diff --git a/java/proguard.flags b/java/proguard.flags
index ac5b7df..d65924f 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -1,64 +1,11 @@
--keep class com.android.inputmethod.latin.BinaryDictionary {
-  int mDictLength;
-  <init>(...);
+# Keep classes and methods that have the @UsedForTesting annotation
+-keep @com.android.inputmethod.annotations.UsedForTesting class *
+-keepclassmembers class * {
+@com.android.inputmethod.annotations.UsedForTesting *;
 }
 
--keep class com.android.inputmethod.keyboard.ProximityInfo {
-  <init>(com.android.inputmethod.keyboard.ProximityInfo);
+# Keep classes and methods that have the @ExternallyReferenced annotation
+-keep @com.android.inputmethod.annotations.ExternallyReferenced class *
+-keepclassmembers class * {
+@com.android.inputmethod.annotations.ExternallyReferenced *;
 }
-
--keep class com.android.inputmethod.latin.Suggest {
-  <init>(...);
-  com.android.inputmethod.latin.SuggestedWords getSuggestions(...);
-}
-
--keep class com.android.inputmethod.latin.AutoCorrection {
-  java.lang.CharSequence getAutoCorrectionWord();
-}
-
--keep class com.android.inputmethod.latin.Utils {
-  boolean equalsIgnoreCase(...);
-}
-
--keep class com.android.inputmethod.latin.InputPointers {
-  *;
-}
-
--keep class com.android.inputmethod.latin.ResizableIntArray {
-  *;
-}
-
--keep class com.android.inputmethod.latin.spellcheck.SpellCheckerSettingsFragment {
-  *;
-}
-
--keep class com.android.inputmethod.keyboard.MainKeyboardView {
-  # Keep getter/setter methods for ObjectAnimator
-  int getLanguageOnSpacebarAnimAlpha();
-  void setLanguageOnSpacebarAnimAlpha(int);
-  int getAltCodeKeyWhileTypingAnimAlpha();
-  void setAltCodeKeyWhileTypingAnimAlpha(int);
-}
-
--keep class com.android.inputmethod.keyboard.MoreKeysKeyboard$Builder$MoreKeysKeyboardParams {
-  <init>(...);
-}
-
--keepclasseswithmembernames class * {
-    native <methods>;
-}
-
--keep class com.android.inputmethod.research.ResearchLogger {
-  void flush();
-  void publishCurrentLogUnit(...);
-}
-
--keep class com.android.inputmethod.keyboard.KeyboardLayoutSet$Builder {
-  void setTouchPositionCorrectionEnabled(...);
-}
-
-# The support library contains references to newer platform versions.
-# Don't warn about those in case this app is linking against an older
-# platform version.  We know about them, and they are safe.
--dontwarn android.support.v4.**
--dontwarn android.support.v13.**
diff --git a/java/src/com/android/inputmethod/annotations/ExternallyReferenced.java b/java/src/com/android/inputmethod/annotations/ExternallyReferenced.java
new file mode 100644
index 0000000..ea5f12c
--- /dev/null
+++ b/java/src/com/android/inputmethod/annotations/ExternallyReferenced.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.annotations;
+
+/**
+ * Denotes that the class, method or field should not be eliminated by ProGuard,
+ * because it is externally referenced. (See proguard.flags)
+ */
+public @interface ExternallyReferenced {
+}
diff --git a/java/src/com/android/inputmethod/annotations/UsedForTesting.java b/java/src/com/android/inputmethod/annotations/UsedForTesting.java
new file mode 100644
index 0000000..2ada091
--- /dev/null
+++ b/java/src/com/android/inputmethod/annotations/UsedForTesting.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.annotations;
+
+/**
+ * Denotes that the class, method or field should not be eliminated by ProGuard,
+ * so that unit tests can access it. (See proguard.flags)
+ */
+public @interface UsedForTesting {
+}
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
index ee373e7..4d5d7e1 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
@@ -34,6 +34,7 @@
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodSubtype;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.compat.EditorInfoCompatUtils;
 import com.android.inputmethod.keyboard.internal.KeyboardBuilder;
 import com.android.inputmethod.keyboard.internal.KeyboardParams;
@@ -265,7 +266,7 @@
             return this;
         }
 
-        // For test only
+        @UsedForTesting
         public void disableTouchPositionCorrectionDataForTest() {
             mParams.mDisableTouchPositionCorrectionDataForTest = true;
         }
diff --git a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
index 3e6f92c..5b6820f 100644
--- a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
@@ -41,6 +41,7 @@
 
 import com.android.inputmethod.accessibility.AccessibilityUtils;
 import com.android.inputmethod.accessibility.AccessibleKeyboardViewProxy;
+import com.android.inputmethod.annotations.ExternallyReferenced;
 import com.android.inputmethod.keyboard.PointerTracker.DrawingProxy;
 import com.android.inputmethod.keyboard.PointerTracker.TimerProxy;
 import com.android.inputmethod.keyboard.internal.KeyDrawParams;
@@ -417,20 +418,23 @@
         return animator;
     }
 
