Merge branch '2.8' into 3.3

* 2.8:
  Refactoring tests.

Author: nicolas-grekas

Tests/OptionsResolverTest.php

@@ -1419,12 +1419,12 @@ public function testArrayAccess()
         });
 
         $this->resolver->setDefault('lazy2', function (Options $options) {
-            Assert::assertTrue(isset($options['default1']));
-            Assert::assertTrue(isset($options['default2']));
-            Assert::assertTrue(isset($options['required']));
-            Assert::assertTrue(isset($options['lazy1']));
-            Assert::assertTrue(isset($options['lazy2']));
-            Assert::assertFalse(isset($options['defined']));
+            Assert::assertArrayHasKey('default1', $options);
+            Assert::assertArrayHasKey('default2', $options);
+            Assert::assertArrayHasKey('required', $options);
+            Assert::assertArrayHasKey('lazy1', $options);
+            Assert::assertArrayHasKey('lazy2', $options);
+            Assert::assertArrayNotHasKey('defined', $options);
 
             Assert::assertSame(0, $options['default1']);
             Assert::assertSame(42, $options['default2']);