Added initial Th test file

packages/react-table/src/components/Table/__tests__/Th.test.tsx

@@ -0,0 +1,31 @@
+import * as React from 'react';
+import { render, screen } from '@testing-library/react';
+import { Th } from '../Th';
+
+test('Does not render with aria-label by default', () => {
+  render(<Th />);
+  expect(screen.getByRole('columnheader')).not.toHaveAccessibleName();
+});
+
+test('Renders with aria-label when passed in', () => {
+  render(<Th aria-label="Test" />);
+  expect(screen.getByRole('columnheader')).toHaveAccessibleName('Test');
+});
+
+test('Does not render with screen reader text by default', () => {
+  render(<Th />);
+
+  expect(screen.getByRole('columnheader')).toBeEmptyDOMElement();
+});
+
+test('Does not render with screen reader text when children are passed in', () => {
+  render(<Th screenReaderText="Test">Heading label</Th>);
+
+  expect(screen.getByRole('columnheader')).not.toHaveTextContent('Test');
+});
+
+test('Renders with screen reader text when screenReaderText is passed in', () => {
+  render(<Th screenReaderText="Test" />);
+
+  expect(screen.getByRole('columnheader')).toHaveTextContent('Test');
+});