There are frameworks to test UIs. Selenium is a big one for the kind of e2e test you described.
Halp LLM
How do you test UI features? i.e. I click on the goban, and a stone appears
Write me a test in selenium that does this.
To test UI features like clicking on a goban (a board used in the game of Go) and having a stone appear, you can use Selenium, a popular tool for automating web browsers. Below is an example of how you might write a test in Python using Selenium to perform this action:
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.action_chains import ActionChains
import time
# Set up the WebDriver (make sure to have the appropriate driver installed, e.g., chromedriver)
driver = webdriver.Chrome()
try:
# Navigate to the page with the goban
driver.get("URL_OF_YOUR_GOBAN_PAGE")
# Locate the goban element (replace 'goban_selector' with the actual selector for the goban)
goban = driver.find_element(By.CSS_SELECTOR, "goban_selector")
# Perform a click action on the goban
actions = ActionChains(driver)
actions.click(goban).perform()
# Wait for a short period to allow the stone to appear
time.sleep(2)
# Verify that the stone has appeared (replace 'stone_selector' with the actual selector for the stone)
stone = driver.find_element(By.CSS_SELECTOR, "stone_selector")
assert stone.is_displayed(), "The stone did not appear on the goban."
finally:
# Close the browser
driver.quit()
Key Points:
- WebDriver Setup: Ensure you have the appropriate WebDriver installed (e.g.,
chromedriver for Chrome) and that it’s in your system’s PATH.
- Selectors: Replace
"goban_selector" and "stone_selector" with the actual CSS selectors or XPath expressions that identify the goban and stone elements on your page.
- Action Chains: Used to perform complex user interactions like clicking.
- Assertions: Check if the stone is displayed after the click action to verify the test’s success.
- Cleanup: Always close the browser with
driver.quit() to free up resources.
Make sure to adjust the selectors and URL to match your specific application’s HTML structure.
But for the “demonstrate a bug”/TDD use-case, unit tests are better. There are a lot of testing frameworks that look similar, but can simulate browser elements and can run faster than an e2e test.
Halp LLM
Great for e2e! Can you recommend a similar test for unit tests? You can use a different framework
For unit testing UI components, you typically want to isolate the component logic from the actual browser environment. This is often done using a JavaScript testing framework like Jest along with a testing utility like React Testing Library if you’re working with React, or similar tools for other frameworks.
Here’s an example of how you might write a unit test for a React component that represents a goban, using Jest and React Testing Library:
React Component Example
Let’s assume you have a simple React component for the goban:
// Goban.js
import React, { useState } from 'react';
const Goban = () => {
const [stone, setStone] = useState(false);
const handleClick = () => {
setStone(true);
};
return (
<div data-testid="goban" onClick={handleClick} style={{ width: '200px', height: '200px', border: '1px solid black' }}>
{stone && <div data-testid="stone" style={{ width: '20px', height: '20px', backgroundColor: 'black' }}></div>}
</div>
);
};
export default Goban;
Unit Test Example
Here’s how you might write a unit test for this component:
// Goban.test.js
import React from 'react';
import { render, fireEvent } from '@testing-library/react';
import '@testing-library/jest-dom/extend-expect';
import Goban from './Goban';
test('clicking on the goban places a stone', () => {
// Render the Goban component
const { getByTestId, queryByTestId } = render(<Goban />);
// Get the goban element
const goban = getByTestId('goban');
// Ensure the stone is not present initially
expect(queryByTestId('stone')).toBeNull();
// Simulate a click on the goban
fireEvent.click(goban);
// Verify that the stone appears
expect(getByTestId('stone')).toBeInTheDocument();
});
Key Points:
- React Testing Library: This library is used to render components and simulate user interactions in a way that closely resembles how users interact with your app.
- Jest: A popular testing framework for JavaScript, often used with React.
fireEvent: Used to simulate events like clicks.- Assertions: Use Jest’s
expect function to assert that the stone appears after the goban is clicked.
data-testid: A common pattern for selecting elements in tests without relying on CSS classes or IDs that might change.
This approach allows you to test the component’s behavior in isolation, ensuring that the logic for placing a stone works as expected without needing to run a full end-to-end test.
That’s still a little painful as it’s tied to the UI framework. Testing can actually help you improve your architecture by splitting stuff into into “View” and “Business logic”. So you might just write unit tests that test your GobanController (with no DOM/UI commands).
Halp LLM
Okay let’s ignore the UI for now. How would you test the underlying model/controller using Jest?
If you’re working with a model or controller in a JavaScript application and want to test it using Jest, you can focus on testing the core logic and functionality of these components. Let’s assume you have a simple model or controller that handles the logic for placing a stone on a goban.
Example Model/Controller
Here’s a basic example of a JavaScript class that represents the logic for placing a stone on a goban:
// gobanController.js
class GobanController {
constructor() {
this.stonePlaced = false;
}
placeStone() {
this.stonePlaced = true;
return "Stone placed on the goban.";
}
isStonePlaced() {
return this.stonePlaced;
}
}
module.exports = GobanController;
Unit Test Example
Here’s how you might write a unit test for this model/controller using Jest:
// gobanController.test.js
const GobanController = require('./gobanController');
describe('GobanController', () => {
let gobanController;
beforeEach(() => {
gobanController = new GobanController();
});
test('should not have a stone placed initially', () => {
expect(gobanController.isStonePlaced()).toBe(false);
});
test('should place a stone on the goban', () => {
const result = gobanController.placeStone();
expect(gobanController.isStonePlaced()).toBe(true);
expect(result).toBe("Stone placed on the goban.");
});
});
Key Points:
- Jest Framework: A popular testing framework for JavaScript, providing a simple API for writing tests.
describe Block: Used to group related tests together.beforeEach Hook: Sets up a fresh instance of GobanController before each test to ensure isolation.- Test Cases: Use
test or it to define individual test cases.
- Assertions: Use Jest’s
expect function to assert expected outcomes, such as checking the state of stonePlaced and the return value of placeStone.
This approach allows you to test the core logic of your model or controller, ensuring that the functionality works as expected without involving any UI components.
But this is another reason why CLIs rule - it’s much easier to test text IO than to test browser GUI elements 
