/
Dropdown-test.js
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Dropdown-test.js
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/**
* Copyright IBM Corp. 2016, 2023
*
* This source code is licensed under the Apache-2.0 license found in the
* LICENSE file in the root directory of this source tree.
*/
import React from 'react';
import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import {
assertMenuOpen,
assertMenuClosed,
openMenu,
generateItems,
generateGenericItem,
} from '../ListBox/test-helpers';
import Dropdown from '../Dropdown';
import DropdownSkeleton from '../Dropdown/Dropdown.Skeleton';
import { Slug } from '../Slug';
const prefix = 'cds';
describe('Dropdown', () => {
let mockProps;
beforeEach(() => {
mockProps = {
id: 'test-dropdown',
items: generateItems(5, generateGenericItem),
onChange: jest.fn(),
label: 'input',
placeholder: 'Filter...',
type: 'default',
titleText: 'Dropdown label',
};
});
it('should initially render with the menu not open', () => {
render(<Dropdown {...mockProps} />);
assertMenuClosed();
});
it('should let the user open the menu by clicking on the control', async () => {
render(<Dropdown {...mockProps} />);
await openMenu();
assertMenuOpen(mockProps);
});
it('should render with strings as items', async () => {
render(<Dropdown {...mockProps} items={['zar', 'doz']} />);
await openMenu();
expect(screen.getByText('zar')).toBeInTheDocument();
expect(screen.getByText('doz')).toBeInTheDocument();
});
it('should render custom item components', async () => {
const itemToElement = jest.fn((item) => {
return <div className="mock-item">{item.label}</div>;
});
render(<Dropdown itemToElement={itemToElement} {...mockProps} />);
await openMenu();
expect(itemToElement).toHaveBeenCalled();
});
it('should render selectedItem as an element', () => {
render(
<Dropdown
{...mockProps}
selectedItem={{
id: `id-1`,
label: `Item 1`,
value: 1,
}}
renderSelectedItem={(selectedItem) => (
<div id="a-custom-element-for-selected-item">
{selectedItem.label}
</div>
)}
/>
);
// custom element should be rendered for the selected item
expect(
// eslint-disable-next-line testing-library/no-node-access
document.querySelector('#a-custom-element-for-selected-item')
).toBeDefined();
// the title should use the normal itemToString method
expect(screen.getByText('Item 1')).toBeInTheDocument();
});
describe('title', () => {
it('renders a title', () => {
render(<Dropdown {...mockProps} titleText="Email Input" />);
expect(screen.getByText('Email Input')).toBeInTheDocument();
});
it('has the expected classes', () => {
render(<Dropdown {...mockProps} titleText="Email Input" />);
expect(screen.getByText('Email Input')).toHaveClass(`${prefix}--label`);
});
});
describe('helper', () => {
it('renders a helper', () => {
render(<Dropdown helperText="Email Input" {...mockProps} />);
expect(screen.getByText('Email Input')).toBeInTheDocument();
});
it('renders children as expected', () => {
render(
<Dropdown
helperText={
<span>
This helper text has <a href="/">a link</a>.
</span>
}
{...mockProps}
/>
);
expect(screen.getByRole('link')).toBeInTheDocument();
});
});
it('should let the user select an option by clicking on the option node', async () => {
render(<Dropdown {...mockProps} />);
await openMenu();
await userEvent.click(screen.getByText('Item 0'));
expect(mockProps.onChange).toHaveBeenCalledTimes(1);
expect(mockProps.onChange).toHaveBeenCalledWith({
selectedItem: mockProps.items[0],
});
assertMenuClosed();
mockProps.onChange.mockClear();
await openMenu();
await userEvent.click(screen.getByText('Item 1'));
expect(mockProps.onChange).toHaveBeenCalledTimes(1);
expect(mockProps.onChange).toHaveBeenCalledWith({
selectedItem: mockProps.items[1],
});
});
it('should respect readOnly prop', async () => {
render(<Dropdown {...mockProps} readOnly={true} />);
await openMenu(); // menu should not open
assertMenuClosed();
await openMenu(); // menu should not open
expect(screen.queryByText('Item 0')).not.toBeInTheDocument();
expect(mockProps.onChange).toHaveBeenCalledTimes(0);
assertMenuClosed();
mockProps.onChange.mockClear();
});
describe('should display initially selected item found in `initialSelectedItem`', () => {
it('using an object type for the `initialSelectedItem` prop', () => {
render(
<Dropdown {...mockProps} initialSelectedItem={mockProps.items[0]} />
);
expect(screen.getByText(mockProps.items[0].label)).toBeInTheDocument();
});
it('using a string type for the `initialSelectedItem` prop', () => {
// Replace the 'items' property in mockProps with a list of strings
mockProps = {
...mockProps,
items: ['1', '2', '3'],
};
render(
<Dropdown {...mockProps} initialSelectedItem={mockProps.items[1]} />
);
expect(screen.getByText(mockProps.items[1])).toBeInTheDocument();
});
});
describe('Component API', () => {
it('should accept a `ref` for the underlying button element', () => {
const ref = React.createRef();
render(<Dropdown {...mockProps} ref={ref} />);
expect(ref.current).toHaveAttribute('aria-haspopup', 'listbox');
});
it('should respect slug prop', () => {
const { container } = render(<Dropdown {...mockProps} slug={<Slug />} />);
expect(container.firstChild).toHaveClass(
`${prefix}--list-box__wrapper--slug`
);
});
});
});
describe('DropdownSkeleton', () => {
describe('Renders as expected', () => {
it('Has the expected classes', () => {
render(<DropdownSkeleton size="sm" />);
// eslint-disable-next-line testing-library/no-node-access
expect(document.querySelector(`${prefix}--skeleton`)).toBeDefined();
});
});
});