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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


  1. 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.

    Cypress.Commands.add('inputChange', (input, value) => {
      const nativeInputValueSetter = Object.getOwnPropertyDescriptor(
        window.HTMLInputElement.prototype,
        'value'
      ).set
    
      const changeInputValue = inputToChange => newValue => {
        nativeInputValueSetter.call(inputToChange[0], newValue)
        inputToChange[0].dispatchEvent(new Event('change', {
          newValue,
          bubbles: true
        }))
      }
    
      return cy.get(input).then(input => {
        changeInputValue(input)(value)
      })
    })
    

    Test

    cy.visit('http://localhost:3000/')
    
    const newColor = '#ff5733'; // Example: a shade of orange
    
    cy.inputChange('#colorPicker1', newColor)
    
    cy.get('#colorPicker1').should('have.value', newColor);
    
    // Get your div from the input's parent
    cy.get('#colorPicker1')
      .parent('div')
      .should('have.css', 'background-color', 'rgb(255, 87, 51)');
    

    enter image description here

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  2. 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:

    1. Check for Test Failures
      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’).
    2. Debugging with Cypress Commands
      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.
    3. Element Selection Issues
      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 }).
    4. Application State
      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.
    5. Network Issues
      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.
    6. Visibility Issues
      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 }).
    7. Cross-Browser Issues
      Test Across Browsers: Run tests in different browsers supported by Cypress to see if the issue is browser-specific.
    8. Environment Configurations
      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.
    9. Analyze Test Output
      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.
    10. Re-run Tests
      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.
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