release: Multi-Hoster-Upload v2.0.3

tests/serialized-runner.test.js

@@ -0,0 +1,32 @@
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+
+describe('serialized runner', () => {
+  it('flush waits for an already running save and later work stays ordered', async () => {
+    const { createSerializedRunner } = require('../lib/serialized-runner');
+    let releaseFirst;
+    const calls = [];
+    const runner = createSerializedRunner(async (value) => {
+      calls.push(`start:${value}`);
+      if (value === 'first') await new Promise((resolve) => { releaseFirst = resolve; });
+      calls.push(`end:${value}`);
+      return value;
+    });
+
+    const first = runner.run('first');
+    await new Promise((resolve) => setImmediate(resolve));
+    const second = runner.run('second');
+    let flushed = false;
+    const flush = runner.flush().then(() => { flushed = true; });
+    await new Promise((resolve) => setImmediate(resolve));
+    assert.equal(flushed, false);
+    assert.deepEqual(calls, ['start:first']);
+
+    releaseFirst();
+    assert.equal(await first, 'first');
+    assert.equal(await second, 'second');
+    await flush;
+    assert.equal(flushed, true);
+    assert.deepEqual(calls, ['start:first', 'end:first', 'start:second', 'end:second']);
+  });
+});