diff --git a/test/521-checker-array-set-null/src/Main.java b/test/521-checker-array-set-null/src/Main.java
new file mode 100644
index 0000000..74bb73f
--- /dev/null
+++ b/test/521-checker-array-set-null/src/Main.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+public class Main {
+  public static void main(String[] args) {
+    testWithNull(new Object[2]);
+    testWithUnknown(new Object[2], new Object());
+    testWithSame(new Object[2]);
+  }
+
+  /// CHECK-START: void Main.testWithNull(java.lang.Object[]) disassembly (after)
+  /// CHECK-NOT:      pAputObject
+  public static void testWithNull(Object[] o) {
+    o[0] = null;
+  }
+
+  /// CHECK-START: void Main.testWithUnknown(java.lang.Object[], java.lang.Object) disassembly (after)
+  /// CHECK:          pAputObject
+  public static void testWithUnknown(Object[] o, Object obj) {
+    o[0] = obj;
+  }
+
+  /// CHECK-START: void Main.testWithSame(java.lang.Object[]) disassembly (after)
+  /// CHECK-NOT:      pAputObject
+  public static void testWithSame(Object[] o) {
+    o[0] = o[1];
+  }
+}