StyleMerger and RowManager changes

Move DI of StyleMerger to get rid of business logic in the entities Cell and Row
Simplify RowManager

tests/Spout/Writer/Common/Manager/RowManagerTest.php

@@ -2,7 +2,6 @@
 
 namespace Spout\Writer\Common\Manager;
 
-use Box\Spout\Writer\Common\Creator\Style\StyleBuilder;
 use Box\Spout\Writer\Common\Entity\Cell;
 use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Manager\RowManager;
@@ -11,51 +10,6 @@ use PHPUnit\Framework\TestCase;
 
 class RowManagerTest extends TestCase
 {
-    /**
-     * @return void
-     */
-    public function testApplyStyle()
-    {
-        $rowManager = new RowManager(new StyleMerger());
-        $row = new Row([new Cell('test')], null, $rowManager);
-
-        $this->assertFalse($row->getStyle()->isFontBold());
-
-        $style = (new StyleBuilder())->setFontBold()->build();
-        $rowManager->applyStyle($row, $style);
-
-        $this->assertTrue($row->getStyle()->isFontBold());
-    }
-
-    /**
-     * @return array
-     */
-    public function dataProviderForTestHasCells()
-    {
-        return [
-            // cells, expected hasCells
-            [[], false],
-            [[new Cell('')], true],
-            [[new Cell(null)], true],
-            [[new Cell('test')], true],
-        ];
-    }
-
-    /**
-     * @dataProvider dataProviderForTestHasCells
-     *
-     * @param array $cells
-     * @param bool $expectedHasCells
-     * @return void
-     */
-    public function testHasCells(array $cells, $expectedHasCells)
-    {
-        $rowManager = new RowManager(new StyleMerger());
-
-        $row = new Row($cells, null, $rowManager);
-        $this->assertEquals($expectedHasCells, $rowManager->hasCells($row));
-    }
-
     /**
      * @return array
      */