Add error/empty cases for forums

[rbdr/forum] / jest.config.json

{
  "transform": {
    "^.+\\.js$": "babel-jest",
    "^.+\\.svelte$": "svelte-jester"
  },
  "moduleNameMapper": {
    "^\\$lib(.*)$": "<rootDir>/src/lib$1",
    "^\\$app(.*)$": [".svelte/dev/runtime/app/*", ".svelte/build/runtime/app/*"],
    "^\\$(.*)$": "<rootDir>/src$1"
  },
  "moduleFileExtensions": ["js", "svelte"]
}