lincd/lib/esm/tests/shapevaluesset.test.js

LINCD is a JavaScript library for building user interfaces with linked data (also known as 'structured data', or RDF)

import { describe, expect, test } from '@jest/globals';
import { NamedNode } from '../models.js';
import { Shape } from '../shapes/Shape.js';
class Person extends Shape {
    get knows() {
        return this.getAllAs(knows, Person);
    }
}
let personNode1 = NamedNode.create();
let personNode2 = NamedNode.create();
let personNode3 = NamedNode.create();
let person1 = new Person(personNode1);
let person2 = new Person(personNode2);
let person3 = new Person(personNode3);
let knows = NamedNode.create();
personNode1.set(knows, personNode2);
describe('shape value set', () => {
    test('reflects current amount of properties', () => {
        expect(person1.knows.size).toBe(1);
    });
    test('matches shapes of the same node', () => {
        //ShapeValueSets make their own instances of shapes which may not be the same instance
        // as another instance of the same shape for the same node
        //in this case, person2 will not exist in the set by true identity, but an equivalent shape DOES exist in the set
        //so this should return true. See ShapeSet.has tests and implementation
        expect(person1.knows.has(person2)).toBe(true);
    });
    test('adds nodes to the graph when you add a new shape to them', () => {
        //first we add and get the size of THAT set
        expect(person1.knows.add(person3).size).toBe(2);
        //then we get the set again (will be a new one with new shapes) and check the size
        expect(person1.knows.size).toBe(2);
        //then we check the actual graph
        expect(personNode1.getAll(knows).size).toBe(2);
        //the same instance can be expected to be there if you directly added it
        expect(person1.knows.has(person3)).toBe(true);
    });
    test('remove nodes to the graph when you delete a shape from them', () => {
        person1.knows.delete(person3);
        expect(person1.knows.size).toBe(1);
        expect(personNode1.getAll(knows).size).toBe(1);
        //should not occur in the set anymore
        expect(person1.knows.has(person3)).toBe(false);
    });
});
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