-    // Getter/setter methods for {@link ObjectAnimator}.
+    @ExternallyReferenced
     public int getLanguageOnSpacebarAnimAlpha() {
         return mLanguageOnSpacebarAnimAlpha;
     }
 
+    @ExternallyReferenced
     public void setLanguageOnSpacebarAnimAlpha(final int alpha) {
         mLanguageOnSpacebarAnimAlpha = alpha;
         invalidateKey(mSpaceKey);
     }
 
+    @ExternallyReferenced
     public int getAltCodeKeyWhileTypingAnimAlpha() {
         return mAltCodeKeyWhileTypingAnimAlpha;
     }
 
+    @ExternallyReferenced
     public void setAltCodeKeyWhileTypingAnimAlpha(final int alpha) {
         mAltCodeKeyWhileTypingAnimAlpha = alpha;
         updateAltCodeKeyWhileTyping();
diff --git a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
index d7d4be4..3826a39 100644
--- a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
@@ -20,6 +20,7 @@
 import android.graphics.drawable.Drawable;
 import android.view.View;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.internal.KeyboardBuilder;
 import com.android.inputmethod.keyboard.internal.KeyboardIconsSet;
 import com.android.inputmethod.keyboard.internal.KeyboardParams;
@@ -39,7 +40,7 @@
         return mDefaultKeyCoordX;
     }
 
-    /* package for test */
+    @UsedForTesting
     static class MoreKeysKeyboardParams extends KeyboardParams {
         public boolean mIsFixedOrder;
         /* package */int mTopRowAdjustment;
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
index b314a37..3634268 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
@@ -27,6 +27,7 @@
 import android.util.Xml;
 import android.view.InflateException;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.Key;
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.KeyboardId;
@@ -177,7 +178,7 @@
         return this;
     }
 
-    // For test only
+    @UsedForTesting
     public void disableTouchPositionCorrectionDataForTest() {
         mParams.mTouchPositionCorrection.setEnabled(false);
     }
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
index 3b7c6ad..c3875ac 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
@@ -19,6 +19,7 @@
 import android.content.Context;
 import android.content.res.Resources;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.CollectionUtils;
 import com.android.inputmethod.latin.R;
 
@@ -64,7 +65,7 @@
         loadStringResourcesInternal(context, RESOURCE_NAMES, R.string.english_ime_name);
     }
 
-    /* package for test */
+    @UsedForTesting
     void loadStringResourcesInternal(Context context, final String[] resourceNames,
             int referenceId) {
         final Resources res = context.getResources();
diff --git a/java/src/com/android/inputmethod/keyboard/internal/TouchPositionCorrection.java b/java/src/com/android/inputmethod/keyboard/internal/TouchPositionCorrection.java
index d8950a7..d7a2b6f 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/TouchPositionCorrection.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/TouchPositionCorrection.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.keyboard.internal;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.LatinImeLogger;
 
 public final class TouchPositionCorrection {
@@ -66,7 +67,7 @@
         }
     }
 
-    // For test only
+    @UsedForTesting
     public void setEnabled(final boolean enabled) {
         mEnabled = enabled;
     }
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 9c48aa1..8c005f0 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -81,7 +81,6 @@
     /**
      * Constructor for the binary dictionary. This is supposed to be called from the
      * dictionary factory.
-     * All implementations should pass null into flagArray, except for testing purposes.
      * @param context the context to access the environment from.
      * @param filename the name of the file to read through native code.
      * @param offset the offset of the dictionary data within the file.
@@ -174,7 +173,7 @@
         return suggestions;
     }
 
-    /* package for test */ boolean isValidDictionary() {
+    public boolean isValidDictionary() {
         return mNativeDict != 0;
     }
 
diff --git a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
index 8cdc2a0..fdd0250 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
@@ -267,8 +267,7 @@
 
     // This reloads the dictionary if required, and returns whether it's currently updating its
     // contents or not.
-    // @VisibleForTesting
-    boolean reloadDictionaryIfRequired() {
+    private boolean reloadDictionaryIfRequired() {
         synchronized (mUpdatingLock) {
             // If we need to update, start off a background task
             if (mRequiresReload) startDictionaryLoadingTaskLocked();
@@ -613,25 +612,6 @@
         }
     }
 
