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import parents from 'unist-util-parents'

describe('unist-util-parents feature for node with 2 or more parents', () => {
    it('Return all parents of a node instance in multiple parentNode.children', () => {

        const predicateTree = { type : 'predicateTree', children:[]}
        const parent1 = { type: 'predicate', children:[], id:'http://p/1'}
        const parent2 = { type: 'predicate', children:[], id:'http://p/2'}

        const objectOneParent  = { type: 'object', id:'http://o/1', value:'I only have one parent'}
        const objectTwoParents = { type: 'object', id:'http://o/2', value:'I have 2 parents !'}

        //build the tree
        parent1.children.push(objectTwoParents)
        parent2.children.push(objectTwoParents, objectOneParent)
        predicateTree.children.push(parent1, parent2)

        // wrap it
        const treeWithParents = parents(predicateTree)
        
        // w = wrapped
        const [wparent1, wparent2] = treeWithParents.children

        expect(wparent1.children.length).toBe(1)

        // objectTwoParents is under his 2 parents
        expect(wparent1.children[0]).toStrictEqual(objectTwoParents)
        expect(wparent2.children[0]).toStrictEqual(objectTwoParents)

        // get the wrapped object wO2P = object with 2 parents
        const [wO2P] = wparent2.children

        // but the parent relationship only return one parent
        console.log(wO2P.parent)
        expect(Array.isArray(wO2P.parent)).toBe(true)
    })
})