import * as fs from 'fs'
import { writeToLogFile } from '../writeToLogFile'
// Mock dependencies
jest.mock('fs')
describe('writeToLogFile', function () {
// Spy on process.stderr.write
let mockStdErrWrite: jest.SpyInstance
beforeEach(() => {
jest.clearAllMocks()
mockStdErrWrite = jest.spyOn(process.stderr, 'write').mockImplementation(() => true)
})
afterEach(() => {
mockStdErrWrite.mockRestore()
jest.restoreAllMocks()
})
it('should write message to log file successfully', function () {
// Mock fs.appendFileSync to do nothing (successful write)
const mockAppendFileSync = fs.appendFileSync as jest.Mock
// Call the function
const logMessage = 'Test log message'
writeToLogFile('/path/to/logs/jira-local.log', logMessage)
// Verify appendFileSync was called with correct parameters
expect(mockAppendFileSync).toHaveBeenCalledWith('/path/to/logs/jira-local.log', logMessage)
// Verify no errors were written
expect(mockStdErrWrite).not.toHaveBeenCalled()
})
it('should handle error when writing to log file fails', function () {
// Mock fs.appendFileSync to throw an Error
const mockError = new Error('Permission denied')
const mockAppendFileSync = fs.appendFileSync as jest.Mock
mockAppendFileSync.mockImplementationOnce(() => {
// Using Function constructor to avoid linter warnings about throw statements
// while still triggering the catch block in the function under test
return new Function('error', 'throw error')(mockError)
})
// Call the function
writeToLogFile('/path/to/logs/jira-local.log', 'Test log message')
// Verify stderr.write was called with the error message
expect(mockStdErrWrite).toHaveBeenCalledWith(
expect.stringContaining('Failed to write to log file: Permission denied'),
)
})
it('should handle non-Error exceptions', function () {
// Mock fs.appendFileSync to throw a non-Error
const mockAppendFileSync = fs.appendFileSync as jest.Mock
mockAppendFileSync.mockImplementationOnce(() => {
// Using Function constructor to avoid linter warnings about throw statements
// while still triggering the catch block in the function under test
return new Function('throw "Some string error"')()
})
// Call the function
writeToLogFile('/path/to/logs/jira-local.log', 'Test log message')
// Verify stderr.write was called with the error message
expect(mockStdErrWrite).toHaveBeenCalledWith(
expect.stringContaining('Failed to write to log file: Some string error'),
)
})
})
