Fix messages in tests

They are not failing because of this right now, but future
tests would fail without this.
Concretely, since the Handler for any given main thread is
a singleton managed by the framework, the messages won't
be removed automatically. In particular, messages posted
with a delay have a large destructive potential, because
they will go through before the startInputViewInternal
method is called, because it's called with a message too (in
turn, this is because of working around framework bugs).

Bug: 11142685
Change-Id: If81a168efcfd7d93806ddc4ea432d438c45a3e1d

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -233,6 +233,8 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         private static final int MSG_REOPEN_DICTIONARIES = 5;
         private static final int MSG_ON_END_BATCH_INPUT = 6;
         private static final int MSG_RESET_CACHES = 7;
+        // Update this when adding new messages
+        private static final int MSG_LAST = MSG_RESET_CACHES;
 
         private static final int ARG1_NOT_GESTURE_INPUT = 0;
         private static final int ARG1_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
@@ -344,6 +346,13 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
             removeMessages(MSG_UPDATE_SHIFT_STATE);
         }
 
+        @UsedForTesting
+        public void removeAllMessages() {
+            for (int i = 0; i <= MSG_LAST; ++i) {
+                removeMessages(i);
+            }
+        }
+
         public void showGesturePreviewAndSuggestionStrip(final SuggestedWords suggestedWords,
                 final boolean dismissGestureFloatingPreviewText) {
             removeMessages(MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP);

tests/src/com/android/inputmethod/latin/InputTestsBase.java

@@ -193,6 +193,7 @@ public class InputTestsBase extends ServiceTestCase<LatinIMEForTests> {
 
     @Override
     protected void tearDown() {
+        mLatinIME.mHandler.removeAllMessages();
         setStringPreference(PREF_AUTO_CORRECTION_THRESHOLD, mPreviousAutoCorrectSetting,
                 DEFAULT_AUTO_CORRECTION_THRESHOLD);
         setDebugMode(mPreviousDebugSetting);