Add failing test showing that this library does not work with res.write/res.end

[magicmark]

turns out this library doesn't work when apps call res.write / res.end 😬

I've added a failing test (with a .skip) that demonstrates this flaw.

╔═ markl@dev21-uswest1cdevc: ~/GitApps/tweenz git:(add_failing_test) ✗ virtualenv:(venv)
╚═ ♪ yarn test --no-watchman
yarn run v1.12.1
$ jest --coverage --no-watchman
 FAIL  __tests__/index.test.js
  middleware
    ✓ should work with res.json (38ms)
    ✓ should work with res.send (5ms)
    ✓ should work with res.send (json) (3ms)
    ✕ should work with res.end (11ms)

  ● middleware › should work with res.end

    expect(jest.fn()).toHaveBeenCalledWith(expected)

    Expected mock function to have been called with:
      "foobarbaz"
    as argument 1, but it was called with
      undefined.

    Difference:

      Comparing two different types of values. Expected string but received undefined.

      79 |             .end(() => {
      80 |                 expect(beforeFn).toHaveBeenCalled();
    > 81 |                 expect(afterFn).toHaveBeenCalledWith('foobarbaz');
         |                                 ^
      82 |                 done();
      83 |             });
      84 |     });

      at Test.toHaveBeenCalledWith (__tests__/index.test.js:81:33)
      at Test.Object.<anonymous>.Test.assert (node_modules/supertest/lib/test.js:181:6)
      at Server.localAssert (node_modules/supertest/lib/test.js:131:12)

----------|----------|----------|----------|----------|-------------------|
File      |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
----------|----------|----------|----------|----------|-------------------|
All files |      100 |      100 |      100 |      100 |                   |
 index.js |      100 |      100 |      100 |      100 |                   |
----------|----------|----------|----------|----------|-------------------|
Test Suites: 1 failed, 1 total
Tests:       1 failed, 3 passed, 4 total
Snapshots:   0 total
Time:        1.415s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Let's fix this :P

[mxmul]

lg2m!