@Test
public void toggle_row_hide_by_drag () {
final int ROW_6 = 5;
spreadsheet.focus(ROW_6, 0);
Header header = spreadsheet.getLeftPanel().getRowHeader(ROW_6);
Assert.assertTrue("Header shall be visible and has width", header.isVisible() && header.getHeight() > 0);
mouseDirector.dragRowToHide(ROW_6);
Assert.assertTrue("Header shall be hidden", !header.isVisible());
mouseDirector.dragRowToResize(ROW_6, 50);
Assert.assertTrue("Header shall be unhide", header.isVisible() && header.getHeight() == 50);
}