unit-test: Introduce unit tests to phosphor-objmgr

Move a function to make more testable and add a test case for it

Testing: Verified 100% test coverage in processing.cpp

Change-Id: I0a888009cfeb57bbc8ad295681bea00b79f2a23d
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/src/test/Makefile.am.include b/src/test/Makefile.am.include
new file mode 100644
index 0000000..a698753
--- /dev/null
+++ b/src/test/Makefile.am.include
@@ -0,0 +1,4 @@
+src_test_well_known_SOURCES = %reldir%/well_known.cpp src/processing.cpp
+
+check_PROGRAMS += \
+	%reldir%/well_known