dafit/__tests__/Resolver.js

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import { Resolver, SyncResolver } from '../src/Resolver';

describe('Resolver.js', () => {
  describe('Resolver', () => {
    it('Throw if no mapping provided', () => {
      expect(() => new Resolver()).toThrowError(
        'You must provide a mapping object'
      );
    });

    it('Returns a function', () => {
      const resolver = new Resolver({ id: null });
      expect(typeof resolver).toBe('function');
    });

    it('Returns a function returning a promise', () => {
      const resolver = new Resolver({ id: null });
      expect(resolver()).toBeInstanceOf(Promise);
    });
  });

  describe('SyncResolver', () => {
    it('Throw if no mapping provided', () => {
      expect(() => new SyncResolver()).toThrowError(
        'You must provide a mapping object'
      );
    });

    it('Returns a function', () => {
      const resolver = new SyncResolver({ id: null });
      expect(typeof resolver).toBe('function');
    });

    it('Returns a function returning a promise', () => {
      const resolver = new SyncResolver({ id: null });
      expect(resolver()).toBeInstanceOf(Object);
    });
  });
});