fix(v2): minor codestyle fix

Author: rtm-ctrlz

src/MockedFunction.php

@@ -10,6 +10,8 @@
 use QratorLabs\Smocky\Functions\MockedFunction as GenericMockedFunction;
 use ReflectionException;
 
+use function assert;
+
 class MockedFunction extends AbstractMocked
 {
     private InvocationStubber $invocationMocker;
@@ -40,6 +42,7 @@ static function (...$args) use (&$mockObject, &$method) {
         );
 
         $method     = $this->mockedFunction->getShortName();
+        assert(!empty($method));
         $mockObject = self::createEmptyMock($testCase, $method);
 
         $this->invocationMocker = $invocationRule === null

src/MockedMethod.php

@@ -22,7 +22,7 @@ class MockedMethod extends AbstractMocked
      *
      * @param TestCase $testCase
      * @param string $class
-     * @param string $method
+     * @param non-empty-string $method
      * @param InvocationOrder|null $invocationRule
      *
      * @throws ReflectionException