Add a "unit-tests" sample application to perform unit testing.

ndk/sources/tests/test-LOCAL_CPPFLAGS/Android.mk

@@ -0,0 +1,17 @@
+# Test that LOCAL_CPPFLAGS only works for C++ sources
+#
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := test-LOCAL_CPPFLAGS
+LOCAL_SRC_FILES := test-LOCAL_CPPFLAGS-1.c \
+                   test-LOCAL_CPPFLAGS-2.cpp \
+
+LOCAL_CFLAGS   := -DBANANA=200
+
+# Note, the -UBANANA is only there to prevent a warning
+# the test works well without it.
+LOCAL_CPPFLAGS := -UBANANA -DBANANA=300
+
+include $(BUILD_SHARED_LIBRARY)

ndk/sources/tests/test-LOCAL_CPPFLAGS/test-LOCAL_CPPFLAGS-1.c

@@ -0,0 +1,10 @@
+#if !defined(BANANA)
+#  error LOCAL_CPPFLAGS does not work for C source file
+#endif
+#if BANANA != 200
+#  error LOCAL_CPPFLAGS does not work correctly for C source file
+#endif
+
+void  __banana_foo1(void)
+{
+}

ndk/sources/tests/test-LOCAL_CPPFLAGS/test-LOCAL_CPPFLAGS-2.cpp

@@ -0,0 +1,10 @@
+#if !defined(BANANA)
+#  error LOCAL_CPPFLAGS does not work for C++ source file
+#endif
+#if BANANA != 300
+#  error LOCAL_CPPFLAGS does not work correctly for C++ source file
+#endif
+
+void  __banana_foo2(void)
+{
+}