diff --git a/tests/libs/CHECK.h b/tests/libs/CHECK.h
new file mode 100644
index 0000000..2575d5b
--- /dev/null
+++ b/tests/libs/CHECK.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#pragma once
+
+// Tests proper can use libbase, but libraries for testing dlopen()
+// should probably avoid dependencies other than ones we're specifically
+// trying to test.
+
+#include <assert.h>
+
+#define CHECK(e) \
+  ((e) ? static_cast<void>(0) : __assert2(__FILE__, __LINE__, __PRETTY_FUNCTION__, #e))