Protractor: Testing window scroll behavior

Testing window scroll behavior in Protractor can be useful to verify that certain elements become visible or hidden as the user scrolls down or up the page. To achieve this, you can use Protractor's browser.executeScript() method to simulate scrolling and then use Protractor's built-in expect() statements to make assertions based on the scroll behavior.

Here's a step-by-step guide on how to test window scroll behavior in Protractor:

Step 1: Set up Protractor Make sure you have Protractor installed and set up in your project. You can install Protractor globally using npm:

bashCopy code
npm install -g protractor

Step 2: Write the Test Case In your Protractor test file (e.g., scrollBehavior.spec.js), you can write the test case to test window scroll behavior.

For example, let's say you have a webpage with a list of items and you want to verify that new items are loaded as the user scrolls down the page. Your test case might look like this:

javascriptCopy code
describe('Testing window scroll behavior', function() {
  it('should load new items as user scrolls down the page', function() {
    browser.get('https://example.com/your-page');

    // Initial count of visible items
    let initialItemCount = 0;

    // Get the count of visible items before scrolling
    element.all(by.css('.item')).count().then(function(count) {
      initialItemCount = count;
    });

    // Simulate scrolling down the page
    browser.executeScript('window.scrollTo(0, document.body.scrollHeight);').then(function() {
      // Wait for some time to allow new items to load (if any)
      browser.sleep(2000);

      // Get the count of visible items after scrolling
      element.all(by.css('.item')).count().then(function(newCount) {
        // Assert that new items are loaded
        expect(newCount).toBeGreaterThan(initialItemCount);
      });
    });
  });
});

In this example, we use browser.executeScript() to simulate scrolling to the bottom of the page using JavaScript's window.scrollTo() function. After scrolling, we wait for some time to allow new items to load (you can adjust the sleep time based on your application's behavior). Finally, we use the expect() statement to assert that the count of visible items after scrolling is greater than the initial count.

Step 3: Run the Test To run the Protractor test, use the protractor command followed by the path to your test file:

bashCopy code
protractor path/to/scrollBehavior.spec.js

Protractor will launch the browser, execute the test, and display the test results.

Note: Make sure to replace https://example.com/your-page with the URL of your actual page being tested, and adjust the element locators (by.css()) to match your application's specific elements.

Keep in mind that this test example assumes that the new items are loaded dynamically as the user scrolls down the page. If your use case is different, you may need to modify the test case accordingly.