refactor(server): mail service (#10934)

packages/backend/server/src/__tests__/mocks/index.ts

@@ -3,6 +3,7 @@ export * from './team-workspace.mock';
 export * from './user.mock';
 export * from './workspace.mock';
 
+import { MockMailer } from './mailer.mock';
 import { MockTeamWorkspace } from './team-workspace.mock';
 import { MockUser } from './user.mock';
 import { MockWorkspace } from './workspace.mock';
@@ -12,3 +13,5 @@ export const Mockers = {
   Workspace: MockWorkspace,
   TeamWorkspace: MockTeamWorkspace,
 };
+
+export { MockMailer };

packages/backend/server/src/__tests__/mocks/mailer.mock.ts

@@ -0,0 +1,29 @@
+import Sinon from 'sinon';
+
+import { Mailer } from '../../core/mail';
+import { MailName } from '../../mails';
+
+export class MockMailer {
+  send = Sinon.createStubInstance(Mailer).send.resolves(true);
+
+  last<Mail extends MailName>(
+    name: Mail
+  ): Extract<Jobs['notification.sendMail'], { name: Mail }> {
+    const last = this.send.lastCall.args[0];
+
+    if (!last) {
+      throw new Error('No mail ever sent');
+    }
+
+    if (last.name !== name) {
+      throw new Error(`Mail name mismatch: ${last.name} !== ${name}`);
+    }
+
+    return last as any;
+  }
+
+  count(name: MailName) {
+    return this.send.getCalls().filter(call => call.args[0].name === name)
+      .length;
+  }
+}