Added base tests

CMakeLists.txt

@@ -5,17 +5,39 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 project(Cars)
 
+Include(FetchContent)
+
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
 set(SRC_LIST
     ElectricCar.cpp
     ElectricEngine.cpp
     HybridCar.cpp
-    main.cpp
     PetrolCar.cpp
     PetrolEngine.cpp
     Car.cpp
     InvalidGear.cpp
 )
 
-add_executable(${PROJECT_NAME} ${SRC_LIST})
+add_library(${PROJECT_NAME}-lib STATIC ${SRC_LIST})
+
+add_executable(${PROJECT_NAME} main.cpp)
+target_link_libraries(${PROJECT_NAME} ${PROJECT_NAME}-lib )
 target_compile_options(${PROJECT_NAME} PUBLIC -Wall -Wpedantic -Wextra)
 target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_SOURCE_DIR})
+
+enable_testing()
+
+add_executable(${PROJECT_NAME}-ut tests.cpp)
+target_link_libraries(${PROJECT_NAME}-ut ${PROJECT_NAME}-lib GTest::gtest_main)
+
+include(GoogleTest)
+gtest_discover_tests(${PROJECT_NAME}-ut)
+add_test(NAME runTests COMMAND ${PROJECT_NAME}-ut)

PetrolEngine.cpp

@@ -17,13 +17,20 @@ void PetrolEngine::changeGear(int gear)
     // -1 is for REAR
     // 0 is for NEUTRAL
 
-    if (gear <= -1 || gear >= gears_) {
+    if (gear < -1 || gear >= gears_) {
+        std::cout << gear << std::endl;
         throw InvalidGear("Incorrect gear change");
     }
-    if(std::abs(gear - gears_) != 1){
+    if(std::abs(gear - currentGear_) != 1 && std::abs(abs(gear) - abs(currentGear_)) != 0){
+        std::cout << std::abs(gear - currentGear_) << std::endl;
         throw InvalidGear("Incorrect gear change");
     }
 
     currentGear_ = gear;
     std::cout << __FUNCTION__ << std::endl;
 }
+
+int PetrolEngine::getCurrentGear()
+{
+    return currentGear_;
+}

PetrolEngine.hpp

@@ -6,6 +6,7 @@ class PetrolEngine
 public:
     PetrolEngine(int power, float capacity, int gears);
     void changeGear(int gear);
+    int getCurrentGear();
 
 private:
     int power_;         // in HP

tests.cpp

@@ -0,0 +1,30 @@
+#include <gtest/gtest.h>
+#include <stdexcept>
+#include "PetrolEngine.hpp"
+
+TEST(PetrolEngineTest, ValidGearChange) {
+    PetrolEngine engine(500, 2, 7);
+
+    EXPECT_EQ(engine.getCurrentGear(), 0);
+    engine.changeGear(1);
+    EXPECT_EQ(engine.getCurrentGear(), 1);
+    engine.changeGear(2);
+    EXPECT_EQ(engine.getCurrentGear(), 2);
+    engine.changeGear(1);
+    EXPECT_EQ(engine.getCurrentGear(), 1);
+    engine.changeGear(-1);
+    EXPECT_EQ(engine.getCurrentGear(), -1);
+}
+
+TEST(PetrolEngineTest, InvalidGearChange) {
+    PetrolEngine engine(500, 2, 7);
+
+    EXPECT_THROW(engine.changeGear(-2), InvalidGear);
+    EXPECT_THROW(engine.changeGear(8), InvalidGear);
+    EXPECT_THROW(engine.changeGear(9), InvalidGear);
+    engine.changeGear(1);
+    engine.changeGear(2);
+    EXPECT_THROW(engine.changeGear(-1), InvalidGear);
+    EXPECT_THROW(engine.changeGear(4), InvalidGear);
+
+}