Use assertStringContainsString for asserting strings

Author: Naktibalda

src/Codeception/Module/Laravel5.php

@@ -734,7 +734,7 @@ public function seeFormErrorMessage($key, $expectedErrorMessage = null)
         }
 
         if (! is_null($expectedErrorMessage)) {
-            $this->assertContains($expectedErrorMessage, $viewErrorBag->first($key));
+            $this->assertStringContainsString($expectedErrorMessage, $viewErrorBag->first($key));
         }
     }