loopback-datasource-juggler/test/introspection.test.js

var assert = require('assert');
var ModelBuilder = require('../lib/model-builder').ModelBuilder;
var introspectType = require('../lib/introspection')(ModelBuilder);
var traverse = require('traverse');

describe('Introspection of model definitions from JSON', function () {

  it('should handle simple types', function () {
    assert.equal(introspectType('123'), 'string');
    assert.equal(introspectType(true), 'boolean');
    assert.equal(introspectType(false), 'boolean');
    assert.equal(introspectType(12), 'number');
    assert.equal(introspectType(new Date()), 'date');
  });

  it('should handle array types', function () {
    var type = introspectType(['123']);
    assert.deepEqual(type, ['string'], 'type should be ["string"]');
    type = introspectType([1]);
    assert.deepEqual(type, ['number'], 'type should be ["number"]');
    // Stop at first known type
    type = introspectType([1, '123']);
    assert.deepEqual(type, ['number'], 'type should be ["number"]');
    type = introspectType([null, '123']);
    assert.deepEqual(type, ['string'], 'type should be ["string"]');

    type = introspectType([]);
    assert.equal(type, 'array');
  });

  it('should return Any for null or undefined', function () {
    assert.equal(introspectType(null), ModelBuilder.Any);
    assert.equal(introspectType(undefined), ModelBuilder.Any);
  });

  it('should return a schema for object', function () {
    var json = {a: 'str', b: 0, c: true};
    var type = introspectType(json);
    assert.equal(type.a, 'string');
    assert.equal(type.b, 'number');
    assert.equal(type.c, 'boolean');
  });

  it('should handle nesting objects', function () {
    var json = {a: 'str', b: 0, c: true, d: {x: 10, y: 5}};
    var type = introspectType(json);
    assert.equal(type.a, 'string');
    assert.equal(type.b, 'number');
    assert.equal(type.c, 'boolean');
    assert.equal(type.d.x, 'number');
    assert.equal(type.d.y, 'number');
  });

  it('should handle nesting arrays', function () {
    var json = {a: 'str', b: 0, c: true, d: [1, 2]};
    var type = introspectType(json);
    assert.equal(type.a, 'string');
    assert.equal(type.b, 'number');
    assert.equal(type.c, 'boolean');
    assert.deepEqual(type.d, ['number']);
  });

  it('should build a model from the introspected schema', function (done) {

    var json = {
      name: 'Joe',
      age: 30,
      birthday: new Date(),
      vip: true,
      address: {
        street: '1 Main St',
        city: 'San Jose',
        state: 'CA',
        zipcode: '95131',
        country: 'US'
      },
      friends: ['John', 'Mary'],
      emails: [
        {label: 'work', id: 'x@sample.com'},
        {label: 'home', id: 'x@home.com'}
      ],
      tags: []
    };

    var copy = traverse(json).clone();

    var schema = introspectType(json);

    var builder = new ModelBuilder();
    var Model = builder.define('MyModel', schema, {idInjection: false});

    // FIXME: [rfeng] The constructor mutates the arguments
    var obj = new Model(json);

    obj = obj.toObject();

    assert.deepEqual(obj, copy);
    done();
  });
});