test: Add first unit-test to verify factory

Verify the factory does what we expect.

Change-Id: Ied4fbe45b1b46c0cc5726c9d5e437a9cb92e6182
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index afed099..1b469cc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -8,3 +8,5 @@
                         -version-info 0:0:0 -shared
 libfirmwareblob_la_CXXFLAGS = $(PHOSPHOR_LOGGING_CFLAGS) \
                          -flto
+
+SUBDIRS = . test