test: move test build logic into dedicated Makefile

tests/Makefile

@@ -1,38 +1,45 @@
+ROOT_DIR := $(abspath ..)
+
 CXX := gcc
 
 CXXFLAGS := -std=c++17 \
             -Wall \
             -Wextra \
             -Werror \
-            -Icore/include \
-            -Ilogger/include \
-            -Itests/helpers
+            -I$(ROOT_DIR)/core/include \
+            -I$(ROOT_DIR)/logger/include \
+            -Ihelpers
 
 LDFLAGS := -lstdc++
 
-BUILD_DIR := build
+BUILD_DIR := $(ROOT_DIR)/build
 
 
 RESULT_TEST_BIN := $(BUILD_DIR)/result_test
 LOGGER_TEST_BIN := $(BUILD_DIR)/logger_test
 SCOPED_FILE_TEST_BIN := $(BUILD_DIR)/scoped_file_test
 
-RESULT_TEST_SRC := tests/core/result_test.cpp
-LOGGER_TEST_SRC := tests/core/logger_test.cpp
-SCOPED_FILE_TEST_SRC := tests/helpers/scoped_file_test.cpp
 
-LOGGER_SRC := logger/src/logger.cpp
+RESULT_TEST_SRC := core/result_test.cpp
+LOGGER_TEST_SRC := core/logger_test.cpp
+SCOPED_FILE_TEST_SRC := helpers/scoped_file_test.cpp
+
+
+LOGGER_SRC := $(ROOT_DIR)/logger/src/logger.cpp
+
 
 .PHONY: all test clean
 
+
 all: test
 
+
 test: $(RESULT_TEST_BIN) \
       $(LOGGER_TEST_BIN) \
       $(SCOPED_FILE_TEST_BIN)
-	./$(RESULT_TEST_BIN)
-	./$(LOGGER_TEST_BIN)
-	./$(SCOPED_FILE_TEST_BIN)
+	$(RESULT_TEST_BIN)
+	$(LOGGER_TEST_BIN)
+	$(SCOPED_FILE_TEST_BIN)
 
 
 $(RESULT_TEST_BIN): $(RESULT_TEST_SRC)