First time sort direction logic update and testing

Author: sethu1504

components/data-table/private/header-cell.jsx

@@ -25,10 +25,6 @@ import {
 	DATA_TABLE_COLUMN,
 } from '../../../utilities/constants';
 
-// const defaultProps = {
-// 	firstSortDirection: 'asc'
-// };
-
 /**
  * Used internally, renders each individual column heading.
  */
@@ -84,8 +80,6 @@ class DataTableHeaderCell extends React.Component {
 		width: PropTypes.string,
 	};
 
-	// static defaultProps = defaultProps;
-
 	state = {
 		sortDirection: null,
 	};
@@ -133,7 +127,6 @@ class DataTableHeaderCell extends React.Component {
 		const { fixedHeader, isSorted, label, sortable, width } = this.props;
 
 		const labelType = typeof label;
-		// const sortDirection = (!this.props.sortDirection && !this.state.sortDirection && this.props.sortable) ? this.props.firstSortDirection : (this.props.sortDirection || this.state.sortDirection);
 		const sortDirection = this.props.sortDirection || this.state.sortDirection || this.props.firstSortDirection
 		const expandedSortDirection =
 			sortDirection === 'desc' ? 'descending' : 'ascending';