Add required CS fixes

Author: Luke Lanchester

tests/PhpWordTests/Reader/Word2007/ElementTest.php

@@ -278,9 +278,9 @@ public function testReadTitleStyle(): void
     }
 
     /**
-     * Test reading of nested table
+     * Test reading of nested table.
      */
-    public function testReadNestedTable()
+    public function testReadNestedTable(): void
     {
         $documentXml = '<w:tbl>
           <w:tr>
@@ -299,14 +299,14 @@ public function testReadNestedTable()
           </w:tr>
         </w:tbl>';
 
-        $phpWord = $this->getDocumentFromString(array('document' => $documentXml));
+        $phpWord = $this->getDocumentFromString(['document' => $documentXml]);
 
         $section = $phpWord->getSection(0);
         $table = $section->getElement(0);
         $rows = $table->getRows();
         $cells = $rows[0]->getCells();
         $nestedTable = $cells[0]->getElement(0);
-        $this->assertInstanceOf('PhpOffice\PhpWord\Element\Table', $nestedTable);
+        self::assertInstanceOf('PhpOffice\PhpWord\Element\Table', $nestedTable);
     }
 
     /**