Testing Lab 4: Nested Components

Objectives

• Test Setup
• Testing that Projects Display
• Testing Form Display
• Testing Form Cancel

Steps

Test Setup

1. Create the file src\projects\__tests__\ProjectList-test.js.

2. Add the setup code below to test the component.

   src\projects\__tests__\ProjectList-test.js

   import { render, screen } from '@testing-library/react';
   import React from 'react';
   import { MemoryRouter } from 'react-router-dom';
   import ProjectList from '../ProjectList';
   import { MOCK_PROJECTS } from '../MockProjects';
   import userEvent from '@testing-library/user-event';
   import { Provider } from 'react-redux';
   import { store } from '../../state';
   
   describe('<ProjectList />', () => {
     const setup = () =>
       render(
         <Provider store={store}>
           <MemoryRouter>
             <ProjectList projects={MOCK_PROJECTS} />
           </MemoryRouter>
         </Provider>
       );
   
     beforeEach(() => {});
   
     test('should render without crashing', () => {
       setup();
       expect(screen).toBeDefined();
     });
   });

3. Verify the initial test passes.

     PASS  src/projects/__tests__/ProjectList-test.js

Testing that Projects Display

1. Test that the projects display correctly.

   src\projects\__tests__\ProjectList-test.js

   ...
   describe('<ProjectList />', () => {
     const setup = () =>
       render(
         <Provider store={store}>
           <MemoryRouter>
             <ProjectList projects={MOCK_PROJECTS} />
           </MemoryRouter>
         </Provider>
       );
   
     beforeEach(() => {});
   
     test('should render without crashing', () => {
       setup();
       expect(screen).toBeDefined();
     });
   
   +  test('should display list', () => {
   +    setup();
   +    expect(screen.getAllByRole('heading')).toHaveLength(MOCK_PROJECTS.length);
   +    expect(screen.getAllByRole('img')).toHaveLength(MOCK_PROJECTS.length);
   +    expect(screen.getAllByRole('link')).toHaveLength(MOCK_PROJECTS.length);
   +    expect(screen.getAllByRole('button')).toHaveLength(MOCK_PROJECTS.length);
   +  });
   
   });

1. Verify the test passes.
   ```shell
   PASS  src/projects/__tests__/ProjectList-test.js

Testing Form Display

1. Modify the card component to add an aria-label so we can access the button in the test.

   src\projects\ProjectCard.js

   ...
   function ProjectCard(props: ProjectCardProps) {
   ...
   
     return (
       <div className="card">
         <img src={project.imageUrl} alt={project.name} />
         <section className="section dark">
           <Link to={'/projects/' + project.id}>
             <h5 className="strong">
               <strong>{project.name}</strong>
             </h5>
             <p>{formatDescription(project.description)}</p>
             <p>Budget : {project.budget.toLocaleString()}</p>
           </Link>
           <button
   +          aria-label={`edit ${project.name}`}
             className=" bordered"
             onClick={() => {
               handleEditClick(project);
             }}
           >
             <span className="icon-edit "></span>
             Edit
           </button>
         </section>
       </div>
     );
   }
   
   export default ProjectCard;
   

2. Modify the form component to add an aria-label and a name (which gives an implicit role of form) so we can access the form in the test.

   src\projects\ProjectForm.js

   ...
   
   function ProjectForm({ project: initialProject, onCancel }) {
     ...
   
     return (
       <form
   +      aria-label="Edit a Project"
   +      name="projectForm"
         className="input-group vertical"
         onSubmit={handleSubmit}
       >
         ...
       </form>
     );
   }
   
   export default ProjectForm;

3. Test that the form is displayed when edit is clicked.

   src\projects\__tests__\ProjectList-test.js

   ...
   
   describe('<ProjectList />', () => {
   ...
   
     test('should display list', () => {
       ...
     });
   
   +  test('should display form when edit clicked', async () => {
   +    setup();
   +    // eslint-disable-next-line testing-library/render-result-naming-convention
   +    const user = userEvent.setup();
   +    await user.click(
   +      screen.getByRole('button', { name: /edit Wisozk Group/i })
   +    );
   +    expect(
   +      screen.getByRole('form', {
   +        name: /edit a project/i,
   +      })
   +    ).toBeInTheDocument();
   +  });
   });

4. Verify the test passes.

   PASS  src/projects/__tests__/ProjectList-test.js

Testing Form Cancel

1. Test that the form is removed after clicking cancel.

src\projects\__tests__\ProjectList-test.js

...

describe('<ProjectList />', () => {
...

+  test('should display image and remove form when cancel clicked', async () => {
+    setup();
+    // eslint-disable-next-line testing-library/render-result-naming-convention
+    const user = userEvent.setup();
+    await user.click(
+      screen.getByRole('button', { name: /edit Wisozk Group/i })
+    );
+    await user.click(
+      screen.getByRole('button', {
+        name: /cancel/i,
+      })
+    );
+    expect(
+      screen.getByRole('img', {
+        name: /wisozk group/i,
+      })
+    ).toBeInTheDocument();
+    expect(
+      screen.queryByRole('form', {
+        name: /edit a project/i,
+      })
+    ).not.toBeInTheDocument();
+  });

});

1. Verify the test passes.

   PASS  src/projects/__tests__/ProjectList-test.js

---

✔ You have completed Testing Lab 4