s, 0x12345, -1);
             testIndexOf(s, -1, -1);
             testIndexOf(s, 0x110000, -1);
         }
     }
 
     /*
      * Test for indexOf(int ch, int fromIndex) method
      */
     static void test4() {
 
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
             int ch = golden3[i][0];
 
             /*
              * Normal case
              */
             int fromIndex = 0;
             for (int j = 2; j < golden3[i].length; j++) {
                 fromIndex = testIndexOf(s, fromIndex, ch,
                                         golden3[i][j]) + 1;
             }
 
             /*
              * Abnormal case1 - char is included in the string but fromIndex
              *                  is incorrect.
              */
             testIndexOf(s, -1, ch, golden3[i][2]);
             testIndexOf(s, s.length(), ch,
                         golden3[i][golden3[i].length-1]);
 
             /*
              * Abnormal case2 - char which isn't included in the string.
              */
             testIndexOf(s, 0, 'Z', -1);
             testIndexOf(s, 0, 0xDB98, -1);
             testIndexOf(s, 0, 0xDE76, -1);
             testIndexOf(s, 0, 0x12345, -1);
             testIndexOf(s, 0, -1, -1);
             testIndexOf(s, 0, 0x110000, -1);
         }
     }
 
     /*
      * Test for lastIndexOf(int ch) method
      */
     static void test5() {
 
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
 
             /*
              * Normal case
              */
             testLastIndexOf(s, golden3[i][0],
                         golden3[i][golden3[i].length-2]);
 
             /*
              * Abnormal case - char which isn't included in the string.
              */
             testLastIndexOf(s, 'Z', -1);
             testLastIndexOf(s, 0xDB98, -1);
             testLastIndexOf(s, 0xDE76, -1);
             testLastIndexOf(s, 0x12345, -1);
             testLastIndexOf(s, -1, -1);
             testLastIndexOf(s, 0x110000, -1);
         }
     }
 
     /*
      * Test for lastIndexOf(int ch, int fromIndex) method
      */
     static void test6() {
 
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
             int ch = golden3[i][0];
             int len = s.length();
 
             /*
              * Normal case
              */
             int fromIndex = len - 1;
             for (int j = golden3[i].length - 2; j > 0; j--) {
                 fromIndex = testLastIndexOf(s, fromIndex, ch,
                                         golden3[i][j]) - 1;
             }
 
             /*
              * Abnormal case1 - char is included in the string but fromIndex
              *                  is incorrect.
              */
             testLastIndexOf(s, -1, ch, golden3[i][1]);
             testLastIndexOf(s, len, ch, golden3[i][golden3[i].length-2]);
 
             /*
              * Abnormal case2 - char which isn't included in the string.
              */
             testLastIndexOf(s, len, 'Z', -1);
             testLastIndexOf(s, len, 0xDB98, -1);
             testLastIndexOf(s, len, 0xDE76, -1);
             testLastIndexOf(s, len, 0x12345, -1);
             testLastIndexOf(s, len, -1, -1);
             testLastIndexOf(s, len, 0x110000, -1);
         }
     }
 
     /**
      * Test for String(int[] codePoint, int offset, int count).
      */
     static void test7() {
         for (int i = 0; i < input.length; i++) {
             String s = input[i];
             int nCodePoints = 0;
             int c;
             for (int j = 0; j < s.length(); j += Character.charCount(c)) {
                 c = s.codePointAt(j);
                 nCodePoints++;
             }
             int[] codePoints = new int[nCodePoints];
             int count = 0, mid = 0, offset = 0;
             for (int j = 0; j < s.length(); j += Character.charCount(c)) {
                 if (mid == 0 && j >= s.length()/2) {
                     mid = j;
                     offset = count;
                 }
                 c = s.codePointAt(j);
                 codePoints[count++] = c;
             }
 
             String cps = new String(codePoints, 0, count);
             check(!s.equals(cps), "new String(int[]...) with input[" + i + "]");
 
             cps = new String(codePoints, 0, offset);
             check(!s.substring(0, mid).equals(cps),
                   "first half: new String(int[]...) with input[" + i + "]");
 
             cps = new String(codePoints, offset, count - offset);
             check(!s.substring(mid).equals(cps),
                   "second half: new String(int[]...) with input[" + i + "]");
 
