diff --git a/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java
index a787ef1..d626ff9 100644
--- a/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java
@@ -29,7 +29,6 @@
 import android.text.TextUtils;
 import android.util.Log;
 
-import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.personalization.AccountUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
 
@@ -73,8 +72,13 @@
     private final boolean mUseFirstLastBigrams;
 
     public ContactsBinaryDictionary(final Context context, final Locale locale) {
-        super(context, getDictNameWithLocale(NAME, locale), locale,
-                Dictionary.TYPE_CONTACTS, false /* isUpdatable */);
+        this(context, locale, null /* dictFile */);
+    }
+
+    public ContactsBinaryDictionary(final Context context, final Locale locale,
+            final File dictFile) {
+        super(context, getDictName(NAME, locale, dictFile), locale, Dictionary.TYPE_CONTACTS,
+                false /* isUpdatable */, dictFile);
         mLocale = locale;
         mUseFirstLastBigrams = useFirstLastBigramsForLocale(locale);
         registerObserver(context);
@@ -84,12 +88,6 @@
         loadDictionary();
     }
 
-    // Dummy constructor for tests.
-    @UsedForTesting
-    public ContactsBinaryDictionary(final Context context, final Locale locale, final File file) {
-        this(context, locale);
-    }
-
     private synchronized void registerObserver(final Context context) {
         // Perform a managed query. The Activity will handle closing and requerying the cursor
         // when needed.
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index c2451ce..251583c 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -213,15 +213,10 @@
      * @param dictType the dictionary type, as a human-readable string
      * @param isUpdatable whether to support dynamically updating the dictionary. Please note that
      *        dynamic dictionary has negative effects on memory space and computation time.
+     * @param dictFile dictionary file path. if null, use default dictionary path based on
+     *        dictionary type.
      */
     public ExpandableBinaryDictionary(final Context context, final String dictName,
-            final Locale locale, final String dictType, final boolean isUpdatable) {
-        this(context, dictName, locale, dictType, isUpdatable,
-                new File(context.getFilesDir(), dictName + DICT_FILE_EXTENSION));
-    }
-
-    // Creates an instance that uses a given dictionary file.
-    public ExpandableBinaryDictionary(final Context context, final String dictName,
             final Locale locale, final String dictType, final boolean isUpdatable,
             final File dictFile) {
         super(dictType);
@@ -229,15 +224,17 @@
         mContext = context;
         mLocale = locale;
         mIsUpdatable = isUpdatable;
-        mDictFile = dictFile;
+        mDictFile = (dictFile != null) ? dictFile
+                : new File(context.getFilesDir(), dictName + DICT_FILE_EXTENSION);
         mBinaryDictionary = null;
         mDictNameDictionaryUpdateController = getDictionaryUpdateController(dictName);
         // Currently, only dynamic personalization dictionary is updatable.
         mDictionaryWriter = getDictionaryWriter(isUpdatable);
     }
 
-    protected static String getDictNameWithLocale(final String name, final Locale locale) {
-        return name + "." + locale.toString();
+    protected static String getDictName(final String name, final Locale locale,
+            final File dictFile) {
+        return dictFile != null ? dictFile.getName() : name + "." + locale.toString();
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java b/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java
index 9ccd9e4..801fb5b 100644
--- a/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java
@@ -28,12 +28,12 @@
     private final Object mLock = new Object();
 
     public SynchronouslyLoadedUserBinaryDictionary(final Context context, final Locale locale) {
-        this(context, locale, false);
+        this(context, locale, false /* alsoUseMoreRestrictiveLocales */);
     }
 
     public SynchronouslyLoadedUserBinaryDictionary(final Context context, final Locale locale,
             final boolean alsoUseMoreRestrictiveLocales) {
-        super(context, locale, alsoUseMoreRestrictiveLocales);
+        super(context, locale, alsoUseMoreRestrictiveLocales, null /* dictFile */);
     }
 
     @Override
diff --git a/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java b/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java
index 8011247..2a195f5 100644
--- a/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java
@@ -28,7 +28,6 @@
 import android.text.TextUtils;
 import android.util.Log;
 
-import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.compat.UserDictionaryCompatUtils;
 import com.android.inputmethod.latin.utils.LocaleUtils;
 import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
@@ -78,19 +77,17 @@
     final public boolean mEnabled;
 
     public UserBinaryDictionary(final Context context, final Locale locale) {
-        this(context, locale, false);
+        this(context, locale, false /* alsoUseMoreRestrictiveLocales */, null /* dictFile */);
     }
 
