Building Slack integration

backend/tests/queue.test.ts

@@ -64,6 +64,40 @@ describe('queue', () => {
     expect(errors).toHaveBeenCalled();
   });
 
+  /**
+   * The whole point of classifying a failure as permanent: a revoked token or
+   * a deleted channel cannot be fixed by trying again, and retrying it holds
+   * up every job behind it.
+   */
+  it('should abandon a job immediately when the error is marked permanent', async () => {
+    configureQueue({ maxAttempts: 4 });
+    let attempts = 0;
+
+    enqueue('permanently-failing', async () => {
+      attempts += 1;
+      throw Object.assign(new Error('token_revoked'), { permanent: true });
+    });
+
+    await drain();
+
+    expect(attempts).toBe(1);
+    expect(String(errors.mock.calls[0]?.[0])).toContain('abandoned as permanent');
+  });
+
+  it('should still retry a job whose error carries a falsy permanent flag', async () => {
+    configureQueue({ maxAttempts: 3 });
+    let attempts = 0;
+
+    enqueue('transiently-failing', async () => {
+      attempts += 1;
+      throw Object.assign(new Error('ratelimited'), { permanent: false });
+    });
+
+    await drain();
+
+    expect(attempts).toBe(3);
+  });
+
   it('should retry a failing job up to the configured cap and then give up', async () => {
     configureQueue({ maxAttempts: 4 });
     let attempts = 0;