Add root CMakeLists.txt. Add googletest submodule. Add some unit tests

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "src/zxing-cpp"]
 	path = src/zxing-cpp
 	url = https://github.com/nu-book/zxing-cpp.git
+[submodule "3rdParty/googletest"]
+	path = 3rdParty/googletest
+	url = https://github.com/google/googletest.git

CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.16)
+project(QmlBarcode LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(QT NAMES Qt5 Qt6)
+find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Multimedia Concurrent Quick REQUIRED)
+
+
+set(BUILD_GMOCK OFF)
+add_subdirectory(3rdParty/googletest)
+add_subdirectory(src)
+add_subdirectory(examples/QmlBarcodeReader)
+add_subdirectory(examples/QmlBarcodeGenerator)
+add_subdirectory(tests)

examples/QmlBarcodeGenerator/CMakeLists.txt

@@ -10,17 +10,12 @@ set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-#Check this file for any *_DIR variable definitions and other
-include("cmake/Locations.cmake")
-
 if(Qt${QT_VERSION_MAJOR} STREQUAL Qt5)
     qt5_add_resources(RSCS qml.qrc)
 else()
     qt_add_resources(RSCS qml.qrc)
 endif()
 
-add_subdirectory(${LIB_DIR} ${CMAKE_BINARY_DIR}/SCodes)
-
 if(ANDROID)
 
     if(Qt${QT_VERSION_MAJOR} STREQUAL Qt5)
@@ -56,8 +51,7 @@ else()
 
 endif()
 
-target_link_libraries(${PROJECT_NAME} PRIVATE ${REQUIRED_QT_LIBS} SCodes)
-
+target_link_libraries(${PROJECT_NAME} PRIVATE SCodes)
 
 if(QT_VERSION_MAJOR EQUAL 6)
     qt_import_qml_plugins(${PROJECT_NAME})

examples/QmlBarcodeReader/CMakeLists.txt

@@ -10,17 +10,12 @@ set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-#Check this file for any *_DIR variable definitions and other
-include("cmake/Locations.cmake")
-
 if(Qt${QT_VERSION_MAJOR} STREQUAL Qt5)
     qt5_add_resources(RSCS Qt5qml.qrc)
 else()
     qt_add_resources(RSCS Qt6qml.qrc)
 endif()
 
-add_subdirectory(${LIB_DIR} ${CMAKE_BINARY_DIR}/SCodes)
-
 if(ANDROID)
 
     if(Qt${QT_VERSION_MAJOR} STREQUAL Qt5)
@@ -54,8 +49,7 @@ else()
 
 endif()
 
-target_link_libraries(${PROJECT_NAME} PRIVATE ${REQUIRED_QT_LIBS} SCodes)
-
+target_link_libraries(${PROJECT_NAME} PRIVATE SCodes)
 
 if(QT_VERSION_MAJOR EQUAL 6)
     qt_import_qml_plugins(${PROJECT_NAME})

src/SBarcodeGenerator.cpp

@@ -241,6 +241,11 @@ QColor SBarcodeGenerator::backgroundColor() const
     return m_backgroundColor;
 }
 
+QString SBarcodeGenerator::generatedFilePath() const
+{
+    return m_filePath;
+}
+
 void SBarcodeGenerator::setBackgroundColor(const QColor &backgroundColor)
 {
     if (m_backgroundColor == backgroundColor) {

src/SBarcodeGenerator.h

@@ -99,6 +99,12 @@ class SBarcodeGenerator : public QQuickItem
      */
     QColor backgroundColor() const;
 
+    /*!
+     * \brief Returns the full path to the last successfully generated barcode image (temp file).
+     * Exposed for unit tests only.
+     */
+    QString generatedFilePath() const;
+
 public slots:
 
     /*!

src/SBarcodeScanner.cpp

@@ -89,13 +89,13 @@ QCamera *SBarcodeScanner::makeDefaultCamera()
     auto defaultCamera = QMediaDevices::defaultVideoInput();
     if (defaultCamera.isNull())
     {
-        errorOccured("No default camera could be found on the system");
+        emit errorOccured("No default camera could be found on the system");
         return nullptr;
     }
 
     auto camera = new QCamera(defaultCamera, this);
     if (camera->error()) {
-        errorOccured("Error during camera initialization: " + camera->errorString());
+        emit errorOccured("Error during camera initialization: " + camera->errorString());
         return nullptr;
     }
 
@@ -109,7 +109,7 @@ QCamera *SBarcodeScanner::makeDefaultCamera()
     }
     if(supportedFormats.empty())
     {
-        errorOccured("A default camera was found but it has no supported formats. The Camera may be wrongly configured.");
+        emit errorOccured("A default camera was found but it has no supported formats. The Camera may be wrongly configured.");
         return nullptr;
     }
 

tests/CMakeLists.txt

@@ -0,0 +1,17 @@
+project(SCodes_tests LANGUAGES CXX)
+enable_testing()
+
+file(GLOB_RECURSE SOURCES *.cpp)
+add_executable(${PROJECT_NAME} ${SOURCES})
+
+target_include_directories(${PROJECT_NAME} PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/../3rdParty/googletest
+)
+
+target_link_libraries(${PROJECT_NAME} PRIVATE
+    SCodes
+    GTest::gtest
+    GTest::gtest_main
+    Qt6::Core
+    Qt6::Gui
+)

tests/main.cpp

@@ -0,0 +1,6 @@
+#include <gtest/gtest.h>
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}