Lumen 5.5 unit-test post json

learning Lumen v5.5 php framework and have hit a roadblock creating my first php unit test. The app works using Postman if I set the URL and select POST method and in the body choose "raw" and set the type to "application/json". So we already know the post works, just looking to crate a test.

Here is the closest thing to what i think a working unit test should be:

public function testPostJson() {
    $the_json    = '{"client_guid": "C00A0EA5-3F64-01EA-C4B6-159EA145AB3B"}';
    $the_headers = [ 'CONTENT_TYPE' => 'application/json' ];
    $this->call(
        'POST',
        '/getClientNotes',
        [],
        [],
        [],
        $the_headers,
        $the_json
    );
    $this->assertResponseOk();
    $this->assertEquals(true, $this->response->status);
}

But of course it returns errors like:

• 1) NotesTest::testPostJson Expected status code 200, got 404.*
• 2) ErrorException: Undefined property: Illuminate\Http\Response::$status

Not much in the way of documentation even at the lumen docs site: http://ift.tt/2xtF7pl