Make sure transformers match API definition.

tests/Unit/Transformers/BillTransformerTest.php

@@ -28,6 +28,7 @@ use FireflyIII\Models\Bill;
 use FireflyIII\Repositories\Bill\BillRepositoryInterface;
 use FireflyIII\Transformers\BillTransformer;
 use Illuminate\Support\Collection;
+use Log;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Tests\TestCase;
 
@@ -36,6 +37,16 @@ use Tests\TestCase;
  */
 class BillTransformerTest extends TestCase
 {
+
+    /**
+     *
+     */
+    public function setUp(): void
+    {
+        parent::setUp();
+        Log::info(sprintf('Now in %s.', \get_class($this)));
+    }
+
     /**
      * Basic coverage
      *