MAGETWO-36852: Code Coverage of South Modules

 - increase code coverage for Magento_Theme module

Author: AndriyNasinnyk

app/code/Magento/Theme/Test/Unit/Model/Theme/CollectionTest.php

@@ -46,6 +46,7 @@ protected function setUp()
             ->getMock();
         $this->themeConfigFactory = $this->getMockBuilder('Magento\Framework\Config\ThemeFactory')
             ->setMethods(['create'])
+            ->disableOriginalConstructor()
             ->getMock();
         $this->directory = $this->getMockBuilder('Magento\Framework\Filesystem\Directory\ReadInterface')
             ->disableOriginalConstructor()

app/code/Magento/Theme/Test/Unit/Model/Theme/FileProviderTest.php

@@ -23,6 +23,7 @@ protected function setUp()
     {
         $fileFactory = $this->getMockBuilder('Magento\Theme\Model\Resource\Theme\File\CollectionFactory')
             ->setMethods(['create'])
+            ->disableOriginalConstructor()
             ->getMock();
         $this->file = $this->getMockBuilder('Magento\Theme\Model\Resource\Theme\File\Collection')
             ->disableOriginalConstructor()

app/code/Magento/Theme/Test/Unit/Model/Theme/RegistrationTest.php

@@ -34,6 +34,7 @@ public function setUp()
     {
         $this->collectionFactory = $this->getMockBuilder('Magento\Theme\Model\Resource\Theme\Data\CollectionFactory')
             ->setMethods(['create'])
+            ->disableOriginalConstructor()
             ->getMock();
         $this->filesystemCollection = $this->getMockBuilder('Magento\Theme\Model\Theme\Data\Collection')
             ->disableOriginalConstructor()