Update Makefile.in to include unit tests

src/Makefile.in

@@ -46,6 +46,7 @@ $%.o: %.c
 
 clean:
 	rm -f *.o depend
+	rm -f ./tests/*.o depend
 
 # Dependencies for the object files (automagically generated with
 # gcc -MM)
@@ -54,3 +55,54 @@ depend:
 	$(CC) -MM *.c > depend
 
 -include depend
+
+# ---- Unit tests (5e-like rules) ----
+.PHONY: tests check
+
+BINDIR        ?= ../bin
+TESTS_DIR     := tests
+TESTS_SRC     := $(TESTS_DIR)/tests_5e.c
+TESTS_BIN     := $(BINDIR)/tests_5e
+TESTS_OBJS    := $(TESTS_DIR)/tests_5e.o $(TESTS_DIR)/stubs_unit.o
+
+# Only what we need; add more .o if the linker asks
+TEST_LINK_OBJS := utils.o constants.o random.o
+
+$(BINDIR):
+	mkdir -p $(BINDIR)
+
+tests: $(TESTS_BIN)
+
+check: $(TESTS_BIN)
+	@echo "Running tests_5e..."
+	@$(TESTS_BIN)
+
+$(TESTS_BIN): $(TESTS_OBJS) $(TEST_LINK_OBJS) | $(BINDIR)
+	$(CC) $(CFLAGS) -o $@ $^ $(LFLAGS) $(LIBS) -lm
+
+$(TESTS_DIR)/tests_5e.o: $(TESTS_SRC)
+	$(CC) $(CFLAGS) -I. -c -o $@ $<
+
+$(TESTS_DIR)/stubs_unit.o: $(TESTS_DIR)/stubs_unit.c
+	$(CC) $(CFLAGS) -I. -c -o $@ $<
+
+# ---- Simulations (5e-like rules) ----
+.PHONY: sims run_sims
+
+SIMS_DIR      := tests
+SIMS_SRC      := $(SIMS_DIR)/sim_5e.c
+SIMS_BIN      := $(BINDIR)/sim_5e
+SIMS_OBJS     := $(SIMS_DIR)/sim_5e.o $(SIMS_DIR)/stubs_unit.o
+SIM_LINK_OBJS := utils.o constants.o random.o
+
+sims: $(SIMS_BIN)
+
+run_sims: $(SIMS_BIN)
+	@echo "Running sim_5e..."
+	@$(SIMS_BIN)
+
+$(SIMS_BIN): $(SIMS_OBJS) $(SIM_LINK_OBJS) | $(BINDIR)
+	$(CC) $(CFLAGS) -o $@ $^ $(LFLAGS) $(LIBS) -lm
+
+$(SIMS_DIR)/sim_5e.o: $(SIMS_SRC)
+	$(CC) $(CFLAGS) -I. -c -o $@ $<