diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
new file mode 100644
index 0000000..7a686e5
--- /dev/null
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
@@ -0,0 +1,106 @@
+/*
+ * 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.latin.dicttool;
+
+import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
+import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
+import com.android.inputmethod.latin.makedict.FusionDictionary;
+import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
+import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
+import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
+
+import junit.framework.TestCase;
+
+import java.io.File;
+import java.io.BufferedOutputStream;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.ArrayList;
+import java.util.HashMap;
+
+/**
+ * Unit tests for BinaryDictOffdeviceUtilsTests
+ */
+public class BinaryDictOffdeviceUtilsTests extends TestCase {
+    private static final int TEST_FREQ = 37; // Some arbitrary value unlikely to happen by chance
+
+    public void testGetRawDictWorks() throws IOException, UnsupportedFormatException {
+        // Create a thrice-compressed dictionary file.
+        final FusionDictionary dict = new FusionDictionary(new Node(),
+                new DictionaryOptions(new HashMap<String, String>(),
+                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+        dict.add("foo", TEST_FREQ, null, false /* isNotAWord */);
+        dict.add("fta", 1, null, false /* isNotAWord */);
+        dict.add("ftb", 1, null, false /* isNotAWord */);
+        dict.add("bar", 1, null, false /* isNotAWord */);
+        dict.add("fool", 1, null, false /* isNotAWord */);
+
+        final File dst = File.createTempFile("testGetRawDict", ".tmp");
+        final OutputStream out = Compress.getCompressedStream(
+                Compress.getCompressedStream(
+                        Compress.getCompressedStream(
+                                new BufferedOutputStream(new FileOutputStream(dst)))));
+
+        BinaryDictInputOutput.writeDictionaryBinary(out, dict, new FormatOptions(2, false));
+
+        // Test for an actually compressed dictionary and its contents
+        final BinaryDictOffdeviceUtils.DecoderChainSpec decodeSpec =
+                BinaryDictOffdeviceUtils.getRawBinaryDictionaryOrNull(dst);
+        for (final String step : decodeSpec.mDecoderSpec) {
+            assertEquals("Wrong decode spec", BinaryDictOffdeviceUtils.COMPRESSION, step);
+        }
+        assertEquals("Wrong decode spec", 3, decodeSpec.mDecoderSpec.size());
+        final FileInputStream inStream = new FileInputStream(decodeSpec.mFile);
+        final ByteBuffer buffer = inStream.getChannel().map(
+                FileChannel.MapMode.READ_ONLY, 0, decodeSpec.mFile.length());
+        final FusionDictionary resultDict = BinaryDictInputOutput.readDictionaryBinary(
+                new BinaryDictInputOutput.ByteBufferWrapper(buffer),
+                null /* dict : an optional dictionary to add words to, or null */);
+        assertEquals("Dictionary can't be read back correctly",
+                resultDict.findWordInTree(resultDict.mRoot, "foo").getFrequency(), TEST_FREQ);
+    }
+
+    public void testGetRawDictFails() throws IOException {
+        // Randomly create some 4k file containing garbage
+        final File dst = File.createTempFile("testGetRawDict", ".tmp");
+        final OutputStream out = new BufferedOutputStream(new FileOutputStream(dst));
+        for (int i = 0; i < 1024; ++i) {
+            out.write(0x12345678);
+        }
+        out.close();
+
+        // Test that a random data file actually fails
+        assertNull("Wrongly identified data file",
+                BinaryDictOffdeviceUtils.getRawBinaryDictionaryOrNull(dst));
+
+        final File gzDst = File.createTempFile("testGetRawDict", ".tmp");
+        final OutputStream gzOut =
+                Compress.getCompressedStream(new BufferedOutputStream(new FileOutputStream(gzDst)));
+        for (int i = 0; i < 1024; ++i) {
+            gzOut.write(0x12345678);
+        }
+        gzOut.close();
+
+        // Test that a compressed random data file actually fails
+        assertNull("Wrongly identified data file",
+                BinaryDictOffdeviceUtils.getRawBinaryDictionaryOrNull(gzDst));
+    }
+}
diff --git a/tools/dicttool/tests/etc/test-dicttool.sh b/tools/dicttool/tests/etc/test-dicttool.sh
index 1283be2..0f3ed6d 100755
--- a/tools/dicttool/tests/etc/test-dicttool.sh
+++ b/tools/dicttool/tests/etc/test-dicttool.sh
@@ -14,3 +14,4 @@
 # limitations under the License.
 
 java -classpath ${ANDROID_HOST_OUT}/framework/junit.jar:${ANDROID_HOST_OUT}/framework/dicttool_aosp.jar junit.textui.TestRunner com.android.inputmethod.latin.makedict.BinaryDictInputOutputTest
+java -classpath ${ANDROID_HOST_OUT}/framework/junit.jar:${ANDROID_HOST_OUT}/framework/dicttool_aosp.jar junit.textui.TestRunner com.android.inputmethod.latin.dicttool.BinaryDictOffdeviceUtilsTests