build: add test and test coverage targets to Makefile

Makefile

@@ -1,5 +1,5 @@
 CC = gcc
-CFLAGS = -Wall -Wextra -Iinclude
+CFLAGS = -Wall -Wextra -Iinclude -Itests
 LDFLAGS = -lraylib -lopengl32 -lgdi32 -lwinmm
 
 SRC = src/main.c src/chip8.c
@@ -7,15 +7,25 @@ OBJ = $(SRC:.c=.o)
 TARGET_DIR = .bin
 TARGET = $(TARGET_DIR)/chip.exe
 
+TEST_SRC = tests/test_chip8.c tests/munit.c
+TEST_OBJ = $(TEST_SRC:.c=.o)
+TEST_TARGET = $(TARGET_DIR)/test_chip8.exe
+TEST_LDFLAGS =
+
+COVERAGE_DIR = $(TARGET_DIR)/coverage
+
 # OS and shell command detection
 ifeq ($(OS),Windows_NT)
+    SHELL = cmd.exe
     MKDIR = if not exist $(TARGET_DIR) mkdir $(TARGET_DIR)
+    MKDIR_COV = if not exist .bin\coverage mkdir .bin\coverage
     CLOSE_CHIP = taskkill /f /im chip.exe 2>NUL || exit 0
-    CLEAN_CMD = if exist src\main.o del /f src\main.o & if exist src\chip8.o del /f src\chip8.o & if exist $(TARGET_DIR) rmdir /s /q $(TARGET_DIR)
+    CLEAN_CMD = del /f /q src\*.o tests\*.o 2>NUL & rmdir /s /q $(TARGET_DIR) 2>NUL
 else
     MKDIR = mkdir -p $(TARGET_DIR)
+    MKDIR_COV = mkdir -p $(COVERAGE_DIR)
     CLOSE_CHIP = killall chip 2>/dev/null || true
-    CLEAN_CMD = rm -f src/*.o && rm -rf $(TARGET_DIR)
+    CLEAN_CMD = rm -f src/*.o tests/*.o && rm -rf $(TARGET_DIR)
 endif
 
 all: $(TARGET)
@@ -25,13 +35,31 @@ $(TARGET): $(OBJ)
 	@$(MKDIR)
 	$(CC) $(OBJ) -o $(TARGET) $(LDFLAGS)
 
+$(TEST_TARGET): src/chip8.o $(TEST_OBJ)
+	@$(MKDIR)
+	$(CC) src/chip8.o $(TEST_OBJ) -o $(TEST_TARGET) $(TEST_LDFLAGS)
+
 %.o: %.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
 clean:
-	@$(CLEAN_CMD)
+	-@$(CLEAN_CMD)
 
 run: all
 	@$(TARGET) $(ROM)
 
-.PHONY: all clean run
+test: $(TEST_TARGET)
+	@$(TEST_TARGET)
+
+coverage:
+	@$(MAKE) clean
+	@$(MAKE) test CFLAGS="$(CFLAGS) --coverage -g -O0" TEST_LDFLAGS="--coverage"
+	@echo ====================================================
+	@echo              TEST COVERAGE SUMMARY
+	@echo ====================================================
+	gcovr -r . --exclude tests --exclude include
+	@$(MKDIR_COV)
+	gcovr -r . --exclude tests --exclude include --html-details -o $(COVERAGE_DIR)/index.html
+	@echo HTML report generated at: file:///C:/Users/sfree/Repositories/chip/.bin/coverage/index.html
+
+.PHONY: all clean run test coverage