1 files changed, 33 insertions, 0 deletions
diff --git a/vespajlib/src/test/java/com/yahoo/collections/MD5TestCase.java b/vespajlib/src/test/java/com/yahoo/collections/MD5TestCase.java
new file mode 100644
index 00000000000..a107b21abb1
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+++ b/vespajlib/src/test/java/com/yahoo/collections/MD5TestCase.java
@@ -0,0 +1,33 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.collections;
+
+/**
+ * @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
+ */
+public class MD5TestCase extends junit.framework.TestCase {
+    public void testMD5() {
+        MD5 md5 = new MD5();
+        int a = md5.hash("foobar");
+        int b = md5.hash("foobar");
+
+        assertEquals(a, b);
+
+        int c = md5.hash("foo");
+
+        assertTrue(a != c);
+        assertTrue(b != c);
+
+        //rudimentary check; see that all four bytes contain something:
+
+        assertTrue((a & 0xFF000000) != 0);
+        assertTrue((a & 0x00FF0000) != 0);
+        assertTrue((a & 0x0000FF00) != 0);
+        assertTrue((a & 0x000000FF) != 0);
+
+
+        assertTrue((c & 0xFF000000) != 0);
+        assertTrue((c & 0x00FF0000) != 0);
+        assertTrue((c & 0x0000FF00) != 0);
+        assertTrue((c & 0x000000FF) != 0);
+    }
+}