Disable unit tests on demand

A consumer of this library, might not need to build unit tests. Let the
consumer of this library a way for him to disable tests building.

CMakeLists.txt

@@ -3,12 +3,18 @@ project(QSimpleUpdater
     LANGUAGES CXX
 )
 
+option(QSIMPLE_UPDATER_BUILD_TESTS "Build the unit tests" ON)
+
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_AUTOMOC ON)
 
-find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets Network Test)
-find_package(Qt${QT_VERSION_MAJOR} CONFIG REQUIRED COMPONENTS Widgets Network Test)
+find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets Network)
+find_package(Qt${QT_VERSION_MAJOR} CONFIG REQUIRED COMPONENTS Widgets Network)
+
+if(QSIMPLE_UPDATER_BUILD_TESTS)
+    find_package(Qt${QT_VERSION_MAJOR} CONFIG REQUIRED COMPONENTS Test)
+endif()
 
 add_library(QSimpleUpdater STATIC
     etc/resources/qsimpleupdater.qrc
@@ -28,14 +34,15 @@ target_link_libraries(QSimpleUpdater PUBLIC Qt${QT_VERSION_MAJOR}::Core Qt${QT_V
 
 add_subdirectory(tutorial)
 
-
-enable_testing()
-add_executable(UnitTests
-    tests/main.cpp
-    tests/Test_Versioning.h
-    tests/Test_Updater.h
-    tests/Test_QSimpleUpdater.h
-    tests/Test_Downloader.h
-)
-add_test(NAME ApiTest COMMAND ApiTest)
-target_link_libraries(UnitTests PRIVATE Qt${QT_VERSION_MAJOR}::Test QSimpleUpdater)
+if(QSIMPLE_UPDATER_BUILD_TESTS)
+    enable_testing()
+    add_executable(UnitTests
+        tests/main.cpp
+        tests/Test_Versioning.h
+        tests/Test_Updater.h
+        tests/Test_QSimpleUpdater.h
+        tests/Test_Downloader.h
+    )
+    add_test(NAME ApiTest COMMAND ApiTest)
+    target_link_libraries(UnitTests PRIVATE Qt${QT_VERSION_MAJOR}::Test QSimpleUpdater)
+endif()