keyData missing database number

[NeilASega]

When constructing the keyData string in the ctor you should include the database number - at the moment the db number does not affect the context where the data is stored meaning redis queries return the wrong data.

class RedisMock extends EventEmitter {
  constructor(...args) {
    super()

   ... code removed for brevity

    const optionsWithDefault = { ...defaultOptions, ...getOptions(...args) }

    this.keyData = `${optionsWithDefault.host}:${optionsWithDefault.port}/optionsWithDefault.db` <-- include db here