test: add snapshot tests for MessageBuilder (#5598)

src/CMakeLists.txt

@@ -497,6 +497,8 @@ set(SOURCE_FILES
         util/InitUpdateButton.hpp
         util/IpcQueue.cpp
         util/IpcQueue.hpp
+        util/IrcHelpers.cpp
+        util/IrcHelpers.hpp
         util/LayoutHelper.cpp
         util/LayoutHelper.hpp
         util/LoadPixmap.cpp
@@ -969,6 +971,7 @@ target_compile_definitions(${LIBRARY_PROJECT} PUBLIC
     IRC_STATIC
     IRC_NAMESPACE=Communi
     $<$<BOOL:${WIN32}>:_WIN32_WINNT=0x0A00> # Windows 10
+    $<$<BOOL:${BUILD_TESTS}>:CHATTERINO_WITH_TESTS>
     )
 
 if (USE_SYSTEM_QTKEYCHAIN)