Template() (*param.Template, error)

	// TemplateOrFail calls Template and fails if an error occurs.
	TemplateOrFail(t test.Failer) *param.Template

	// MustTemplate calls Template and panics if an error occurs.
	MustTemplate() *param.Template

	// YAML reads the yaml from this Source. If this source contains parameters,
	// it is evaluated as a template.
	YAML() (string, error)