import {expect} from 'chai';
import Middleware from '../src/middleware';

describe('middleware', () => {
  it('should construct with middleware', (done) => {
    let called = false;
    const middleware = new Middleware([
      (next) => {
        called = true;
        next();
      },
    ]);
    middleware.dispatch(() => {
      expect(called).to.be.true;
      done();
    });
  });
  it('should pass args', (done) => {
    const middleware = new Middleware([
      (arg, next) => {
        expect(arg).to.equal(69);
        next();
      },
    ]);
    middleware.dispatch(69, done);
  });
  describe('error handling', () => {
    it('should skip when necessary', (done) => {
      let progress = 0;
      const middleware = new Middleware([
        (next) => {
          progress += 1;
          next();
        },
        (error, next) => {
          throw new Error();
        },
        (next) => {
          progress += 1;
          next();
        },
      ]);
      middleware.dispatch((error) => {
        expect(error).to.equal(undefined);
        expect(progress).to.equal(2);
        done();
      });
    });
    it('should use when necessary', (done) => {
      let progress = 0;
      const middleware = new Middleware([
        (next) => {
          progress += 1;
          next(new Error());
        },
        (error, next) => {
          next(error);
        },
        (next) => {
          progress += 1;
          next();
        },
      ]);
      middleware.dispatch((error) => {
        expect(error).to.not.equal(undefined);
        expect(progress).to.equal(1);
        done();
      });
    });
  });
});