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Diffstat (limited to 'luni/src/test/java/libcore/java/util/TimSortTest.java')
-rw-r--r-- | luni/src/test/java/libcore/java/util/TimSortTest.java | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/luni/src/test/java/libcore/java/util/TimSortTest.java b/luni/src/test/java/libcore/java/util/TimSortTest.java new file mode 100644 index 0000000..0e928ba --- /dev/null +++ b/luni/src/test/java/libcore/java/util/TimSortTest.java @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * 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 libcore.java.util; + +import junit.framework.TestCase; + +import java.util.Arrays; +import java.util.Comparator; + +/** + * This test is based on test data generated by + * https://github.com/abstools/java-timsort-bug/blob/master/TestTimSort.java + */ +public class TimSortTest extends TestCase { + + private static final Comparator<Integer> NATURAL_ORDER_COMPARATOR = new Comparator<Integer>() { + public int compare(Integer first, Integer second) { + return first.compareTo(second); + } + }; + + private static final int BAD_DATA_SIZE = 65536; + + private static int[] BAD_RUN_OFFSETS = { + 20204, 20221, 20237, 20255, 20289, 20363, 20521, 20837, 21469, 22733, 25260, 30315, + 40408, 40425, 40441, 40459, 40493, 40567, 40725, 41041, 41673, 42936, 45463, 50500, + 50517, 50533, 50551, 50585, 50659, 50817, 51133, 51764, 53027, 55536, 55553, 55569, + 55587, 55621, 55695, 55853, 56168, 56799, 58044, 58061, 58077, 58095, 58129, 58203, + 58360, 58675, 59288, 59305, 59321, 59339, 59373, 59446, 59603, 59900, 59917, 59933, + 59951, 59985, 60059, 60196, 60217, 60236, 60274, 60332, 60351, 60369, 60389, 60405, + }; + + public void testBug19493779WithComparable() throws Exception { + Integer[] array = createBugTriggerData(); + Arrays.sort(array); + // The bug caused an ArrayIndexOutOfBoundsException, but we check this anyway. + assertSorted(array); + } + + public void testBug19493779WithComparator() throws Exception { + Integer[] array = createBugTriggerData(); + Arrays.sort(array, NATURAL_ORDER_COMPARATOR); + // The bug caused an ArrayIndexOutOfBoundsException, but we check this anyway. + assertSorted(array); + } + + private static void assertSorted(Integer[] arrayToSort) { + for (int i = 1; i < arrayToSort.length; i++) { + if (arrayToSort[i - 1] > arrayToSort[i]) { + fail("Array not sorted at element " + i + ": " + Arrays.toString(arrayToSort)); + } + } + } + + private static Integer[] createBugTriggerData() { + final Integer zero = 0; + final Integer one = 1; + + Integer[] bugTriggerData = new Integer[BAD_DATA_SIZE]; + for (int i = 0; i < bugTriggerData.length; i++) { + bugTriggerData[i] = zero; + } + + for (int i = 0; i < BAD_RUN_OFFSETS.length; i++) { + bugTriggerData[BAD_RUN_OFFSETS[i]] = one; + } + return bugTriggerData; + } +}
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