             // test exceptions
             testNewString(null, 0, count, NullPointerException.class);
             testNewString(codePoints, -1, count, IndexOutOfBoundsException.class);
             testNewString(codePoints, 0, count+1, IndexOutOfBoundsException.class);
             testNewString(codePoints, offset, count, IndexOutOfBoundsException.class);
             testNewString(codePoints, offset, -1, IndexOutOfBoundsException.class);
             testNewString(codePoints, count, 1, IndexOutOfBoundsException.class);
             codePoints[offset] = -1;
             testNewString(codePoints, 0, count, IllegalArgumentException.class);
             codePoints[offset] = Character.MAX_CODE_POINT+1;
             testNewString(codePoints, 0, count, IllegalArgumentException.class);
         }
 
         {
             // 6588260: (str) ArrayIndexOutOfBoundsException when trying
             // to create a String from codePoints
             //int[] x = new int[Character.MAX_CODE_POINT+1];
             int[] x = new int[Character.MAX_CODE_POINT];
             for (int i = 0; i < x.length; i++)
                 if (i != 0xdbff) // For round-trip safety
                     x[i] = i;
             final String s = new String(x, 0, x.length);
             check(s.codePointCount(0, s.length()) != x.length,
                   "s.codePointCount(0, s.length()) != x.length");
             check(s.length() <= x.length,
                   "s.length() <= x.length");
             for (int i = 0, j = 0; i < x.length; i++) {
                 int c = s.codePointAt(j);
                 check(c != x[i], "c != x[i]");
                 j += Character.charCount(c);
             }
         }
     }
 
     /**
      * Test codePointCount(int, int)
      *
      * This test case assumes that
      * Character.codePointCount(CharSequence, int, int) works
      * correctly.
      */
     static void test8() {
         for (int i = 0; i < input.length; i++) {
             String str = input[i];
             int length = str.length();
             for (int j = 0; j <= length; j++) {
                 int result = str.codePointCount(j, length);
                 int expected = Character.codePointCount(str, j, length);
                 check(result != expected, "codePointCount(input["+i+"], "+j+", "+length+")",
                       result, expected);
                 // Create a substring of the text range. It shares the
                 // underlying char[] of the String str.
                 String substr = str.substring(j, length);
                 result = substr.codePointCount(0, substr.length());
                 check(result != expected, "substring:codePointCount(input["+i+"], "+j+", "+length+")",
                       result, expected);
             }
             for (int j = length; j >= 0; j--) {
                 int result = str.codePointCount(0, j);
                 int expected = Character.codePointCount(str, 0, j);
                 check(result != expected, "codePointCount(input["+i+"], 0, "+j+")",
                       result, expected);
                 String substr = str.substring(0, j);
                 result = substr.codePointCount(0, substr.length());
                 check(result != expected, "substring:codePointCount(input["+i+"], 0, "+j+")",
                       result, expected);
             }
 
             // test exceptions
             testCodePointCount(null, 0, 0, NullPointerException.class);
             testCodePointCount(str, -1, length, IndexOutOfBoundsException.class);
             testCodePointCount(str, 0, length+1, IndexOutOfBoundsException.class);
             testCodePointCount(str, length, length-1, IndexOutOfBoundsException.class);
         }
     }
 
     /**
      * Test offsetByCodePoints(int, int)
      *
      * This test case assumes that
      * Character.codePointCount(CharSequence, int, int) works
      * correctly.
      */
     static void test9() {
         for (int i = 0; i < input.length; i++) {
             String str = input[i];
             int length = str.length();
             for (int j = 0; j <= length; j++) {
                 int nCodePoints = Character.codePointCount(str, j, length);
                 int result = str.offsetByCodePoints(j, nCodePoints);
                 check(result != length,
                       "offsetByCodePoints(input["+i+"], "+j+", "+nCodePoints+")",
                       result, length);
                 result = str.offsetByCodePoints(length, -nCodePoints);
                 int expected = j;
                 if (j > 0 && j < length) {
                     int cp = str.codePointBefore(j+1);
                     if (Character.isSupplementaryCodePoint(cp)) {
                         expected--;
                     }
                 }
                 check(result != expected,
                       "offsetByCodePoints(input["+i+"], "+j+", "+(-nCodePoints)+")",
                       result, expected);
             }
             for (int j = length; j >= 0; j--) {
                 int nCodePoints = Character.codePointCount(str, 0, j);
                 int result = str.offsetByCodePoints(0, nCodePoints);
                 int expected = j;
                 if (j > 0 && j < length) {
                     int cp = str.codePointAt(j-1);
                      if (Character.isSupplementaryCodePoint(cp)) {
                         expected++;
                     }
                 }
                 check(result != expected,
                       "offsetByCodePoints(input["+i+"], 0, "+nCodePoints+")",
                       result, expected);
                 result = str.offsetByCodePoints(j, -nCodePoints);
                 check(result != 0,
                       "offsetByCodePoints(input["+i+"], "+j+", "+(-nCodePoints)+")",
                       result, 0);
             }
 
