Add tests for empty attributes cast to array

test/tests/Fixtures/Models/ModelWithCasts.php

@@ -1,7 +1,25 @@
 <?php
-/**
- * Created by PhpStorm.
- * User: max
- * Date: 4/09/19
- * Time: 8:15 PM
- */
+
+namespace Specialtactics\L5Api\Tests\Fixtures\Models;
+
+use Specialtactics\L5Api\Models\RestfulModel;
+
+class ModelWithCasts extends RestfulModel
+{
+    /**
+     * @var string UUID key
+     */
+    public $primaryKey = 'model_with_casts_id';
+
+    /**
+     * @var array The attributes that are mass assignable.
+     */
+    protected $fillable = ['model_with_casts_id', 'array_attribute'];
+
+    /**
+     * @var array Casts
+     */
+    protected $casts = [
+        'array_attribute' => 'array'
+    ];
+}

test/tests/Unit/BaseTransformerTest.php

@@ -2,7 +2,9 @@
 
 namespace Specialtactics\L5Api\Tests\Unit;
 
+use Ramsey\Uuid\Uuid;
 use Specialtactics\L5Api\Tests\AppTestCase;
+use Specialtactics\L5Api\Tests\Fixtures\Models\ModelWithCasts;
 use Specialtactics\L5Api\Tests\Fixtures\Models\ModelWithIdPK;
 use Specialtactics\L5Api\Transformers\RestfulTransformer;
 
@@ -25,9 +27,29 @@ public function canTransformModelWithPKOfId()
         $this->assertEquals($transformed['exampleAttribute'], 'abc123');
     }
 
-
     /**
-     * @todo: Test for the situation of an attribute casted as array being null, and being converted to string inadvertently on transformation
+     * Make sure that an array cast attribute is transformed correctly, in situations when it's blank
+     *
+     * @test
      */
+    public function nullArrayCastWillBeEmptyArray()
+    {
+        //
+        // Array attribute is null
+        $model = new ModelWithCasts(['model_with_casts_id' => Uuid::uuid4()->toString(), 'array_attribute' => null]);
+
+        $transformed = (new RestfulTransformer)->transform($model);
 
+        $this->assertArrayHasKey('arrayAttribute', $transformed);
+        $this->assertNull($transformed['arrayAttribute']);
+
+        //
+        // Array attribute is empty
+        $model = new ModelWithCasts(['model_with_casts_id' => Uuid::uuid4()->toString(), 'array_attribute' => []]);
+
+        $transformed = (new RestfulTransformer)->transform($model);
+
+        $this->assertArrayHasKey('arrayAttribute', $transformed);
+        $this->assertCount(0, $transformed['arrayAttribute']);
+    }
 }