diff -r 000000000000 -r 6474c204b198 mobile/android/tests/background/junit3/src/testhelpers/JPakeNumGeneratorFixed.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/tests/background/junit3/src/testhelpers/JPakeNumGeneratorFixed.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+package org.mozilla.gecko.background.testhelpers;
+
+import java.math.BigInteger;
+
+import org.mozilla.gecko.sync.jpake.JPakeNumGenerator;
+
+public class JPakeNumGeneratorFixed implements JPakeNumGenerator {
+  private String[] values;
+  private int index = 0;
+
+  public JPakeNumGeneratorFixed(String[] values) {
+    this.values = values;
+  }
+
+  @Override
+  public BigInteger generateFromRange(BigInteger r) {
+    BigInteger ret = new BigInteger(values[index], 16).mod(r);
+    index = (++index) % values.length;
+    return ret;
+  }
+}