Created missing tests for settings components

src/settings/RealTimeUpdates.tsx

@@ -34,7 +34,7 @@ const RealTimeUpdates = (
         placeholder="Immediate"
         disabled={!realTimeUpdates.enabled}
         value={intervalValue(realTimeUpdates.interval)}
-        onChange={(e) => setRealTimeUpdatesInterval(Number(e.target.value))}
+        onChange={({ target }) => setRealTimeUpdatesInterval(Number(target.value))}
       />
       {realTimeUpdates.enabled && (
         <small className="form-text text-muted">

src/settings/reducers/settings.ts

@@ -12,7 +12,7 @@ export const SET_SETTINGS = 'shlink/realTimeUpdates/SET_SETTINGS';
  * optional, as old instances of the app will load partial objects from local storage until it is saved again.
  */
 
-interface RealTimeUpdatesSettings {
+export interface RealTimeUpdatesSettings {
   enabled: boolean;
   interval?: number;
 }