-    // Dummy constructor for tests.
-    @UsedForTesting
-    public UserBinaryDictionary(final Context context, final Locale locale, final File file) {
-        this(context, locale);
+    public UserBinaryDictionary(final Context context, final Locale locale, final File dictFile) {
+        this(context, locale, false /* alsoUseMoreRestrictiveLocales */, dictFile);
     }
 
     public UserBinaryDictionary(final Context context, final Locale locale,
-            final boolean alsoUseMoreRestrictiveLocales) {
-        super(context, getDictNameWithLocale(NAME, locale), locale, Dictionary.TYPE_USER,
-                false /* isUpdatable */);
+            final boolean alsoUseMoreRestrictiveLocales, final File dictFile) {
+        super(context, getDictName(NAME, locale, dictFile), locale, Dictionary.TYPE_USER,
+                false /* isUpdatable */, dictFile);
         if (null == locale) throw new NullPointerException(); // Catch the error earlier
         final String localeStr = locale.toString();
         if (SubtypeLocaleUtils.NO_LANGUAGE.equals(localeStr)) {
diff --git a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index 6a7a336..9c74c24 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -52,21 +52,10 @@
     private final String mDictName;
 
     /* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
-            final Locale locale, final String dictionaryType, final String dictName) {
-        super(context, dictName, locale, dictionaryType, true);
-        mLocale = locale;
-        mDictName = dictName;
-        if (mLocale != null && mLocale.toString().length() > 1) {
-            reloadDictionaryIfRequired();
-        }
-    }
-
-    // Creates an instance that uses a given dictionary file for testing.
-    @UsedForTesting
-    /* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
-            final Locale locale, final String dictionaryType, final String dictName,
+            final String dictName, final Locale locale, final String dictionaryType,
             final File dictFile) {
-        super(context, dictName, locale, dictionaryType, true, dictFile);
+        super(context, getDictName(dictName, locale, dictFile), locale, dictionaryType,
+                true /* isUpdatable */, dictFile);
         mLocale = locale;
         mDictName = dictName;
         if (mLocale != null && mLocale.toString().length() > 1) {
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java
index 6526148..4afd5b4 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java
@@ -16,27 +16,23 @@
 
 package com.android.inputmethod.latin.personalization;
 
-import com.android.inputmethod.annotations.UsedForTesting;
+import android.content.Context;
+
 import com.android.inputmethod.latin.Dictionary;
 
 import java.io.File;
 import java.util.Locale;
 
-import android.content.Context;
-
 public class PersonalizationDictionary extends DecayingExpandableBinaryDictionaryBase {
     /* package */ static final String NAME = PersonalizationDictionary.class.getSimpleName();
 
     /* package */ PersonalizationDictionary(final Context context, final Locale locale) {
-        super(context, locale, Dictionary.TYPE_PERSONALIZATION,
-                getDictNameWithLocale(NAME, locale));
+        this(context, locale, null /* dictFile */);
     }
 
-    // Creates an instance that uses a given dictionary file for testing.
-    @UsedForTesting
     public PersonalizationDictionary(final Context context, final Locale locale,
             final File dictFile) {
-        super(context, locale, Dictionary.TYPE_PERSONALIZATION, getDictNameWithLocale(NAME, locale),
+        super(context, getDictName(NAME, locale, dictFile), locale, Dictionary.TYPE_PERSONALIZATION,
                 dictFile);
     }
 
diff --git a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
index 6778c23..504e9b2 100644
--- a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
@@ -16,29 +16,27 @@
 
 package com.android.inputmethod.latin.personalization;
 
-import com.android.inputmethod.annotations.UsedForTesting;
+import android.content.Context;
+
 import com.android.inputmethod.latin.Dictionary;
 
 import java.io.File;
 import java.util.Locale;
 
-import android.content.Context;
-
 /**
  * Locally gathers stats about the words user types and various other signals like auto-correction
  * cancellation or manual picks. This allows the keyboard to adapt to the typist over time.
  */
 public class UserHistoryDictionary extends DecayingExpandableBinaryDictionaryBase {
     /* package */ static final String NAME = UserHistoryDictionary.class.getSimpleName();
+
     /* package */ UserHistoryDictionary(final Context context, final Locale locale) {
-        super(context, locale, Dictionary.TYPE_USER_HISTORY, getDictNameWithLocale(NAME, locale));
+        this(context, locale, null /* dictFile */);
     }
 
-    // Creates an instance that uses a given dictionary file for testing.
-    @UsedForTesting
     public UserHistoryDictionary(final Context context, final Locale locale,
             final File dictFile) {
-        super(context, locale, Dictionary.TYPE_USER_HISTORY, getDictNameWithLocale(NAME, locale),
+        super(context, getDictName(NAME, locale, dictFile), locale, Dictionary.TYPE_USER_HISTORY,
                 dictFile);
     }