test: update Code tests to use react testing library

packages/react/src/components/Code/Code.test.tsx

@@ -0,0 +1,87 @@
+import React from 'react';
+import { render } from '@testing-library/react';
+import { axe } from 'jest-axe';
+import { createSandbox } from 'sinon';
+import Code from './';
+
+const sandbox = createSandbox();
+
+beforeEach(() => {
+  global.ResizeObserver = global.ResizeObserver || (() => null);
+  sandbox.stub(global, 'ResizeObserver').callsFake((listener) => {
+    listener();
+    return {
+      observe: sandbox.stub(),
+      disconnect: sandbox.stub()
+    };
+  });
+});
+
+afterEach(() => {
+  sandbox.restore();
+});
+
+test('should render Code block', () => {
+  const { container } = render(
+    <Code language="javascript">{`var some = "javascript"`}</Code>
+  );
+  expect(container.querySelector('pre')).toHaveClass('Code');
+  expect(container.querySelector('pre')).not.toHaveClass('Code--scrollable');
+  expect(container.querySelector('pre')).toHaveTextContent(
+    'var some = "javascript"'
+  );
+});
+
+test('should set tabIndex when element is scrollable', () => {
+  // Mock the specific state expected when the tab should be scrollable
+  sandbox.stub(global.HTMLPreElement.prototype, 'clientWidth').value(123);
+  sandbox.stub(global.HTMLPreElement.prototype, 'scrollWidth').value(456);
+
+  const { container } = render(
+    <Code language="javascript" scrollable>{`var some = "javascript"`}</Code>
+  );
+  expect(container.querySelector('pre')).toHaveClass('Code--scrollable');
+  expect(container.querySelector('pre')).toHaveAttribute('tabIndex', '0');
+});
+
+test('should not set tabIndex when element is not scrollable', () => {
+  // Mock the specific state expected when the tab should not be scrollable
+  sandbox.stub(global.HTMLPreElement.prototype, 'clientWidth').value(123);
+  sandbox.stub(global.HTMLPreElement.prototype, 'scrollWidth').value(123);
+
+  const { container } = render(
+    <Code language="javascript" scrollable>{`var some = "javascript"`}</Code>
+  );
+  expect(container.querySelector('pre')).toHaveClass('Code--scrollable');
+  expect(container.querySelector('pre')).not.toHaveAttribute('tabIndex');
+});
+
+test('should support className prop', () => {
+  const { container } = render(
+    <Code
+      language="javascript"
+      className="bananas"
+    >{`var some = "javascript"`}</Code>
+  );
+  expect(container.querySelector('pre')).toHaveClass('Code', 'bananas');
+});
+
+test('should return no axe violations', async () => {
+  const { container } = render(
+    <Code language="javascript">{`var some = "javascript"`}</Code>
+  );
+  const results = await axe(container);
+  expect(results).toHaveNoViolations();
+});
+
+test('should return no axe violations when scrollable', async () => {
+  // Mock the specific state expected when the tab should be scrollable
+  sandbox.stub(global.HTMLPreElement.prototype, 'clientWidth').value(123);
+  sandbox.stub(global.HTMLPreElement.prototype, 'scrollWidth').value(456);
+
+  const { container } = render(
+    <Code language="javascript" scrollable>{`var some = "javascript"`}</Code>
+  );
+  const results = await axe(container);
+  expect(results).toHaveNoViolations();
+});