Fallback name branch (#6591)

spec/controllers/microsoft/callbacks_controller_spec.rb

@@ -15,6 +15,11 @@ RSpec.describe 'Microsoft::CallbacksController', type: :request do
         refresh_token: SecureRandom.hex(10) }
     end
 
+    let(:response_body_success_without_name) do
+      { id_token: JWT.encode({ email: email }, false), access_token: SecureRandom.hex(10), token_type: 'Bearer',
+        refresh_token: SecureRandom.hex(10) }
+    end
+
     it 'creates inboxes if authentication is successful' do
       stub_request(:post, 'https://login.microsoftonline.com/common/oauth2/v2.0/token')
         .with(body: { 'code' => code, 'grant_type' => 'authorization_code',
@@ -52,6 +57,20 @@ RSpec.describe 'Microsoft::CallbacksController', type: :request do
       expect(Redis::Alfred.get(email)).to be_nil
     end
 
+    it 'creates inboxes with fallback_name when account name is not present in id_token' do
+      stub_request(:post, 'https://login.microsoftonline.com/common/oauth2/v2.0/token')
+        .with(body: { 'code' => code, 'grant_type' => 'authorization_code',
+                      'redirect_uri' => "#{ENV.fetch('FRONTEND_URL', 'http://localhost:3000')}/microsoft/callback" })
+        .to_return(status: 200, body: response_body_success_without_name.to_json, headers: { 'Content-Type' => 'application/json' })
+
+      get microsoft_callback_url, params: { code: code }
+
+      expect(response).to redirect_to app_microsoft_inbox_agents_url(account_id: account.id, inbox_id: account.inboxes.last.id)
+      expect(account.inboxes.count).to be 1
+      inbox = account.inboxes.last
+      expect(inbox.name).to eq email.split('@').first.parameterize.titleize
+    end
+
     it 'redirects to microsoft app in case of error' do
       stub_request(:post, 'https://login.microsoftonline.com/common/oauth2/v2.0/token')
         .with(body: { 'code' => code, 'grant_type' => 'authorization_code',