test(locale): test that languages are properly defined (#4220)

Author: ReenigneArcher

.github/copilot-instructions.md

@@ -3,6 +3,9 @@ You need to prefix commands with `C:\msys64\msys2_shell.cmd -defterm -here -no-s
 
 Prefix build directories with `cmake-build-`.
 
-The test executable is named `test_sunshine`
+The test executable is named `test_sunshine` and will be located inside the `tests` directory within
+the build directory.
+
+The project uses gtest as a test framework.
 
 Always follow the style guidelines defined in .clang-format for c/c++ code.

tests/CMakeLists.txt

@@ -60,6 +60,7 @@ set(CONFIG_TEST_FILES
     "src_assets/common/assets/web/config.html"
     "docs/configuration.md"
     "src_assets/common/assets/web/public/assets/locale/en.json"
+    "src_assets/common/assets/web/configs/tabs/General.vue"
 )
 
 foreach(file ${CONFIG_TEST_FILES})
@@ -70,10 +71,25 @@ foreach(file ${CONFIG_TEST_FILES})
     )
 endforeach()
 
+# Copy all locale files for locale consistency tests
+# Use a custom command to properly handle both adding and removing files
+set(LOCALE_SRC_DIR "${CMAKE_SOURCE_DIR}/src_assets/common/assets/web/public/assets/locale")
+set(LOCALE_DST_DIR "${CMAKE_CURRENT_BINARY_DIR}/src_assets/common/assets/web/public/assets/locale")
+add_custom_target(sync_locale_files ALL
+    COMMAND ${CMAKE_COMMAND} -E rm -rf "${LOCALE_DST_DIR}"
+    COMMAND ${CMAKE_COMMAND} -E make_directory "${LOCALE_DST_DIR}"
+    COMMAND ${CMAKE_COMMAND} -E copy_directory "${LOCALE_SRC_DIR}" "${LOCALE_DST_DIR}"
+    COMMENT "Synchronizing locale files for tests"
+    VERBATIM
+)
+
 foreach(dep ${SUNSHINE_TARGET_DEPENDENCIES})
     add_dependencies(${PROJECT_NAME} ${dep})  # compile these before sunshine
 endforeach()
 
+# Ensure locale files are synchronized before building the test executable
+add_dependencies(${PROJECT_NAME} sync_locale_files)
+
 set_target_properties(${PROJECT_NAME} PROPERTIES CXX_STANDARD 23)
 target_link_libraries(${PROJECT_NAME}
         ${SUNSHINE_EXTERNAL_LIBRARIES}