Builder page: added unit test for drag & drop of skill

src/components/builder/lists/ListItem.js

@@ -7,6 +7,8 @@ import { MdMoreVert } from 'react-icons/md';
 import { useDispatch } from '../../../contexts/ResumeContext';
 import styles from './ListItem.module.css';
 
+const dataTestIdPrefix = 'list-item-';
+
 const ListItem = ({
   title,
   subtitle,
@@ -73,6 +75,7 @@ const ListItem = ({
         <div
           ref={dragProvided.innerRef}
           className={styles.listItem}
+          data-testid={`${dataTestIdPrefix}${path}`}
           {...dragProvided.draggableProps}
           {...dragProvided.dragHandleProps}
         >
@@ -130,3 +133,5 @@ const ListItem = ({
 };
 
 export default memo(ListItem);
+
+export { dataTestIdPrefix };

src/pages/app/__tests__/builder.skills.test.js

@@ -0,0 +1,63 @@
+import { get } from 'lodash';
+import { screen } from '@testing-library/react';
+
+import { DatabaseConstants } from 'gatsby-plugin-firebase';
+
+import { dataTestIdPrefix as listItemDataTestIdPrefix } from '../../../components/builder/lists/ListItem';
+
+import {
+  setupAndWait,
+  expectDatabaseUpdateToHaveCompleted,
+  dragAndDropDirectionDown,
+  dragAndDropListItem,
+} from './helpers/builder';
+
+const testTimeoutInMilliseconds = 20000;
+jest.setTimeout(testTimeoutInMilliseconds);
+
+test('allows to drag & drop', async () => {
+  const resumeId = DatabaseConstants.demoStateResume1Id;
+  const { resume, mockDatabaseUpdateFunction } = await setupAndWait(
+    resumeId,
+    true,
+    true,
+  );
+
+  const now = new Date().getTime();
+
+  const dataPath = 'skills.items';
+  const dataItems = get(resume, dataPath);
+  expect(dataItems.length).toBeGreaterThan(1);
+
+  const listItems = screen.getAllByTestId(
+    `${listItemDataTestIdPrefix}${dataPath}`,
+  );
+  const firstListItem = listItems[0];
+  expect(firstListItem).toHaveTextContent(dataItems[0].name);
+  const secondListItem = listItems[1];
+  expect(secondListItem).toHaveTextContent(dataItems[1].name);
+
+  dragAndDropListItem(firstListItem, dragAndDropDirectionDown);
+
+  const actualListItems = screen.getAllByTestId(
+    `${listItemDataTestIdPrefix}${dataPath}`,
+  );
+  const actualFirstListItem = actualListItems[0];
+  expect(actualFirstListItem).toHaveTextContent(dataItems[1].name);
+  const actualSecondListItem = actualListItems[1];
+  expect(actualSecondListItem).toHaveTextContent(dataItems[0].name);
+
+  await expectDatabaseUpdateToHaveCompleted(mockDatabaseUpdateFunction);
+  const mockDatabaseUpdateFunctionCallArgument =
+    mockDatabaseUpdateFunction.mock.calls[0][0];
+  expect(mockDatabaseUpdateFunctionCallArgument.id).toBe(resumeId);
+  expect(mockDatabaseUpdateFunctionCallArgument.skills.items[0]).toEqual(
+    dataItems[1],
+  );
+  expect(mockDatabaseUpdateFunctionCallArgument.skills.items[1]).toEqual(
+    dataItems[0],
+  );
+  expect(
+    mockDatabaseUpdateFunctionCallArgument.updatedAt,
+  ).toBeGreaterThanOrEqual(now);
+});

src/pages/app/__tests__/helpers/builder.js

@@ -1,5 +1,6 @@
 import React from 'react';
 import {
+  fireEvent,
   render,
   screen,
   waitFor,
@@ -46,6 +47,36 @@ const expectDatabaseUpdateToHaveCompleted = async (
   );
 };
 
+const dragAndDropDirectionUp = 'DND_DIRECTION_UP';
+const dragAndDropDirectionDown = 'DND_DIRECTION_DOWN';
+
+const dragAndDropListItem = (listItemElement, direction) => {
+  const spaceKey = { keyCode: 32 };
+  const arrowUpKey = { keyCode: 38 };
+  const arrowDownKey = { keyCode: 40 };
+  const getKeyForDirection = () => {
+    switch (direction) {
+      case dragAndDropDirectionUp:
+        return arrowUpKey;
+      case dragAndDropDirectionDown:
+        return arrowDownKey;
+      default:
+        throw new Error('Unhandled `direction`!');
+    }
+  };
+
+  listItemElement.focus();
+
+  // enable keyboard dragging
+  fireEvent.keyDown(listItemElement, spaceKey);
+
+  // move element based on direction
+  fireEvent.keyDown(listItemElement, getKeyForDirection());
+
+  // disable keyboard dragging
+  fireEvent.keyDown(listItemElement, spaceKey);
+};
+
 // eslint-disable-next-line no-underscore-dangle
 async function _setup(
   resumeId,
@@ -124,4 +155,7 @@ export {
   setupAndWait,
   waitForDatabaseUpdateToHaveCompletedFn as waitForDatabaseUpdateToHaveCompleted,
   expectDatabaseUpdateToHaveCompleted,
+  dragAndDropDirectionUp,
+  dragAndDropDirectionDown,
+  dragAndDropListItem,
 };