Reproduction of the following error:
TypeError: append_styles is not a function
at Object.init (node_modules/svelte/internal/index.js:1791:22)
at new Router (node_modules/svelte-navigator/dist/svelte-navigator.umd.js:1243:16)
at create_fragment (src/testHelp/WrapRouter.svelte:335:11)
at init (node_modules/svelte/internal/index.js:1809:37)
at new WrapRouter (src/testHelp/WrapRouter.svelte:452:3)
at render (node_modules/@testing-library/svelte/dist/pure.js:81:21)
at renderWithRouter (src/testHelp/renderWithRouter.ts:22:9)
at Object.<anonymous> (src/components/Layout.test.ts:5:19)
at TestScheduler.scheduleTests (node_modules/@jest/core/build/TestScheduler.js:333:13)
at runJest (node_modules/@jest/core/build/runJest.js:387:19)
at _run10000 (node_modules/@jest/core/build/cli/index.js:408:7)
at runCLI (node_modules/@jest/core/build/cli/index.js:261:3)
When running jest and using svelte-navigator's renderWithRouter this error occurs.