chore: refactoring and tests (#12468)

packages/app/src/utils/scoped-cache.test.ts

@@ -0,0 +1,69 @@
+import { describe, expect, test } from "bun:test"
+import { createScopedCache } from "./scoped-cache"
+
+describe("createScopedCache", () => {
+  test("evicts least-recently-used entry when max is reached", () => {
+    const disposed: string[] = []
+    const cache = createScopedCache((key) => ({ key }), {
+      maxEntries: 2,
+      dispose: (value) => disposed.push(value.key),
+    })
+
+    const a = cache.get("a")
+    const b = cache.get("b")
+    expect(a.key).toBe("a")
+    expect(b.key).toBe("b")
+
+    cache.get("a")
+    const c = cache.get("c")
+
+    expect(c.key).toBe("c")
+    expect(cache.peek("a")?.key).toBe("a")
+    expect(cache.peek("b")).toBeUndefined()
+    expect(cache.peek("c")?.key).toBe("c")
+    expect(disposed).toEqual(["b"])
+  })
+
+  test("disposes entries on delete and clear", () => {
+    const disposed: string[] = []
+    const cache = createScopedCache((key) => ({ key }), {
+      dispose: (value) => disposed.push(value.key),
+    })
+
+    cache.get("a")
+    cache.get("b")
+
+    const removed = cache.delete("a")
+    expect(removed?.key).toBe("a")
+    expect(cache.peek("a")).toBeUndefined()
+
+    cache.clear()
+    expect(cache.peek("b")).toBeUndefined()
+    expect(disposed).toEqual(["a", "b"])
+  })
+
+  test("expires stale entries with ttl and recreates on get", () => {
+    let clock = 0
+    let count = 0
+    const disposed: string[] = []
+    const cache = createScopedCache((key) => ({ key, count: ++count }), {
+      ttlMs: 10,
+      now: () => clock,
+      dispose: (value) => disposed.push(`${value.key}:${value.count}`),
+    })
+
+    const first = cache.get("a")
+    expect(first.count).toBe(1)
+
+    clock = 9
+    expect(cache.peek("a")?.count).toBe(1)
+
+    clock = 11
+    expect(cache.peek("a")).toBeUndefined()
+    expect(disposed).toEqual(["a:1"])
+
+    const second = cache.get("a")
+    expect(second.count).toBe(2)
+    expect(disposed).toEqual(["a:1"])
+  })
+})