-    /**
-     * Used for testing purposes and in the spell checker
-     * This function will wait for loading from database to be done
-     */
-    void waitForDictionaryLoading() {
-        while (mUpdatingDictionary) {
-            try {
-                Thread.sleep(100);
-            } catch (InterruptedException e) {
-                //
-            }
-        }
-    }
-
-    protected final void blockingReloadDictionaryIfRequired() {
-        reloadDictionaryIfRequired();
-        waitForDictionaryLoading();
-    }
-
     // Local to reverseLookUp, but do not allocate each time.
     private final char[] mLookedUpString = new char[BinaryDictionary.MAX_WORD_LENGTH];
 
diff --git a/java/src/com/android/inputmethod/latin/InputPointers.java b/java/src/com/android/inputmethod/latin/InputPointers.java
index 6b48aab..7dffd96 100644
--- a/java/src/com/android/inputmethod/latin/InputPointers.java
+++ b/java/src/com/android/inputmethod/latin/InputPointers.java
@@ -16,6 +16,8 @@
 
 package com.android.inputmethod.latin;
 
+import com.android.inputmethod.annotations.UsedForTesting;
+
 // TODO: This class is not thread-safe.
 public final class InputPointers {
     private final int mDefaultCapacity;
@@ -39,7 +41,8 @@
         mTimes.add(index, time);
     }
 
-    public void addPointer(int x, int y, int pointerId, int time) {
+    @UsedForTesting
+    void addPointer(int x, int y, int pointerId, int time) {
         mXCoordinates.add(x);
         mYCoordinates.add(y);
         mPointerIds.add(pointerId);
@@ -66,7 +69,8 @@
      * @param startPos the starting index of the pointers in {@code src}.
      * @param length the number of pointers to be appended.
      */
-    public void append(InputPointers src, int startPos, int length) {
+    @UsedForTesting
+    void append(InputPointers src, int startPos, int length) {
         if (length == 0) {
             return;
         }
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 4cf6a51..869ce72 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -60,6 +60,7 @@
 
 import com.android.inputmethod.accessibility.AccessibilityUtils;
 import com.android.inputmethod.accessibility.AccessibleKeyboardViewProxy;
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.compat.CompatUtils;
 import com.android.inputmethod.compat.InputMethodManagerCompatWrapper;
 import com.android.inputmethod.compat.InputMethodServiceCompatUtils;
@@ -132,14 +133,14 @@
     private View mKeyPreviewBackingView;
     private View mSuggestionsContainer;
     private SuggestionStripView mSuggestionStripView;
-    /* package for tests */ Suggest mSuggest;
+    @UsedForTesting Suggest mSuggest;
     private CompletionInfo[] mApplicationSpecifiedCompletions;
     private ApplicationInfo mTargetApplicationInfo;
 
     private InputMethodManagerCompatWrapper mImm;
     private Resources mResources;
     private SharedPreferences mPrefs;
-    /* package for tests */ final KeyboardSwitcher mKeyboardSwitcher;
+    @UsedForTesting final KeyboardSwitcher mKeyboardSwitcher;
     private final SubtypeSwitcher mSubtypeSwitcher;
     private boolean mShouldSwitchToLastSubtype = true;
 
@@ -422,7 +423,7 @@
     }
 
     // Has to be package-visible for unit tests
-    /* package for test */
+    @UsedForTesting
     void loadSettings() {
         // Note that the calling sequence of onCreate() and onCurrentInputMethodSubtypeChanged()
         // is not guaranteed. It may even be called at the same time on a different thread.
@@ -1848,7 +1849,7 @@
 
     // TODO: make this private
     // Outside LatinIME, only used by the test suite.
-    /* package for tests */
+    @UsedForTesting
     boolean isShowingPunctuationList() {
         if (mSuggestionStripView == null) return false;
         return mCurrentSettings.mSuggestPuncList == mSuggestionStripView.getSuggestions();
@@ -2232,7 +2233,7 @@
 
     // TODO: Make this private
     // Outside LatinIME, only used by the {@link InputTestsBase} test suite.
-    /* package for test */
+    @UsedForTesting
     void loadKeyboard() {
         // When the device locale is changed in SetupWizard etc., this method may get called via
         // onConfigurationChanged before SoftInputWindow is shown.
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index f0e3b4e..fea7215 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -19,6 +19,7 @@
 import android.content.Context;
 import android.text.TextUtils;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
@@ -71,7 +72,8 @@
         mLocale = locale;
     }
 
