add action queue unit test

src/action-queue.test.ts

@@ -0,0 +1,30 @@
+import { setTimeout } from "node:timers/promises"
+import { expect, test } from "vitest"
+import { ActionQueue } from "./action-queue.js"
+
+test("action queue", async () => {
+  const queue = new ActionQueue()
+  let results: string[] = []
+
+  queue.add({
+    id: "a",
+    priority: 1,
+    run: async () => {
+      await setTimeout(100)
+      results.push("a")
+    },
+  })
+
+  queue.add({
+    id: "b",
+    priority: 0,
+    run: async () => {
+      await setTimeout(50)
+      results.push("b")
+    },
+  })
+
+  expect(results).toEqual([])
+  await queue.done()
+  expect(results).toEqual(["b", "a"])
+})