test: add test for editor accessibility

Author: Alexis

client/modules/IDE/components/EditorAccessibility.unit.test.jsx

@@ -0,0 +1,40 @@
+import React from 'react';
+
+import { render, screen } from '../../../test-utils';
+
+import EditorAccessibility from './EditorAccessibility';
+
+describe('<EditorAccessibility />', () => {
+  it('renders empty message with no lines', () => {
+    render(<EditorAccessibility lintMessages={[]} />);
+
+    expect(
+      screen.getByRole('listitem', {
+        description: 'There are no lint messages'
+      })
+    ).toBeInTheDocument();
+  });
+
+  it('renders lint message', () => {
+    render(
+      <EditorAccessibility
+        lintMessages={[
+          {
+            severity: 'info',
+            line: '1',
+            message: 'foo',
+            id: '1a2b3c'
+          }
+        ]}
+      />
+    );
+
+    expect(
+      screen.queryByText('There are no lint messages')
+    ).not.toBeInTheDocument();
+
+    const listItem = screen.getByRole('listitem');
+    expect(listItem).toBeInTheDocument();
+    expect(listItem.textContent).toEqual('info in line1 :foo');
+  });
+});