How to use

YAMLException

function

in

js-yaml

function tryYAMLParse(contents, defaultValue) {
 try {
  return yaml.safeLoad(contents) || defaultValue;
 } catch (err) {
  if (err instanceof yaml.YAMLException) {
   return defaultValue;
  }
  throw err;
 }
}

static instanceWithContext (context) {
  return Configuration.fetchConfigFile(context).then(config => {
   return new Configuration(config)
  }).catch(error => {
   let config = new Configuration()
   if (error instanceof ConfigFileNotFoundException) {
    config.errors.set(ERROR_CODES.NO_YML, `No Config File found`)
   } else if (error instanceof yaml.YAMLException) {
    config.errors.set(ERROR_CODES.BAD_YML, `Invalid YML format > ${error.message}`)
   } else {
    const errorMsg = `Github API Error occurred while fetching the config file at ${Configuration.FILE_NAME} \n Error from api: ${error}`
    config.errors.set(ERROR_CODES.GITHUB_API_ERROR, errorMsg)
   }
   return config
  })
 }

const context = createMockGhConfig()
context.probotContext.config = jest.fn().mockImplementation(() => {
 throw new yaml.YAMLException('Bad YML')
})