diff -r 000000000000 -r 6474c204b198 mobile/android/tests/background/junit3/src/testhelpers/MockSharedPreferences.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/tests/background/junit3/src/testhelpers/MockSharedPreferences.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,137 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+package org.mozilla.gecko.background.testhelpers;
+
+import android.content.SharedPreferences;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * A programmable mock content provider.
+ */
+public class MockSharedPreferences implements SharedPreferences, SharedPreferences.Editor {
+  private HashMap<String, Object> mValues;
+  private HashMap<String, Object> mTempValues;
+
+  public MockSharedPreferences() {
+    mValues = new HashMap<String, Object>();
+    mTempValues = new HashMap<String, Object>();
+  }
+
+  public Editor edit() {
+    return this;
+  }
+
+  public boolean contains(String key) {
+    return mValues.containsKey(key);
+  }
+
+  public Map<String, ?> getAll() {
+    return new HashMap<String, Object>(mValues);
+  }
+
+  public boolean getBoolean(String key, boolean defValue) {
+    if (mValues.containsKey(key)) {
+      return ((Boolean)mValues.get(key)).booleanValue();
+    }
+    return defValue;
+  }
+
+  public float getFloat(String key, float defValue) {
+    if (mValues.containsKey(key)) {
+      return ((Float)mValues.get(key)).floatValue();
+    }
+    return defValue;
+  }
+
+  public int getInt(String key, int defValue) {
+    if (mValues.containsKey(key)) {
+      return ((Integer)mValues.get(key)).intValue();
+    }
+    return defValue;
+  }
+
+  public long getLong(String key, long defValue) {
+    if (mValues.containsKey(key)) {
+      return ((Long)mValues.get(key)).longValue();
+    }
+    return defValue;
+  }
+
+  public String getString(String key, String defValue) {
+    if (mValues.containsKey(key))
+      return (String)mValues.get(key);
+    return defValue;
+  }
+
+  @SuppressWarnings("unchecked")
+  public Set<String> getStringSet(String key, Set<String> defValues) {
+    if (mValues.containsKey(key)) {
+      return (Set<String>) mValues.get(key);
+    }
+    return defValues;
+  }
+
+  public void registerOnSharedPreferenceChangeListener(
+    OnSharedPreferenceChangeListener listener) {
+    throw new UnsupportedOperationException();
+  }
+
+  public void unregisterOnSharedPreferenceChangeListener(
+    OnSharedPreferenceChangeListener listener) {
+    throw new UnsupportedOperationException();
+  }
+
+  public Editor putBoolean(String key, boolean value) {
+    mTempValues.put(key, Boolean.valueOf(value));
+    return this;
+  }
+
+  public Editor putFloat(String key, float value) {
+    mTempValues.put(key, value);
+    return this;
+  }
+
+  public Editor putInt(String key, int value) {
+    mTempValues.put(key, value);
+    return this;
+  }
+
+  public Editor putLong(String key, long value) {
+    mTempValues.put(key, value);
+    return this;
+  }
+
+  public Editor putString(String key, String value) {
+    mTempValues.put(key, value);
+    return this;
+  }
+
+  public Editor putStringSet(String key, Set<String> values) {
+    mTempValues.put(key, values);
+    return this;
+  }
+
+  public Editor remove(String key) {
+    mTempValues.remove(key);
+    return this;
+  }
+
+  public Editor clear() {
+    mTempValues.clear();
+    return this;
+  }
+
+  @SuppressWarnings("unchecked")
+  public boolean commit() {
+    mValues = (HashMap<String, Object>)mTempValues.clone();
+    return true;
+  }
+
+  public void apply() {
+    commit();
+  }
+}