add test case for accessing current scope before its value has been set (#552)

Author: Plastonick

src/TransformerAbstract.php

@@ -38,7 +38,7 @@ abstract class TransformerAbstract
     /**
      * The transformer should know about the current scope, so we can fetch relevant params.
      */
-    protected ?Scope $currentScope;
+    protected ?Scope $currentScope = null;
 
     /**
      * Getter for availableIncludes.

test/TransformerAbstractTest.php

@@ -74,6 +74,16 @@ public function testGetCurrentScope()
         $this->assertSame($transformer->getCurrentScope(), $scope);
     }
 
+    /**
+     * @covers \League\Fractal\TransformerAbstract::getCurrentScope
+     */
+    public function testCanAccessScopeBeforeInitialization()
+    {
+        $transformer = $this->getMockForAbstractClass('League\Fractal\TransformerAbstract');
+        $currentScope = $transformer->getCurrentScope();
+        $this->assertNull($currentScope);
+    }
+
     public function testProcessEmbeddedResourcesNoAvailableIncludes()
     {
         $transformer = m::mock('League\Fractal\TransformerAbstract')->makePartial();