Basic tests implemented using cmocka

Makefile

@@ -27,6 +27,9 @@ ASMS = $(C_SOURCES:.c=.s)
 
 all: $(OBJECTS)
 
+test: test/test.elf
+	./test/test.elf
+
 %.o: %.c $(C_HEADERS)
 	@echo "CC $<"
 	@$(CC) $(CFLAGS) -c $< -o $@
@@ -41,6 +44,9 @@ driver: $(OBJECTS)
 run: driver
 	@./driver
 
+test/test.elf: test/test_ringbuf.o ringbuf.o
+	@$(CC) $(CFLAGS) $^ -o $@ -lpthread -lcmocka
+
 lib: $(OBJECTS)
 	@ar rcs librbuf.a ringbuf.o
 
@@ -64,4 +70,4 @@ tidy:
 format:
 	clang-format -i $(C_SOURCES) $(C_HEADERS)
 
-.PHONY: all clean format asm
+.PHONY: all clean format asm test