diff --git a/tests/dlext_test_library.cpp b/tests/dlext_test_library.cpp
new file mode 100644
index 0000000..5c04329
--- /dev/null
+++ b/tests/dlext_test_library.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+class A {
+public:
+  virtual int getRandomNumber() {
+    return 4;  // chosen by fair dice roll.
+               // guaranteed to be random.
+  }
+
+  virtual ~A() {}
+};
+
+A a;
+
+// nested macros to make it easy to define a large amount of read-only data
+// which will require relocation.
+#define A_16 &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a,
+#define A_128 A_16 A_16 A_16 A_16 A_16 A_16 A_16 A_16
+#define A_1024 A_128 A_128 A_128 A_128 A_128 A_128 A_128 A_128
+
+extern "C" A* const lots_of_relro[] = {
+  A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024
+};
+
+extern "C" int getRandomNumber() {
+  // access the relro section (twice, in fact, once for the pointer, and once
+  // for the vtable of A) to check it's actually there.
+  return lots_of_relro[0]->getRandomNumber();
+}