Add test for weak symbols feature.

Bugs: android/ndk#837
Test: run_test.py
Change-Id: I8e353a2adc46dfd36bfc289ecb0ac0a7078b515c

tests/device/weak_symbols/jni/Android.mk

@@ -0,0 +1,11 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := unconditional
+LOCAL_SRC_FILES := unconditional.cpp
+LOCAL_STATIC_LIBRARIES := googletest_main
+LOCAL_CFLAGS := -D__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__
+LOCAL_LDLIBS := -landroid
+include $(BUILD_EXECUTABLE)
+
+$(call import-module,third_party/googletest)

tests/device/weak_symbols/jni/Application.mk

@@ -0,0 +1 @@
+APP_STL := c++_static

tests/device/weak_symbols/jni/unconditional.cpp

@@ -0,0 +1,23 @@
+#include <gtest/gtest.h>
+#include <android/trace.h>
+#include <android/api-level.h>
+
+TEST(weak_symbols, crash_if_call_unavailable) {
+   if (android_get_device_api_level() >= 29) {
+     GTEST_SKIP() << "Test only valid for post-API 29 devices";
+   }
+   // 4770 is a cookie example from
+   // http://cs/android/cts/hostsidetests/atrace/AtraceTestApp/jni/CtsTrace.cpp;l=30;rcl=214cc4d8356fdb1ba4a63ae5baf86c6d76074233
+   ASSERT_DEATH(ATrace_beginAsyncSection("ndk::asyncBeginEndSection", 4770), "");
+}
+
+TEST(weak_symbols, pass_if_call_available) {
+   if (android_get_device_api_level() < 29) {
+     GTEST_SKIP() << "Test not valid for pre-API 29 devices";
+   }
+   // 4770 is a cookie example from
+   // http://cs/android/cts/hostsidetests/atrace/AtraceTestApp/jni/CtsTrace.cpp;l=30;rcl=214cc4d8356fdb1ba4a63ae5baf86c6d76074233
+   ATrace_beginAsyncSection("ndk::asyncBeginEndSection", 4770);
+}
+
+