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import { describe, expect, test } from "bun:test"
import { terminalWriter } from "./terminal-writer"
describe("terminalWriter", () => {
test("buffers and flushes once per schedule", () => {
const calls: string[] = []
const scheduled: VoidFunction[] = []
const writer = terminalWriter(
(data, done) => {
calls.push(data)
done?.()
},
(flush) => scheduled.push(flush),
)
writer.push("a")
writer.push("b")
writer.push("c")
expect(calls).toEqual([])
expect(scheduled).toHaveLength(1)
scheduled[0]?.()
expect(calls).toEqual(["abc"])
})
test("flush is a no-op when empty", () => {
const calls: string[] = []
const writer = terminalWriter(
(data, done) => {
calls.push(data)
done?.()
},
(flush) => flush(),
)
writer.flush()
expect(calls).toEqual([])
})
test("flush waits for pending write completion", () => {
const calls: string[] = []
let done: VoidFunction | undefined
const writer = terminalWriter(
(data, finish) => {
calls.push(data)
done = finish
},
(flush) => flush(),
)
writer.push("a")
let settled = false
writer.flush(() => {
settled = true
})
expect(calls).toEqual(["a"])
expect(settled).toBe(false)
done?.()
expect(settled).toBe(true)
})
})
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