feat(snjs): add sign in with recovery codes use case (#2130)

* feat(snjs): add sign in with recovery codes use case

* fix(snjs): code review adjustments

* fix(snjs): remove unnecessary exposed getter

* fix(services): waiting for event handling

* fix: preferences test

Co-authored-by: Mo <mo@standardnotes.com>

packages/snjs/mocha/lib/AppContext.js

@@ -220,6 +220,16 @@ export class AppContext {
     })
   }
 
+  awaitUserPrefsSingletonResolution() {
+    return new Promise((resolve) => {
+      this.application.preferencesService.addEventObserver((eventName) => {
+        if (eventName === PreferencesServiceEvent.PreferencesChanged) {
+          resolve()
+        }
+      })
+    })
+  }
+
   async launch({ awaitDatabaseLoad = true, receiveChallenge } = { awaitDatabaseLoad: true }) {
     await this.application.prepareForLaunch({
       receiveChallenge: receiveChallenge || this.handleChallenge,

packages/snjs/mocha/preferences.test.js

@@ -74,10 +74,16 @@ describe('preferences', function () {
     await register.call(this)
     await this.application.setPreference('editorLeft', 300)
     await this.application.sync.sync()
-    this.application = await Factory.signOutApplicationAndReturnNew(this.application)
+
+    this.application = await this.context.signout()
+
     await this.application.setPreference('editorLeft', 200)
     await this.application.signIn(this.email, this.password)
+
+    const promise = this.context.awaitUserPrefsSingletonResolution()
     await this.application.sync.sync({ awaitAll: true })
+    await promise
+
     const editorLeft = this.application.getPreference('editorLeft')
     expect(editorLeft).to.equal(300)
   })