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diff --git a/javatests/com/android/loganalysis/util/ArrayUtilTest.java b/javatests/com/android/loganalysis/util/ArrayUtilTest.java
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+++ b/javatests/com/android/loganalysis/util/ArrayUtilTest.java
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+/*
+ * Copyright (C) 2011 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.loganalysis.util;
+
+import junit.framework.TestCase;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Unit tests for {@link ArrayUtil}
+ */
+public class ArrayUtilTest extends TestCase {
+
+    /**
+     * Simple test for {@link ArrayUtil#buildArray(String[][])}
+     */
+    public void testBuildArray_arrays() {
+        String[] newArray = ArrayUtil.buildArray(new String[] {"1", "2"}, new String[] {"3"},
+                new String[] {"4"});
+        assertEquals(4, newArray.length);
+        for (int i = 0; i < 4; i++) {
+            assertEquals(Integer.toString(i+1), newArray[i]);
+        }
+    }
+
+    /**
+     * Make sure that Collections aren't double-wrapped
+     */
+    public void testJoinCollection() {
+        List<String> list = Arrays.asList("alpha", "beta", "gamma");
+        final String expected = "alpha, beta, gamma";
+        String str = ArrayUtil.join(", ", list);
+        assertEquals(expected, str);
+    }
+
+    /**
+     * Make sure that Arrays aren't double-wrapped
+     */
+    public void testJoinArray() {
+        String[] ary = new String[] {"alpha", "beta", "gamma"};
+        final String expected = "alpha, beta, gamma";
+        String str = ArrayUtil.join(", ", (Object[]) ary);
+        assertEquals(expected, str);
+    }
+
+    /**
+     * Make sure that join on varargs arrays work as expected
+     */
+    public void testJoinNormal() {
+        final String expected = "alpha, beta, gamma";
+        String str = ArrayUtil.join(", ", "alpha", "beta", "gamma");
+        assertEquals(expected, str);
+    }
+}