Add more tests (#870)

* tests: be more systematic when testing discrete column types

Still not covering all due to SQLite limitation

* tests: relations of models

* tests: model in another namespace gets correctly qualified

* tests: cover SoftDeletes trait

* tests: cover some variants of getter

tests/Console/ModelsCommand/Relations/ModelsOtherNamespace/AnotherModel.php

@@ -0,0 +1,9 @@
+<?php declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\Relations\ModelsOtherNamespace;
+
+use Illuminate\Database\Eloquent\Model;
+
+class AnotherModel extends Model
+{
+}