code: func (ctx *AssertContext) AddConfig(config *config.GCSCli) {
  	ctx.Config = config
  	for _, opt := range ctx.options {
  		opt(ctx)
  	}
  	ctx.ConfigPath = MakeConfigFile(ctx.Config)
  }
docs: // AddConfig includes the config.GCSCli required for AssertContext
  //
  // Configuration is typically not available immediately before a test
  // can be run, hence the need to add it later.