fix(a11y): datagrid-fix tests for screen reader text

projects/angular/src/data/datagrid/datagrid.spec.ts

@@ -753,13 +753,12 @@ export default function (): void {
  expect(actionOverflowCell.length).toEqual(0);
  });
 
- it('should have aria-label with value `Select one of actionable rows`', function () {
+ it('should have screen reader only text with value `Select one of actionable rows`', function () {
  context = this.create(ClrDatagrid, ActionableRowTest);
  context.getClarityProvider(RowActionService);
  expect(
- context.clarityElement
- .querySelector('.datagrid-header .datagrid-column.datagrid-row-actions')
- .getAttribute('aria-label')
+ context.clarityElement.querySelector('.datagrid-header .datagrid-column.datagrid-row-actions .clr-sr-only')
+ .textContent
  ).toBe('Select one of actionable rows');
  });
  });
@@ -805,9 +804,9 @@ export default function (): void {
  const context = this.create(ClrDatagrid, ExpandableRowTest);
  context.getClarityProvider(RowActionService);
  expect(
- context.clarityElement
- .querySelector('.datagrid-header .datagrid-column.datagrid-expandable-caret')
-  .getAttribute('aria-label')
+ context.clarityElement.querySelector(
+ '.datagrid-header .datagrid-column.datagrid-expandable-caret .clr-sr-only'
+ ).textContent
  ).toBe('Expand one of the rows');
  });
  });