Merge branch '6.4' into 7.1

* 6.4:
  do not base services on PHPUnit mocks
  do not use TestCase::getName() when possible
  do not use assertCount() with generators

Tests/Iterator/LazyIteratorTest.php

@@ -29,7 +29,7 @@ public function testDelegate()
     {
         $iterator = new LazyIterator(fn () => new Iterator(['foo', 'bar']));
 
-        $this->assertCount(2, $iterator);
+        $this->assertCount(2, iterator_to_array($iterator));
     }
 
     public function testInnerDestructedAtTheEnd()