[tests] Add fixture with nullable param (#64)

* Create SkipExplicitlyNullableParams.php

* Update NarrowPublicClassMethodParamTypeRuleTest.php

* if only bool is passed, it should be required

---------

Co-authored-by: Michael Bolli <michael@bolli.us>

Author: TomasVotruba

tests/Rules/NarrowPublicClassMethodParamTypeRule/Fixture/ExplicitlyNullableParams.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\TypePerfect\Tests\Rules\NarrowPublicClassMethodParamTypeRule\Fixture;
+
+final class ExplicitlyNullableParams
+{
+    public function test(
+        ?bool $bool = true,
+    ): bool
+    {
+        return $bool;
+    }
+
+    static public function run(): void
+    {
+        $skipDateTimeMix = new ExplicitlyNullableParams();
+        $skipDateTimeMix->test(false);
+    }
+}

tests/Rules/NarrowPublicClassMethodParamTypeRule/NarrowPublicClassMethodParamTypeRuleTest.php

@@ -155,7 +155,11 @@ public static function provideData(): Iterator
         yield [[__DIR__ . '/Fixture/SkipEnum.php'], []];
 
         $argErrorMessage = sprintf(NarrowPublicClassMethodParamTypeRule::ERROR_MESSAGE, 'int');
+
         yield [[__DIR__ . '/Fixture/HandleDefaultValue.php'], [[$argErrorMessage, 15]]];
+
+        $argErrorMessage = sprintf(NarrowPublicClassMethodParamTypeRule::ERROR_MESSAGE, 'bool');
+        yield [[__DIR__ . '/Fixture/ExplicitlyNullableParams.php'], [[$argErrorMessage, 9]]];
     }
 
     /**