[WIP] Improvements to unit tests. (#3574)

* Improvemenets to unit tests.

* Break up modelfactory into multiple files, populate many states.
* Begin testing validation at the unit test level, test relationships.
* Add tests for Asset::availableForCheckout.
* Model factories now generate all needed relationships on demand,
  which allows us to unit test with a empty database.
* To faciliate the empty database, we move to using sqlite in memory as
  the unit testing database.

* Fix bug with logs of checkouts to non users.

* Fix location finding for assets.  Also Fix location show page to show users associated with location.  Still need some work to show assets.

* More test and generator improvements

* More unit test fixes. PermissionsTest is borked still.

* More Updates

* Rewrite permissionstest.  Check that we have access on the model level rather than via web requests.  Also test delete permissions.

* Fix seeders.

* Make the default asset model factory generate assets that are rtd for testing.

* Save progress.

* Rebase tests, fix department unit test, update database for functional tests.

* Update functional and api tests to use new modelfactory signatures.

app/Http/Controllers/Api/UsersController.php

@@ -50,7 +50,11 @@ class UsersController extends Controller
         }
 
         if ($request->has('company_id')) {
-            $users = $users->where('company_id','=',$request->input('company_id'));
+            $users = $users->where('company_id', '=', $request->input('company_id'));
+        }
+
+        if ($request->has('location_id')) {
+            $users = $users->where('location_id', '=', $request->input('location_id'));
         }
 
         if ($request->has('department_id')) {