             // test exceptions
             testOffsetByCodePoints(null, 0, 0, NullPointerException.class);
             testOffsetByCodePoints(str, -1, length, IndexOutOfBoundsException.class);
             testOffsetByCodePoints(str, 0, length+1, IndexOutOfBoundsException.class);
             testOffsetByCodePoints(str, 1, -2, IndexOutOfBoundsException.class);
             testOffsetByCodePoints(str, length, length-1, IndexOutOfBoundsException.class);
             testOffsetByCodePoints(str, length, -(length+1), IndexOutOfBoundsException.class);
         }
     }
 
     /**
      * Test offsetByCodePoints(int, int) - to verify the fix for 6242664
      *
      * This test case assumes that
      * Character.codePointCount(CharSequence, int, int) works
      * correctly.
      */
     static void test10() {
         String header = "H\uD800e\uDFFFa\uDBFF\uDC00der<";
         for (int i = 0; i < input.length; i++) {
             String wholeString = header + input[i];
             String str = wholeString.substring(header.length());
             int length = str.length();
             for (int j = 0; j <= length; j++) {
                 int nCodePoints = Character.codePointCount(str, j, length);
                 int result = str.offsetByCodePoints(j, nCodePoints);
                 check(result != length,
                       "offsetByCodePoints(input["+i+"], "+j+", "+nCodePoints+")",
                       result, length);
                 result = str.offsetByCodePoints(length, -nCodePoints);
                 int expected = j;
                 if (j > 0 && j < length) {
                     int cp = str.codePointBefore(j+1);
                     if (Character.isSupplementaryCodePoint(cp)) {
                         expected--;
                     }
                 }
                 check(result != expected,
                       "offsetByCodePoints(input["+i+"], "+j+", "+(-nCodePoints)+")",
                       result, expected);
             }
             for (int j = length; j >= 0; j--) {
                 int nCodePoints = Character.codePointCount(str, 0, j);
                 int result = str.offsetByCodePoints(0, nCodePoints);
                 int expected = j;
                 if (j > 0 && j < length) {
                     int cp = str.codePointAt(j-1);
                      if (Character.isSupplementaryCodePoint(cp)) {
                         expected++;
                     }
                 }
                 check(result != expected,
                       "offsetByCodePoints(input["+i+"], 0, "+nCodePoints+")",
                       result, expected);
                 result = str.offsetByCodePoints(j, -nCodePoints);
                 check(result != 0,
                       "offsetByCodePoints(input["+i+"], "+j+", "+(-nCodePoints)+")",
                       result, 0);
             }
         }
     }
 
 
     static final boolean At = true, Before = false;
     static final boolean FIRST = true, LAST = false;
 
     static void testCodePoint(boolean isAt, String s, int index, int expected) {
         int c = isAt ? s.codePointAt(index) : s.codePointBefore(index);
 
         check(c != expected,
               "codePoint" + (isAt ? "At" : "Before") + "(" + index + ") for <"
               + s + ">", c, expected);
     }
 
     static void testCodePoint(boolean isAt, String s, int index) {
         boolean exceptionOccurred = false;
 
         try {
             int c = isAt ? s.codePointAt(index) : s.codePointBefore(index);
         }
         catch (StringIndexOutOfBoundsException e) {
             exceptionOccurred = true;
         }
         check(!exceptionOccurred,
               "codePoint" + (isAt ? "At" : "Before") + "(" + index + ") for <"
               + s + "> should throw StringIndexOutOfBoundsPointerException.");
     }
 
