Add separate makefile for tests

serial_link.mk

@@ -1,12 +0,0 @@
-CGREEN_LIB = $(BUILDDIR)/cgreen/build-c/src/libcgreen.a
-
-.phony testserial:
-testserial: $(CGREEN_LIB)
-	make -C $(SERIAL_DIR)/tests BUILDDIR=../../$(BUILDDIR)
-
-CGREEN_DIR = "$(CURDIR)/$(SERIAL_DIR)/cgreen/cgreen"
-CGREEN_BUILD_DIR = "$(CURDIR)/$(BUILDDIR)/cgreen"
-export CGREEN_DIR
-export CGREEN_BUILD_DIR
-$(CGREEN_LIB):
-	make -C $(SERIAL_DIR)/cgreen

serial_link_tests.mk

@@ -0,0 +1,13 @@
+CGREEN_LIB = $(BUILDDIR)/cgreen/build-c/src/libcgreen.a
+
+CGREEN_DIR = "$(CURDIR)/$(SERIAL_DIR)/cgreen/cgreen"
+CGREEN_BUILD_DIR = "$(CURDIR)/$(BUILDDIR)/cgreen"
+export CGREEN_DIR
+export CGREEN_BUILD_DIR
+$(CGREEN_LIB):
+	make -C $(SERIAL_DIR)/cgreen 
+
+.PHONY serialtest:
+serialtest : $(CGREEN_LIB)
+	@echo $(CGREEN_LIB)
+	make -C $(SERIAL_DIR)/tests BUILDDIR=../../$(BUILDDIR)