♻️ refactor(cli): validate startup arguments

lsp-server/test/CMakeLists.txt

@@ -28,6 +28,10 @@ if(EXISTS ${CMAKE_CURRENT_LIST_DIR}/test_scheduler/CMakeLists.txt)
   add_subdirectory(test_scheduler)
 endif()
 
+if(EXISTS ${CMAKE_CURRENT_LIST_DIR}/test_args_parser/CMakeLists.txt)
+  add_subdirectory(test_args_parser)
+endif()
+
 if(EXISTS ${CMAKE_CURRENT_LIST_DIR}/test_semantic/CMakeLists.txt)
   add_subdirectory(test_semantic)
 endif()
@@ -48,6 +52,10 @@ if(BUILD_TESTS)
       COMMAND ${PYTHON3_EXECUTABLE}
         ${CMAKE_CURRENT_LIST_DIR}/run_lsp_json_tests.py
         --server $<TARGET_FILE:tsl-server>)
+    add_test(NAME test_cli_startup
+      COMMAND ${PYTHON3_EXECUTABLE}
+        ${CMAKE_CURRENT_LIST_DIR}/test_cli_startup.py
+        --server $<TARGET_FILE:tsl-server>)
   else()
     message(WARNING "python3 not found; skipping test_lsp_json registration")
   endif()