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diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
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+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2013 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.latin;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.LargeTest;
+
+import com.android.inputmethod.latin.makedict.FormatSpec;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+@LargeTest
+public class BinaryDictionaryDecayingTests extends AndroidTestCase {
+    private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
+    private static final String TEST_LOCALE = "test";
+
+    private static final int DUMMY_PROBABILITY = 0;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        super.tearDown();
+    }
+
+    private void forcePassingShortTime(final BinaryDictionary binaryDictionary) {
+        binaryDictionary.flushWithGC();
+    }
+
+    private void forcePassingLongTime(final BinaryDictionary binaryDictionary) {
+        // Currently, probabilities are decayed when GC is run. All entries that have never been
+        // typed in 32 GCs are removed.
+        final int count = 32;
+        for (int i = 0; i < count; i++) {
+            binaryDictionary.flushWithGC();
+        }
+    }
+
+    private File createEmptyDictionaryAndGetFile(final String filename) throws IOException {
+        final File file = File.createTempFile(filename, TEST_DICT_FILE_EXTENSION,
+                getContext().getCacheDir());
+        Map<String, String> attributeMap = new HashMap<String, String>();
+        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
+                3 /* dictVersion */, attributeMap)) {
+            return file;
+        } else {
+            throw new IOException("Empty dictionary cannot be created.");
+        }
+    }
+
+    public void testAddValidAndInvalidWords() {
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+
+        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        assertFalse(binaryDictionary.isValidWord("a"));
+        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        assertFalse(binaryDictionary.isValidWord("a"));
+        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        assertFalse(binaryDictionary.isValidWord("a"));
+        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        assertTrue(binaryDictionary.isValidWord("a"));
+
+        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        assertTrue(binaryDictionary.isValidWord("b"));
+
+        final int unigramProbability = binaryDictionary.getFrequency("a");
+        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        assertFalse(binaryDictionary.isValidBigram("a", "b"));
+        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        assertFalse(binaryDictionary.isValidBigram("a", "b"));
+        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        assertFalse(binaryDictionary.isValidBigram("a", "b"));
+        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        assertTrue(binaryDictionary.isValidBigram("a", "b"));
+
+        binaryDictionary.addUnigramWord("c", DUMMY_PROBABILITY);
+        binaryDictionary.addBigramWords("a", "c", DUMMY_PROBABILITY);
+        assertTrue(binaryDictionary.isValidBigram("a", "c"));
+
+        binaryDictionary.close();
+        dictFile.delete();
+    }
+
+    // TODO: Add large tests.
+    public void testDecayingProbability() {
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        assertTrue(binaryDictionary.isValidWord("a"));
+        forcePassingShortTime(binaryDictionary);
+        assertFalse(binaryDictionary.isValidWord("a"));
+
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        forcePassingShortTime(binaryDictionary);
+        assertTrue(binaryDictionary.isValidWord("a"));
+        forcePassingLongTime(binaryDictionary);
+        assertFalse(binaryDictionary.isValidWord("a"));
+
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        assertTrue(binaryDictionary.isValidBigram("a", "b"));
+        forcePassingShortTime(binaryDictionary);
+        assertFalse(binaryDictionary.isValidBigram("a", "b"));
+
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        assertTrue(binaryDictionary.isValidBigram("a", "b"));
+        forcePassingShortTime(binaryDictionary);
+        assertTrue(binaryDictionary.isValidBigram("a", "b"));
+        forcePassingLongTime(binaryDictionary);
+        assertFalse(binaryDictionary.isValidBigram("a", "b"));
+
+        binaryDictionary.close();
+        dictFile.delete();
+    }
+}