From 3af2bcb68b5a228149cdd6ac518bcb91891583d2 Mon Sep 17 00:00:00 2001
From: Adrien Grand <jpountz@apache.org>
Date: Thu, 1 Nov 2012 11:18:11 +0000
Subject: [PATCH] LZ4: improve test coverage.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1404541 13f79535-47bb-0310-9956-ffa450edef68
---
 .../AbstractTestCompressionMode.java           | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/lucene/codecs/src/test/org/apache/lucene/codecs/compressing/AbstractTestCompressionMode.java b/lucene/codecs/src/test/org/apache/lucene/codecs/compressing/AbstractTestCompressionMode.java
index 5904d50ef87..234d7727116 100644
--- a/lucene/codecs/src/test/org/apache/lucene/codecs/compressing/AbstractTestCompressionMode.java
+++ b/lucene/codecs/src/test/org/apache/lucene/codecs/compressing/AbstractTestCompressionMode.java
@@ -38,6 +38,10 @@ public abstract class AbstractTestCompressionMode extends LuceneTestCase {
     final int length = random().nextBoolean()
         ? random().nextInt(20)
         : random().nextInt(192 * 1024);
+    return randomArray(length, max);
+  }
+
+  static byte[] randomArray(int length, int max) {
     final byte[] arr = new byte[length];
     for (int i = 0; i < arr.length; ++i) {
       arr[i] = (byte) RandomInts.randomIntBetween(random(), 0, max);
@@ -147,8 +151,8 @@ public abstract class AbstractTestCompressionMode extends LuceneTestCase {
     test(decompressed);
   }
 
-  public void testLongLiteralsAndMatchs() throws IOException {
-    // literals and matchs length > 16
+  public void testLongMatchs() throws IOException {
+    // match length > 16
     final byte[] decompressed = new byte[RandomInts.randomIntBetween(random(), 300, 1024)];
     for (int i = 0; i < decompressed.length; ++i) {
       decompressed[i] = (byte) i;
@@ -156,4 +160,14 @@ public abstract class AbstractTestCompressionMode extends LuceneTestCase {
     test(decompressed);
   }
 
+  public void testLongLiterals() throws IOException {
+    // long literals (length > 16) which are not the last literals
+    final byte[] decompressed = randomArray(RandomInts.randomIntBetween(random(), 400, 1024), 256);
+    final int matchRef = random().nextInt(30);
+    final int matchOff = RandomInts.randomIntBetween(random(), decompressed.length - 40, decompressed.length - 20);
+    final int matchLength = RandomInts.randomIntBetween(random(), 4, 10);
+    System.arraycopy(decompressed, matchRef, decompressed, matchOff, matchLength);
+    test(decompressed);
+  }
+
 }
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