Not able to figure out where I’m going wrong
import React, { useState } from 'react';
const ColorPickerComponent = () => {
// State to hold the default background color
const [defaultBGColor, setDefaultBGColor] = useState('#ffffff'); // Default to white
// Function to handle the color change
const handleBGColorChange = (e) => {
console.log(e.target.value); // Log the new color value
setDefaultBGColor(e.target.value); // Update the state with the new color
};
return (
<div style={{ backgroundColor: defaultBGColor, padding: '20px' }}>
<h1>Pick a Background Color</h1>
<input
type="color"
id="colorPicker1"
name="colorPicker1"
value={defaultBGColor}
onChange={handleBGColorChange}
/>
<p>Current Color: {defaultBGColor}</p>
</div>
);
};
export default ColorPickerComponent;
describe('Color Picker Component Test', () => {
beforeEach(() => {
// Visit the page where the ColorPickerComponent is rendered
cy.visit('localhost:3000/'); // Replace with your actual page URL
});
it('should change the background color when a new color is selected', () => {
// Define the new color value you want to set
const newColor = '#ff5733'; // Example: a shade of orange
// Get the color input and change its value
cy.get('#colorPicker1')
.invoke('val', newColor) // Set the new color value
.trigger('change'); // Trigger the change event
// Assert that the input value has changed
cy.get('#colorPicker1').should('have.value', newColor);
// Assert that the background color of the div has changed
cy.get('div') // Select the div that has the background color
.should('have.css', 'background-color')
.and('match', /rgba?(255, 87, 51/); // Match the RGB value for the new color
});
it('should log the new color value to the console', () => {
// Spy on the console.log function
cy.window().then((win) => {
cy.stub(win.console, 'log').as('consoleLog'); // Alias the console.log
// Define the new color value you want to set
const newColor = '#ff5733'; // Example: a shade of orange
// Get the color input and change its value
cy.get('#colorPicker1')
.invoke('val', newColor) // Set the new color value
.trigger('change'); // Trigger the change event
// Assert that console.log was called with the new color value
cy.get('@consoleLog').should('have.been.calledWith', newColor);
});
});
});
Getting this error.
assertexpected [ <div#root>, 1 more… ] to have CSS property background-color with the value rgba(255, 87, 51), but the value was rgba(0, 0, 0, 0)
at this line
cy.get(‘div’).should(‘have.css’, ‘background-color’,’rgba(255, 87, 51)’)
2
Answers
The base problem is React uses synthetic events and
.trigger('change')
is not firing the event handler in the React component.The full discussion and a workaround is available here Testing Synthetic Events in Cypress.
Using Ryan’s custom command, you can replicate the user’s actions.
Test
When you’re unable to pass a Cypress test, it could be due to several reasons, ranging from incorrect test syntax to issues with the application under test. Here’s a step-by-step guide to troubleshoot and resolve common issues:
Syntax Errors: Review your test code for any syntax issues.
Assertions: Ensure your assertions correctly reflect the expected outcome. For example, cy.get(‘.element’).should(‘have.text’, ‘Expected Text’).
Use .debug(): Insert cy.debug() in your test to pause execution and inspect the current state.
Use .then(): Chain a .then() to inspect variables or elements.
Cypress Pause: Use cy.pause() to halt the test and allow manual inspection.
Ensure Correct Selectors: Verify that your selectors are accurate and that the element is available when Cypress tries to interact with it.
Wait for Elements: If an element appears after some delay, use cy.wait() or cy.get(‘.element’, { timeout: 10000 }).
Reset State: Ensure the application is in a consistent state before each test. Use hooks like beforeEach() to reset the state.
Mock Data: Use Cypress’s fixture or intercept commands to control the data returned by API requests.
Stub Network Requests: Use cy.intercept() to stub network responses, ensuring consistent and controlled results.
Handle Delays: If the application relies on slow network requests, consider stubbing or increasing timeout settings.
Element Not Visible: Ensure the element is visible. Use cy.scrollIntoView() if needed, or check if CSS issues are hiding elements.
Force Clicks: If an element is visible but still not clickable, use { force: true } in commands like cy.click({ force: true }).
Test Across Browsers: Run tests in different browsers supported by Cypress to see if the issue is browser-specific.
Check Environment Variables: Ensure your environment variables are correctly set up, especially if your test behavior depends on them.
Cypress Config: Review cypress.json or environment-specific configurations for any misconfigurations.
Cypress Dashboard: If you have Cypress Dashboard enabled, review the detailed logs and screenshots/videos of failed tests.
Console Logs: Check the browser console logs for errors or warnings that might not be obvious from the test output alone.
Flaky Tests: If the test fails intermittently, it may be flaky. Try re-running it to see if the failure persists. If so, investigate conditions under which it fails.