Added test on ViewTest

flight/template/View.php

@@ -121,6 +121,12 @@ class View
         \extract($this->vars);
 
         include $this->template;
+
+        if ($data !== null) {
+            foreach (array_keys($data) as $variable) {
+                unset($this->vars[$variable]);
+            }
+        }
     }
 
     /**

tests/ViewTest.php

@@ -152,4 +152,18 @@ class ViewTest extends TestCase
             $viewMock::normalizePath('C:/xampp/htdocs/libs/Flight\core\index.php', '°')
         );
     }
+
+    public function testItDoesNotKeepThePreviousStateOfOneViewComponent(): void
+    {
+        $this->expectOutputString("<div>Hi</div>\n<div></div>\n");
+        $this->view->render('myComponent', ['prop' => 'Hi']);
+
+        set_error_handler(function (int $code, string $message): void {
+            $this->assertMatchesRegularExpression('/^Undefined variable:? \$?prop$/', $message);
+        });
+
+        $this->view->render('myComponent');
+
+        restore_error_handler();
+    }
 }

tests/views/myComponent.php

@@ -0,0 +1 @@
+<div><?= $prop ?></div>