Missing test coverage

[OhioDschungel6]

The test coverage of the language server is not working with the current setup if the language server is also implemented in python. The problem seems to be, that client.shutdown_session() is not waiting for the async subprocess to finish gracefully.

The following workaround seems to work.

@pytest_lsp.fixture(  # type: ignore[misc]
    config=ClientServerConfig(
        server_command=[sys.executable, "..."],
    )
)
async def client(lsp_client: LanguageClient):  # type: ignore[no-untyped-def]
    # Setup
    await lsp_client.initialize_session(
        InitializeParams(
            capabilities=client_capabilities("visual-studio-code"),
        )
    )

    yield lsp_client

    # Teardown
    await lsp_client.shutdown_session()
    # Needed, otherwise the coverage of the server process is not collected.
    server_process = lsp_client._server
    if server_process:
        await server_process.wait()