code-server/test/unit/node/heart.test.ts

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import { logger } from "@coder/logger"
import { readFile, writeFile, stat, utimes } from "fs/promises"
import { Heart, heartbeatTimer } from "../../../src/node/heart"
import { clean, mockLogger, tmpdir } from "../../utils/helpers"
const mockIsActive = (resolveTo: boolean) => jest.fn().mockResolvedValue(resolveTo)
describe("Heart", () => {
const testName = "heartTests"
let testDir = ""
let heart: Heart
beforeAll(async () => {
mockLogger()
await clean(testName)
testDir = await tmpdir(testName)
})
beforeEach(() => {
heart = new Heart(`${testDir}/shutdown.txt`, mockIsActive(true))
})
afterAll(() => {
jest.restoreAllMocks()
})
afterEach(() => {
jest.resetAllMocks()
if (heart) {
heart.dispose()
}
})
it("should write to a file when given a valid file path", async () => {
// Set up heartbeat file with contents
const text = "test"
const pathToFile = `${testDir}/file.txt`
await writeFile(pathToFile, text)
const fileContents = await readFile(pathToFile, { encoding: "utf8" })
// Explicitly set the modified time to 0 so that we can check
// that the file was indeed modified after calling heart.beat().
// This works around any potential race conditions.
// Docs: https://nodejs.org/api/fs.html#fspromisesutimespath-atime-mtime
await utimes(pathToFile, 0, 0)
expect(fileContents).toBe(text)
heart = new Heart(pathToFile, mockIsActive(true))
heart.beat()
// HACK@jsjoeio - beat has some async logic but is not an async method
// Therefore, we have to create an artificial wait in order to make sure
// all async code has completed before asserting
await new Promise((r) => setTimeout(r, 100))
// Check that the heart wrote to the heartbeatFilePath and overwrote our text
const fileContentsAfterBeat = await readFile(pathToFile, { encoding: "utf8" })
expect(fileContentsAfterBeat).not.toBe(text)
// Make sure the modified timestamp was updated.
const fileStatusAfterEdit = await stat(pathToFile)
expect(fileStatusAfterEdit.mtimeMs).toBeGreaterThan(0)
})
it("should log a warning when given an invalid file path", async () => {
heart = new Heart(`fakeDir/fake.txt`, mockIsActive(false))
heart.beat()
// HACK@jsjoeio - beat has some async logic but is not an async method
// Therefore, we have to create an artificial wait in order to make sure
// all async code has completed before asserting
await new Promise((r) => setTimeout(r, 100))
expect(logger.warn).toHaveBeenCalled()
})
it("should be active after calling beat", () => {
heart.beat()
const isAlive = heart.alive()
expect(isAlive).toBe(true)
})
it("should not be active after dispose is called", () => {
heart.dispose()
const isAlive = heart.alive()
expect(isAlive).toBe(false)
})
})
describe("heartbeatTimer", () => {
beforeAll(() => {
mockLogger()
})
afterAll(() => {
jest.restoreAllMocks()
})
afterEach(() => {
jest.resetAllMocks()
})
it("should call beat when isActive resolves to true", async () => {
const isActive = true
const mockIsActive = jest.fn().mockResolvedValue(isActive)
const mockBeatFn = jest.fn()
await heartbeatTimer(mockIsActive, mockBeatFn)
expect(mockIsActive).toHaveBeenCalled()
expect(mockBeatFn).toHaveBeenCalled()
})
it("should log a warning when isActive rejects", async () => {
const errorMsg = "oh no"
const error = new Error(errorMsg)
const mockIsActive = jest.fn().mockRejectedValue(error)
const mockBeatFn = jest.fn()
await heartbeatTimer(mockIsActive, mockBeatFn)
expect(mockIsActive).toHaveBeenCalled()
expect(mockBeatFn).not.toHaveBeenCalled()
expect(logger.warn).toHaveBeenCalledWith(errorMsg)
})
})