Fixed broken unit test

Author: johan-lindahl

lib/internal/Magento/Framework/View/Test/Unit/File/Collector/BaseTest.php

@@ -85,8 +85,7 @@ public function testGetFiles()
             ->method('create')
             ->willReturn($this->createFileMock());
         $this->themeMock->expects($this->once())
-            ->method('getData')
-            ->with('area')
+            ->method('getArea')
             ->willReturn('frontend');
 
         $result = $this->fileCollector->getFiles($this->themeMock, '*.xml');