graph-ecs/tests/query-parser/query.test.js

import { describe, it } from 'node:test'
import assert from '../assert.js'
import { query } from '../../src/query-parser/index.js'
import { Alias, Identifier, ObjectPath, Query, ReturnValues, SelectedGraph } from '../../src/query-parser/types.js'
import { makeNode, makeRelationship, makeRightEdge } from '../utils.js'

const path = (...v) => new ObjectPath(...v)
const alias = (...v) => new Alias(...v)
const identifier = n => new Identifier(n)
const graph = n => new SelectedGraph(identifier(n))
const returnVals = (...v) => new ReturnValues(...v)
const q = (u, m, rv) => new Query(u, m, rv)

describe('query', () => {
    it('should match a node', () => {
        assert.parseOk(query, 'MATCH (node:Label) RETURN node', ([actual]) => {
            const expected = q(
                undefined, // no use clause
                makeNode('node', 'Label'),
                returnVals(identifier('node'))
            )

            assert.deepEqual(actual, expected)
        })
    })

    it('should match a relationship', () => {
        assert.parseOk(query, 'MATCH (rown:Creature)-[:Petpats]->(kbity:NetCat) RETURN rown, kbity', ([actual]) => {
            const expected = q(
                undefined, // no use clause
                makeRelationship(
                    makeNode('rown', 'Creature'),
                    makeRightEdge(undefined, 'Petpats'),
                    makeNode('kbity', 'NetCat'),
                ),
                returnVals(identifier('rown'), identifier('kbity'))
            )

            assert.deepEqual(actual, expected)
        })
    })

    it('should support the USE clause', () => {
        assert.parseOk(query, 'USE aminals MATCH (kbity:Cat) RETURN kbity', ([actual]) => {
            const expected = q(
                graph('aminals'),
                makeNode('kbity', 'Cat'),
                returnVals(identifier('kbity'))
            )

            assert.deepEqual(actual, expected)
        })
    })

    it('should support complex queries', () => {
        assert.parseOk(query, 'USE aminals MATCH (kbity:Cat { type: "cute" })-[:Eats  { schedule: "daily" }]->(snacc:Feesh { type: "vegan", weight: 0.7 }) RETURN kbity.name AS name, snacc AS food', ([actual]) => {
            const expected = q(
                graph('aminals'),
                makeRelationship(
                    makeNode('kbity', 'Cat', [['type', 'cute']]),
                    makeRightEdge(undefined, 'Eats', [['schedule', 'daily']]),
                    makeNode('snacc', 'Feesh', [['type', 'vegan'], ['weight', 0.7]])
                ),
                returnVals(
                    alias(path(identifier('kbity'), identifier('name')), identifier('name')),
                    alias(identifier('snacc'), identifier('food'))
                )
            )

            assert.deepEqual(actual, expected)
        })
    })
})