PHP Laravel API test failure unexplained

I am following a tutorial PluralSight by Stephen Macguire "Play by Play: Getting Started with Laravel 5", the code for which is on GitHub http://ift.tt/2gITLk5.

(However, the code below is slightly different from the code on GitHub. The code on Git Hub has the line in the test:

$this->post(route('api.products.store'), $product->jsonSerialize(), $this->jsonHeaders)

In my test the code has the line:

$this->post(route('api.products.store'), $product->jsonSerialize())

My other tests post without the "$this->jsonHeaders" successfully and this does not give the error.)

I am running a test to confirm that when I try to post a request to create a product with an empty name, that the JSON response has 'The name field is required.' Moreover the status of the of the response should be 422 - Unprocessable Entity.

However, though the ProductController validates that the name is required:

class ProductController extends Controller
{
    public function index() {
      return Product::paginate();
    }

    public function store(Request $request)
    {
      $this->validate($request, [
          'name' => 'required|unique:products',
      ]);

      return Product::create([
        'name' => $request->input('name')
      ]);
    }

    public function update(Request $request, $id)
    {
        $this->validate($request, [
            'name' => 'required|unique:products',
        ]);
        $product = Product::findOrFail($id);
        $product->update([
            'name' => $request->input('name')
        ]);
        return $product;
    }
}

The test that fails is as follows:

public function testCreateProductFailsIfNameNotProvided()
    {
        $product = factory(Product::class)->make(['name' => '']);

        $this->post(route('products.store'), $product->jsonSerialize())
             ->seeJson(['name' => ['The name field is required.']])
             ->assertResponseStatus(422);
    }

The testing is command line phpunit with the following output:

There was 1 failure:

1) ExampleTest::testCreateProductFailsIfNameNotProvided
Invalid JSON was returned from the route. Perhaps an exception was thrown?

/home/vagrant/projects/demo/vendor/laravel/framework/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php:426
/home/vagrant/projects/demo/vendor/laravel/framework/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php:298
/home/vagrant/projects/demo/vendor/laravel/framework/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php:324
/home/vagrant/projects/demo/tests/ExampleTest.php:74

If the "->seeJson" line in the test is commented off the following failure is recorded:

1) ExampleTest::testCreateProductFailsIfNameNotProvided
Expected status code 422, got 302.
Failed asserting that 302 matches expected 422.

/home/vagrant/projects/demo/vendor/laravel/framework/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php:744
/home/vagrant/projects/demo/tests/ExampleTest.php:75

Laravel Framework version 5.3.26, testing phpunit, Laravel Homestead in Vagrant Box running in VM VirtualBox

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