What is the test for a parent to have a right to visitation?

The right to parent can only give way upon a clear and convincing showing of parental unfitness and detriment to the child. However, we are not here concerned with an award of custody but simply a temporary right of visitation. The right of visitation while not being equivalent of full custody is a limited form of custody during the time the right is being exercised. (See Perry v. Superior Court, supra, 108 Cal.App.3d at p. 483, 166 Cal.Rptr. 583.) Against this conceded intrusion on the right to parent must be measured the section 4601 grant of right of reasonable visitation where the interests and the welfare of the child are to be benefited.