[commons-codec] 07/07: MurmurHash3: Added random block sizes to incremental hash test.

[aherbert]

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aherbert pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-codec.git

commit 486d8a8ae45e9d9e0e44ffb6048e536491c59c1a
Author: aherbert <aherb...@apache.org>
AuthorDate: Thu Nov 21 15:54:10 2019 +0000

    MurmurHash3: Added random block sizes to incremental hash test.
---
 .../commons/codec/digest/MurmurHash3Test.java      | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/test/java/org/apache/commons/codec/digest/MurmurHash3Test.java 
b/src/test/java/org/apache/commons/codec/digest/MurmurHash3Test.java
index 79787f3..0443fe2 100644
--- a/src/test/java/org/apache/commons/codec/digest/MurmurHash3Test.java
+++ b/src/test/java/org/apache/commons/codec/digest/MurmurHash3Test.java
@@ -747,6 +747,10 @@ public class MurmurHash3Test {
             assertIncrementalHash32(bytes, seed, 4, 3);
             // Complete blocks
             assertIncrementalHash32(bytes, seed, 4, 16, 64);
+            // Some random blocks
+            for (int i = 0; i < 10; i++) {
+                assertIncrementalHash32x86(bytes, seed, 
createRandomBlocks(bytes.length));
+            }
         }
     }
 
@@ -801,6 +805,10 @@ public class MurmurHash3Test {
             assertIncrementalHash32x86(bytes, seed, 4, 3);
             // Complete blocks
             assertIncrementalHash32x86(bytes, seed, 4, 16, 64);
+            // Some random blocks
+            for (int i = 0; i < 10; i++) {
+                assertIncrementalHash32x86(bytes, seed, 
createRandomBlocks(bytes.length));
+            }
         }
     }
 
@@ -829,4 +837,23 @@ public class MurmurHash3Test {
             Assert.assertEquals("Hashes differ after no additional data", h1, 
inc.end());
         }
     }
+
+    /**
+     * Creates the random blocks of data to process up to max length.
+     *
+     * @param maxLength the max length
+     * @return the blocks
+     */
+    private static int[] createRandomBlocks(int maxLength) {
+        int[] blocks = new int[20];
+        int count = 0;
+        int length = 0;
+        while (count < blocks.length && length < maxLength) {
+            // range of 1 to 8 for up to two 4 byte blocks
+            final int size = ThreadLocalRandom.current().nextInt(1, 9);
+            blocks[count++] = size;
+            length += size;
+        }
+        return Arrays.copyOf(blocks, count);
+    }
 }