Speed up e2e test

e2e/e2e.spec.ts

@@ -35,6 +35,9 @@ import { FakeSecrets } from "./stubs/fake-secrets";
 
 jest.setTimeout(30000);
 
+// Speed up e2e tests by retrying failed requests with 100ms delay factor.
+process.env.BACKOFF_DELAY_FACTOR = "100";
+
 describe("e2e tests", () => {
   let cloudFunctions: CloudFunctions;
   let fakeGitHub: FakeGitHub;

src/domain/release-archive.spec.ts

@@ -78,8 +78,11 @@ describe("fetch", () => {
       retries: 3,
       retryDelay: expect.matchesPredicate((retryDelayFn: Function) => {
         // Make sure the retry delays follow exponential backoff
-        // and the final retry happens after at least 1 minute total.
-        // Axios also randomly adds up to 20% to each delay, so test the upper bounds as well.
+        // and the final retry happens after at least 1 minute total
+        // (in this case, at least 70 seconds).
+        // Axios randomly adds an extra 0-20% of jitter to each delay.
+        // Test upper bounds as well to ensure the workflow completes reasonably quickly
+        // (in this case, no more than 84 seconds total).
         let firstRetryDelay = retryDelayFn.call(this, 0);
         let secondRetryDelay = retryDelayFn.call(this, 1);
         let thirdRetryDelay = retryDelayFn.call(this, 2);

src/domain/release-archive.ts

@@ -108,12 +108,13 @@ export class ReleaseArchive {
   }
 }
 
-function tenSecondExponentialDelay(
+function exponentialDelay(
   retryCount: number,
   error: AxiosError | undefined
 ): number {
-  const tenSeconds = 10000;
-  return axiosRetry.exponentialDelay(retryCount, error, tenSeconds);
+  // Default delay factor is 10 seconds, but can be overridden for testing.
+  const delayFactor = Number(process.env.BACKOFF_DELAY_FACTOR) || 10_000;
+  return axiosRetry.exponentialDelay(retryCount, error, delayFactor);
 }
 
 async function download(url: string, dest: string): Promise<void> {
@@ -137,7 +138,7 @@ async function download(url: string, dest: string): Promise<void> {
   // gives you at least 70 seconds to upload a release archive.
   axiosRetry(axios, {
     retries: 3,
-    retryDelay: tenSecondExponentialDelay,
+    retryDelay: exponentialDelay,
     shouldResetTimeout: true,
   });