magento/magento2##15505: Interceptor class methods do not support nullable return types.

- removed junk;
- use 'required' PHP_Unit directive to skip tests, which require PHP 7.1.

Author: al.kravchuk

dev/tests/integration/testsuite/Magento/Framework/Code/GeneratorTest.php

@@ -187,13 +187,11 @@ public function testGenerateClassExtensionAttributesInterfaceFactoryWithNamespac
         $this->assertEquals($expectedContent, $content);
     }
 
+    /**
+     * @requires PHP 7.1
+     */
     public function testGenerateClassProxyWithNamespace71()
     {
-        if (!$this->shouldRun71()) {
-            $this->assertTrue(true);
-            return;
-        }
-
         $proxyClassName = self::CLASS_NAME_WITH_NAMESPACE_71 . '\Proxy';
         $result = false;
         $generatorResult = $this->_generator->generateClass($proxyClassName);
@@ -219,13 +217,11 @@ public function testGenerateClassProxyWithNamespace71()
         }
     }
 
+    /**
+     * @requires PHP 7.1
+     */
     public function testGenerateClassInterceptorWithNamespace71()
     {
-        if (!$this->shouldRun71()) {
-            $this->assertTrue(true);
-            return;
-        }
-
         $interceptorClassName = self::CLASS_NAME_WITH_NAMESPACE_71 . '\Interceptor';
         $result = false;
         $generatorResult = $this->_generator->generateClass($interceptorClassName);
@@ -246,12 +242,4 @@ public function testGenerateClassInterceptorWithNamespace71()
             $this->assertEquals($expectedContent, $content);
         }
     }
-
-    /**
-     * @return bool
-     */
-    private function shouldRun71():bool
-    {
-        return version_compare(phpversion(), '7.1.0', '>=');
-    }
 }

lib/internal/Magento/Framework/Interception/Code/Generator/Interceptor.php

@@ -8,7 +8,7 @@
 
 /**
  * Class Interceptor
- ˚*
+ *
  * @package Magento\Framework\Interception\Code\Generator
  */
 class Interceptor extends \Magento\Framework\Code\Generator\EntityAbstract