Developing end-to-end tests utilizing the selenium-webdriver library with WebDriverJS for node.js applications

I am currently in the process of migrating tests from webdriver and Java to webdriverjs, and I have a question regarding the functionality. Can someone help me understand why this code snippet works?

driver.get('http://www.google.com');
driver.findElement(webdriver.By.name('q')).sendKeys('webdriver');
driver.findElement(webdriver.By.name('btnG')).click();
driver.wait(function() {
  return driver.getTitle().then(function(title) {
    return assert.equal(title, 'webdriver - Google Search');
  });
}, 2000);

The variable 'title' indeed contains 'webdriver - Google Search'

On the other hand, this version fails:

driver.get('http://www.google.com');
driver.findElement(webdriver.By.name('q')).sendKeys('webdriver');
driver.findElement(webdriver.By.name('btnG')).click();
driver.wait(function() {
  driver.getTitle().then(function(title) {
    assert.equal(title, 'webdriver - Google Search');
  });
}, 2000);

In this case, the 'title' variable captures the title of the homepage instead of the search results page.

Thank you!

Answer №1

In order for the wait method to function properly, the function must return either a boolean value or a promise that resolves to a boolean. For instance, in the first scenario where you are returning an assert (a boolean), the subsequent then call converts it into a promise that resolves to a boolean which is then returned to the wait function, enabling it to work correctly. Conversely, in the second scenario where your function does not return anything, wait interprets this as an immediate successful resolution, meaning it does not actually wait at all.

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