Start adding unit tests

Author: eriknyquist

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "unit_test/unity"]
+	path = unit_test/unity
+	url = https://github.com/ThrowTheSwitch/Unity

app_timer.c

@@ -559,7 +559,7 @@ app_timer_error_e app_timer_init(app_timer_hw_model_t *model)
 
     if (NULL == model)
     {
-        return APP_TIMER_INVALID_PARAM;
+        return APP_TIMER_NULL_PARAM;
     }
 
     if ((0u == model->max_count) ||

app_timer_api.h

@@ -148,10 +148,11 @@ typedef void (*app_timer_handler_t)(void *);
  */
 typedef enum
 {
-    APP_TIMER_OK,
-    APP_TIMER_INVALID_PARAM,
-    APP_TIMER_INVALID_STATE,
-    APP_TIMER_ERROR
+    APP_TIMER_OK,                   ///< Operation successful
+    APP_TIMER_NULL_PARAM,           ///< NULL pointer passed as parameter
+    APP_TIMER_INVALID_PARAM,        ///< Invalid data passed as parameter
+    APP_TIMER_INVALID_STATE,        ///< Operation not allowed in current state (has app_timer_init been called?)
+    APP_TIMER_ERROR                 ///< Unspecified internal error
 } app_timer_error_e;
 
 

unit_test/Makefile

@@ -0,0 +1,46 @@
+OUTPUT_DIR := build
+OBJ_DIR := $(OUTPUT_DIR)/obj
+
+ifeq ($(OS),Windows_NT)
+# Windows-specific vars; if you did a custom install of MinGW, or if you are using some
+# other compiler, then you might need to change some of these values
+    #BIN_DIR := C:/MinGW/bin
+    BIN_DIR := C:/msys64/mingw64/bin
+    GCC := $(BIN_DIR)/gcc
+    LD := $(BIN_DIR)/ld
+    MKDIR := mkdir -p
+    RMDIR := rm -rf
+else
+    ifeq ($(shell uname -s),Linux)
+# Linux-specific vars
+        GCC := gcc
+        LD := ld
+        MKDIR := mkdir -p
+        RMDIR := rm -rf
+    endif
+endif
+
+OUTPUT_DIR := build
+TEST_PROG := $(OUTPUT_DIR)/test_app_timer
+
+SRC_FILES := ../app_timer.c test_app_timer.c unity/src/unity.c
+INCLUDES := -Iunity/src -I../
+
+.PHONY: clean test
+
+default: test
+
+all: clean test
+
+test: $(TEST_PROG)
+
+$(TEST_PROG): $(OUTPUT_DIR)
+	$(GCC) $(SRC_FILES) $(INCLUDES) -o $(TEST_PROG)
+	./$(TEST_PROG)
+
+$(OUTPUT_DIR):
+	$(MKDIR) $(OUTPUT_DIR)
+
+clean:
+	@$(RMDIR) $(OUTPUT_DIR)
+	@echo "Outputs removed"