Create unit tests for Toast component.

Author: lindapaiste

client/modules/IDE/components/Toast.jsx

@@ -13,7 +13,7 @@ export default function Toast() {
     return null;
   }
   return (
-    <section className="toast">
+    <section className="toast" role="status" aria-live="polite">
       <p>{t(text)}</p>
       <button
         className="toast__close"

client/modules/IDE/components/Toast.test.jsx

@@ -0,0 +1,54 @@
+import React from 'react';
+import {
+  act,
+  reduxRender,
+  screen,
+  fireEvent,
+  waitFor
+} from '../../../test-utils';
+import { setToastText, showToast } from '../actions/toast';
+import Toast from './Toast';
+
+// TODO: update action calls after reducer refactor is merged.
+
+describe(`Toast`, () => {
+  it('is hidden by default', () => {
+    reduxRender(<Toast />);
+    expect(screen.queryByRole('status')).not.toBeInTheDocument();
+  });
+
+  it('opens when an action is dispatched', async () => {
+    const { store } = reduxRender(<Toast />);
+    act(() => {
+      store.dispatch(showToast(1500));
+      store.dispatch(setToastText('Toast.SketchSaved'));
+    });
+
+    const toast = screen.queryByRole('status');
+    expect(toast).toBeVisible();
+    expect(toast).toHaveTextContent('Sketch saved.');
+  });
+
+  it('closes automatically after time', async () => {
+    const { store } = reduxRender(<Toast />);
+    act(() => {
+      store.dispatch(showToast(100));
+      store.dispatch(setToastText('Toast.SketchSaved'));
+    });
+
+    expect(screen.queryByRole('status')).toBeInTheDocument();
+
+    await waitFor(() => {
+      expect(screen.queryByRole('status')).not.toBeInTheDocument();
+    });
+  });
+
+  it('closes when "X" button is pressed', () => {
+    reduxRender(<Toast />, {
+      initialState: { toast: { isVisible: true, text: 'Hello World' } }
+    });
+    const button = screen.getByRole('button');
+    fireEvent.click(button);
+    expect(screen.queryByRole('status')).not.toBeInTheDocument();
+  });
+});