Fix tests

patches/codeception-phpunit-8-fix.patch

@@ -0,0 +1,26 @@
+diff --git a/src/Codeception/Test/Cest.php b/src/Codeception/Test/Cest.php
+index c644ed2e..5426bf3f 100644
+--- a/src/Codeception/Test/Cest.php
++++ b/src/Codeception/Test/Cest.php
+@@ -150,7 +150,7 @@ protected function executeTestMethod($I)
+         $this->invoke($this->testMethod, [$I, $this->scenario]);
+     }
+ 
+-    public function toString()
++    public function toString(): string
+     {
+         return sprintf('%s: %s', ReflectionHelper::getClassShortName($this->getTestClass()), Message::ucfirst($this->getFeature()));
+     }
+diff --git a/src/Codeception/Test/Test.php b/src/Codeception/Test/Test.php
+index f5e8426f..99c9f0ae 100644
+--- a/src/Codeception/Test/Test.php
++++ b/src/Codeception/Test/Test.php
+@@ -55,7 +55,7 @@ abstract class Test implements TestInterface, Interfaces\Descriptive
+      *
+      * @return mixed
+      */
+-    abstract public function toString();
++    abstract public function toString(): string;
+ 
+     /**
+      * Runs a test and collects its result in a TestResult instance.