loopback-jest

Repository of jest matchers for loopback

External Dependencies

This plugin expects that you have jest and loopback packages available to import.

Usage with Jest

Install Jest Plugins

yarn add --dev jest-plugins loopback-jest

Find your jest config which is either in your package.json or in a top-level file called jest.config.js. Add a key setupTestFrameworkScriptFile and point it to another file at the top-level called jest-plugins.js.

require('jest-plugins')(['loopback-jest']);

Added Matchers

.toBeModel()

Expect that a model instance is actually a loopback Model. It uses instanceof loopback.Model internally.

Example:

  const model = new loopback.Model();
  expect(model).toBeModel();

.toHaveRelationship(name, model)

Expect that the model class has a relationship called name, with a model called model.

Example:

  const Soccer = loopback.createModel({
    name: 'Soccer',
    relations: {
      balls: {
        type: 'hasMany',
        model: 'Ball'
      },
    },
  });
  expect(Soccer).toHaveRelationship('balls', 'Ball');

.toHavePropertyOfType(name, type)

Expect that the model class has a property with name and type.

Example:

  const Soccer = loopback.createModel({
    name: 'Soccer',
    properties: {id: 'number'}
  });
  expect(Soccer).toHavePropertyOfType('id', Number);

.toBelongsTo(model, relationship, [foreignKey])

Expect that the model class belongs to an model with named relationship, optionally with foreignKey.

Example:

  const Soccer = loopback.createModel({
    name: 'Soccer',
    relations: {
      stadium: {
        type: 'belongsTo',
        model: 'Stadium',
        foreignKey: 'stadiumId',
      },
    },
  });
  expect(Soccer).toBelongsTo('Stadium', 'stadium', 'stadiumId');

.toHaveOne(model, relationship, [foreignKey])

Expect that the model class has one model with named relationship, and optionally with foreignKey.

Example:

  const Soccer = loopback.createModel({
    name: 'Soccer',
    relations: {
      winner: {
        type: 'hasOne',
        model: 'Winner',
        foreignKey: 'winnerId',
      },
    },
  });
  expect(Soccer).toHaveOne('Winner', 'winner', 'winnerId');

.toHaveMany(model, relationship, [foreignKey])

Expect that the model class have many models with named relationship, and optionally with foreignKey.

Example:

  const Soccer = loopback.createModel({
    name: 'Soccer',
    relations: {
      players: {
        type: 'hasMany',
        model: 'Player',
        foreignKey: 'soccerId',
      },
    },
  });
  expect(Soccer).toHaveMany('Player', 'players', 'soccerId');

.toInherits(BaseModel)

Expect that the Model class inherits BaseModel.

Example:

  const Game = loopback.createModel({
    name: 'Game',
  });
  const Soccer = loopback.createModel({
    name: 'Soccer',
    base: Game,
  });
  expect(Soccer).toInherits(Game);