question

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how to write unit test for (EF) Element Framework in react 18?

Hi there,

I want to write unit tests for my react components in typescript. I am using (EF) Element Framework. React 18 and @testing-library/react. Basically, the default set up for create-react app.

I can only test functions. I cannot test any of the functionality of the EF components.

e.g. the debug methods show this for the toggle component

<body>

<ef-tooltip

ref="title-override"

/>

<div>

<ef-toggle />

</div>

</body>

  1. How can I select elements?

const { container } = render(<CurrencyPairToggle value={value} callback={setState} />)

const toggle = container.querySelector('ef-toggle')

debug()

This code works, but I do not think this is the right way of doing this.

Normal search variants do not work. E.g. queryByText, queryByRole

  1. Can I even trigger an event for the components. E.g fireEvent.click for a toggle?
  2. At least how can I test if the label or the checkedLabel are populated with the right value?
    1. E.g. expect(screen.getByRole("switch")).toHaveAttribute("label", "USD")
    2. Note: toggle uses the role ‘switch’


Many thanks for your help

#technology#producttestingelement-frameworktypescript
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Upvotes
Accepted
21 0 1 1

Trying using the normal @testing-library/reac for elements like toggle.

If your component is more complex you might try to use the container property from render and trigger the event by using a createEvent from @testing-library/react, Check the dummy code:

import React from "react";

import { render, fireEvent, createEvent, waitFor } from "@testing-library/react";

import YourComponent from "./YourComponent";

const testData = [

{

label: "Spot",

value: "Spot",

selected: true,

},

{

label: "Tenor 2",

value: "Tenor 2",

},

];


describe("<YourComponent />", () => {

const setState = jest.fn();

it("should match with snapshot", () => {

render(<YourComponent data={testData} callback={setState} />);

expect(render(<YourComponent data={testData} callback={setState} />)).toMatchSnapshot();

});

it("should call the callback fn", async () => {

const callback = async (value: string) => {

await waitFor(() => {

expect(value).toEqual("Spot");

});

};

const { container } = render(<YourComponent data={testData} callback={callback} />);

const element = container.querySelector("ef-combo-box") as Element;

const event = createEvent(

"value-changed",

element as Element,

{

detail: { value: "Spot" },

},

{ EventType: "CustomEvent" },

);


fireEvent(element, event);

fireEvent.keyUp(element as Element, { key: "Enter", code: "Enter" });

});

});

Good luck!

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@ricardo.santana

Thanks for reaching out to us.

I found the sample EF test scripts on GitHub. They are in TypeScript.

You can refer to those sample test scripts.

I hope that this information is of help.


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Thanks for your help, but those tests are for the EF component,

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