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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"])
})
})
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