MAGETWO-31834: Fatal error if trying to navigate to Frontend at first time after install

 - update unit tests

Author: Dale Sikkema

lib/internal/Magento/Framework/ObjectManager/Test/Unit/Code/Generator/ConverterTest.php

@@ -92,16 +92,16 @@ public function testGenerate()
         $this->classGenerator->expects($this->once())
             ->method('setName')
             ->with(self::RESULT_CLASS_NAME)
-            ->will($this->returnSelf());
+            ->willReturnSelf();
         $this->classGenerator->expects($this->once())
             ->method('addProperties')
-            ->will($this->returnSelf());
+            ->willReturnSelf();
         $this->classGenerator->expects($this->once())
             ->method('addMethods')
-            ->will($this->returnSelf());
+            ->willReturnSelf();
         $this->classGenerator->expects($this->once())
             ->method('setClassDocBlock')
-            ->will($this->returnSelf());
+            ->willReturnSelf();
         $this->classGenerator->expects($this->once())
             ->method('generate')
             ->will($this->returnValue($generatedCode));