-    /* package for test */ Suggest(final Context context, final File dictionary,
+    @UsedForTesting
+    Suggest(final Context context, final File dictionary,
             final long startOffset, final long length, final Locale locale) {
         final Dictionary mainDict = DictionaryFactory.createDictionaryForTest(context, dictionary,
                 startOffset, length /* useFullEditDistance */, false, locale);
diff --git a/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java
index e390111..7871977 100644
--- a/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java
@@ -18,6 +18,7 @@
 
 import android.util.Log;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.makedict.BinaryDictIOUtils;
 import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
 import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.FusionDictionaryBufferInterface;
@@ -129,7 +130,8 @@
     /**
      * Constructs a new FusionDictionary from BigramDictionaryInterface.
      */
-    /* packages for test */ static FusionDictionary constructFusionDictionary(
+    @UsedForTesting
+    static FusionDictionary constructFusionDictionary(
             final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams) {
         final FusionDictionary fusionDict = new FusionDictionary(new Node(),
                 new FusionDictionary.DictionaryOptions(new HashMap<String, String>(), false,
@@ -193,7 +195,8 @@
     /**
      * Adds all unigrams and bigrams in maps to OnAddWordListener.
      */
-    /* package for test */ static void addWordsFromWordMap(final Map<Integer, String> unigrams,
+    @UsedForTesting
+    static void addWordsFromWordMap(final Map<Integer, String> unigrams,
             final Map<Integer, Integer> frequencies,
             final Map<Integer, ArrayList<PendingAttribute>> bigrams, final OnAddWordListener to) {
         for (Map.Entry<Integer, String> entry : unigrams.entrySet()) {
diff --git a/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java b/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
index 3615fa1..639c9b9 100644
--- a/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
@@ -21,6 +21,7 @@
 import android.os.AsyncTask;
 import android.util.Log;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.UserHistoryDictIOUtils.BigramDictionaryInterface;
@@ -75,7 +76,7 @@
     private final SharedPreferences mPrefs;
 
     // Should always be false except when we use this class for test
-    /* package for test */ boolean isTest = false;
+    @UsedForTesting boolean isTest = false;
 
     private static final ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>
             sLangDictCache = CollectionUtils.newConcurrentHashMap();
@@ -390,6 +391,7 @@
         }
     }
 
+    @UsedForTesting
     void forceAddWordForTest(final String word1, final String word2, final boolean isValid) {
         mBigramListLock.lock();
         try {
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
index 40e089f..05f2d93 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.latin.makedict;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.CharEncoding;
 import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.FusionDictionaryBufferInterface;
@@ -167,6 +168,7 @@
      * @throws IOException
      * @throws UnsupportedFormatException
      */
+    @UsedForTesting
     public static int getTerminalPosition(final FusionDictionaryBufferInterface buffer,
             final String word) throws IOException, UnsupportedFormatException {
         if (word == null) return FormatSpec.NOT_VALID_WORD;
@@ -254,6 +256,7 @@
      * @throws IOException
      * @throws UnsupportedFormatException
      */
+    @UsedForTesting
     public static void deleteWord(final FusionDictionaryBufferInterface buffer,
             final String word) throws IOException, UnsupportedFormatException {
         buffer.position(0);
@@ -706,6 +709,8 @@
      * @throws UnsupportedFormatException
      */
     // TODO: Support batch insertion.
+    // TODO: Remove @UsedForTesting once UserHistoryDictionary is implemented by BinaryDictionary.
+    @UsedForTesting
     public static void insertWord(final FusionDictionaryBufferInterface buffer,
             final OutputStream destination, final String word, final int frequency,
             final ArrayList<WeightedString> bigramStrings,
@@ -959,6 +964,7 @@
      * @throws IOException
      * @throws UnsupportedFormatException
      */
+    @UsedForTesting
     public static CharGroupInfo findWordFromBuffer(final FusionDictionaryBufferInterface buffer,
             final String word) throws IOException, UnsupportedFormatException {
         int position = getTerminalPosition(buffer, word);
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
index 2d39094..277796d 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.latin.makedict;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
@@ -1651,6 +1652,7 @@
      * @param dict an optional dictionary to add words to, or null.
      * @return the created (or merged) dictionary.
      */
+    @UsedForTesting
     public static FusionDictionary readDictionaryBinary(
             final FusionDictionaryBufferInterface buffer, final FusionDictionary dict)
                     throws IOException, UnsupportedFormatException {
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerProximityInfo.java b/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerProximityInfo.java
index 11bb970..6c0d79c 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerProximityInfo.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerProximityInfo.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.latin.spellcheck;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.CollectionUtils;
 import com.android.inputmethod.latin.Constants;
@@ -23,7 +24,7 @@
 import java.util.TreeMap;
 
 public final class SpellCheckerProximityInfo {
-    /* public for test */
+    @UsedForTesting
     final public static int NUL = Constants.NOT_A_CODE;
 
     // This must be the same as MAX_PROXIMITY_CHARS_SIZE else it will not work inside