Rework OrderControllerTest class

[cbj4074]

This class's setUp() method calls $this->markTestSkipped('The Order implementation is being reworked');, added as a temporary holdover during the Velkart package integration process.

This call needs to removed, and the relevant tests updated/reworked, as appropriate.

[cbj4074]

After further scrutiny, my instinct is that all of this functionality (and accompanying tests) should be moved into the Velkart package. I'll post another update soon, once I've worked through it. (I'm currently adding a Velkart section to the documentation, which will elucidate the details.)

[mblarsen]

Sounds reasonable 👍