Nyoho · December 25, 2021 11:12 · Dec 25, 2021
diff --git a/npm-script.test.js b/npm-script.test.js
@@ -0,0 +1,38 @@
+const util = require('util');
+const exec = util.promisify(require('child_process').exec);
+const fetch = require('undici').fetch;
+const promiseRetry = require('promise-retry');
+
+const sleep = (time) => {
+  return new Promise((resolve, reject) => {
+      setTimeout(() => {
+          resolve()
+      }, time)
+  })
+}
+
+describe('npm scripts', () => {
+  it.concurrent('starts a dev server', async () => {
+    const ac = new AbortController();
+    const devServerPromise = exec('npm run dev', { signal: ac.signal });
+    const result = await promiseRetry(async (retry, number) => {
+      if (number > 1) {
+        console.log(`Retrying fetch...(${number})`);
+      }
+      try {
+        console.log(`Let's try (${number}th time)`);
+        return await fetch('http://localhost:3000/')
+      } catch (e) {
+        await sleep(1000);
+        await retry(e);
+      }
+    }, { retries: 10 });
+    console.log('After promiseRetry()');
+    try {
+      ac.abort();
+    } catch (e) {
+      console.log("abort 例外を無視 ", e);
+    }
+    expect(result.status).toBe(200);
+  });
+});