     static void testIndexOf(String s, int c, int expected) {
         testIndexOf2(s, c, expected);
         if (s.indexOf(c) != -1) {
             testIndexOf2(s + (char) c, c, expected);
             if (Character.isSupplementaryCodePoint(c)) {
                 char[] surrogates = Character.toChars(c);
                 testIndexOf2(s + new String(surrogates), c, expected);
                 testIndexOf2(s + surrogates[0], c, expected);
                 testIndexOf2(s + surrogates[1], c, expected);
                 testIndexOf2(new String(surrogates) + s, c, 0);
                 testIndexOf2(surrogates[0] + s, c, expected + 1);
                 testIndexOf2(surrogates[1] + s, c, expected + 1);
             }
         }
     }
 
     static void testIndexOf2(String s, int c, int expected) {
         int index = s.indexOf(c);
 
         check(index != expected,
               "indexOf(" + toHexString(c) + ") for <" + s + ">",
               index, expected);
     }
 
     static void testLastIndexOf(String s, int c, int expected) {
         testLastIndexOf2(s, c, expected);
         if (s.lastIndexOf(c) != -1) {
             testLastIndexOf2((char) c + s, c, expected + 1);
             if (Character.isSupplementaryCodePoint(c)) {
                 char[] surrogates = Character.toChars(c);
                 testLastIndexOf2(s + new String(surrogates), c, s.length());
                 testLastIndexOf2(s + surrogates[0], c, expected);
                 testLastIndexOf2(s + surrogates[1], c, expected);
                 testLastIndexOf2(new String(surrogates) + s, c, expected + 2);
                 testLastIndexOf2(surrogates[0] + s, c, expected + 1);
                 testLastIndexOf2(surrogates[1] + s, c, expected + 1);
             }
         }
     }
 
     static void testLastIndexOf2(String s, int c, int expected) {
         int index = s.lastIndexOf(c);
 
         check(index != expected,
               "lastIndexOf(" + toHexString(c) + ") for <" + s + ">",
               index, expected);
     }
 
     static int testIndexOf(String s, int fromIndex, int c, int expected) {
         int index = s.indexOf(c, fromIndex);
 
         check(index != expected,
               "indexOf(" + toHexString(c) + ", "
               + fromIndex + ") for <" + s + ">",
               index, expected);
 
         return index;
     }
 
     static int testLastIndexOf(String s, int fromIndex, int c, int expected) {
         int index = s.lastIndexOf(c, fromIndex);
 
         check(index != expected,
               "lastIndexOf(" + toHexString(c) + ", "
               + fromIndex + ") for <" + s + ">",
               index, expected);
 
         return index;
     }
 
     static void testNewString(int[] codePoints, int offset, int count, Class expectedException) {
         try {
             String s = new String(codePoints, offset, count);
         } catch (Exception e) {
             if (expectedException.isInstance(e)) {
                 return;
             }
             throw new RuntimeException("Error: Unexpected exception", e);
         }
         check(true, "new String(int[]...) didn't throw " + expectedException.getName());
     }
 
     static void testCodePointCount(String str, int beginIndex, int endIndex,
                                    Class expectedException) {
         try {
             int n = str.codePointCount(beginIndex, endIndex);
         } catch (Exception e) {
             if (expectedException.isInstance(e)) {
                 return;
             }
             throw new RuntimeException("Error: Unexpected exception", e);
         }
         check(true, "codePointCount() didn't throw " + expectedException.getName());
     }
 
     static void testOffsetByCodePoints(String str, int index, int offset,
                                        Class expectedException) {
         try {
             int n = str.offsetByCodePoints(index, offset);
         } catch (Exception e) {
             if (expectedException.isInstance(e)) {
                 return;
             }
             throw new RuntimeException("Error: Unexpected exception", e);
         }
         check(true, "offsetByCodePoints() didn't throw " + expectedException.getName());
     }
 
     static void check(boolean err, String msg) {
         if (err) {
             throw new RuntimeException("Error: " + msg);
         }
     }
 
     static void check(boolean err, String s, int got, int expected) {
         if (err) {
             throw new RuntimeException("Error: " + s
                                        + " returned an unexpected value. got "
                                        + toHexString(got)
                                        + ", expected "
                                        + toHexString(expected));
         }
     }
 
     private static String toHexString(int c) {
         return "0x" + Integer.toHexString(c);
     }
 }