How can we verify that the CSS styles are correctly applied to the specified HTML elements during testing (Unit/Integration)?

Question

How can we verify that the CSS styles are correctly applied to the specified HTML elements during testing (Unit/Integration)?

Currently, I am engaged in testing views using Cucumber and Rails, and so far, the experience has been very enjoyable. The following steps can easily be executed:

Background:
  Given I am logged in as a customer
Scenario: View the Welcome Page
  When I navigate to the home page
  Then I should land on the "Welcome" page
  And I should see the following elements in the sidebar:
    | selector                  | text                |
    | h3                        | Search              |
    | .home-page                | Home                |
    | .about-page               | About               |

However, I am now curious about going a step further with the command:

And I should observe the specific colors on the "Welcome" page:
  | selector                  | background          |
  | #content                  | white               |
  | #sidebar                  | grey                |
  | #navigation               | blue                |

I believe that achieving this may require tools like Node.js or other serverside javascript due to browser dependencies. Is it possible to accomplish this task using Selenium specifically in Safari and Firefox?

My objective is to primarily test colors and fonts, rather than layouts, given the challenges posed by cross-browser discrepancies. How could this be achieved? Perhaps through a combination of Jasmine and Cucumber?

Thank you!

Update

Credit goes to @idlefingers for providing a solution that works:

Tools used: Cucumber, Capybara.

features/support/env.rb:

Capybara.javascript_driver = :selenium

*features/step_definitions/css_steps.rb:*

Then /^I should view the color "([^"]+)" on the ([^"]+)$/ do |color, selector|
  element_color = page.evaluate_script('$("##{selector}").css("border-left-color");') # "rgb(221, 221, 221)"
  assert_equal color, some_color_conversion_method(element_color)
end

features/some.feature:

And I should view the color "red" on the sidebar

If there's a more effective approach, I would greatly appreciate any suggestions!

ruby-on-rails css tdd selenium

Answer 1

Answer №1

There are times when you need to ensure that an element on a webpage is displaying in a specific color. While tools like Jasmine can help with verification, it's often more reliable to conduct browser-based integration tests for accurate results. Developing such tests within Jasmine may require additional time and effort, resulting in less effective outcomes.

To simplify the process of interrogating elements for their colors, I created a handy jQuery plugin named Color Spy. By using this plugin, you can easily determine the background and text colors of any element by utilizing the following commands:

$(...).backgroundColor()
$(...).colorColor()

The plugin traverses through the DOM hierarchy to accurately calculate the color of an element.

If you want to incorporate this functionality into a selenium test, you'll need to:

Ensure that the Color Spy plugin is accessible either statically or dynamically loaded onto your page.
Create a custom test helper function called element_color(selector). This function will need to utilize JavaScript execution methods like get_eval for dynamic color assessment.
Utilize assert_equal for standard color comparison. Additionally, you can explore my jsutils repository for functions that assess visual similarity between colors.

I hope this information proves valuable for your testing needs.

Answer 2

There are times when you need to ensure that an element on a webpage is displaying in a specific color. While tools like Jasmine can help with verification, it's often more reliable to conduct browser-based integration tests for accurate results. Developing such tests within Jasmine may require additional time and effort, resulting in less effective outcomes.

To simplify the process of interrogating elements for their colors, I created a handy jQuery plugin named Color Spy. By using this plugin, you can easily determine the background and text colors of any element by utilizing the following commands:

$(...).backgroundColor()
$(...).colorColor()

The plugin traverses through the DOM hierarchy to accurately calculate the color of an element.

If you want to incorporate this functionality into a selenium test, you'll need to:

Ensure that the Color Spy plugin is accessible either statically or dynamically loaded onto your page.
Create a custom test helper function called element_color(selector). This function will need to utilize JavaScript execution methods like get_eval for dynamic color assessment.
Utilize assert_equal for standard color comparison. Additionally, you can explore my jsutils repository for functions that assess visual similarity between colors.

I hope this information proves valuable for your testing needs.

Answer 3

Answer №2

It's important to make sure the correct id or class is applied to an element, but checking its CSS directly seems unnecessary and risky. Small changes like adjusting the color shade could easily break your tests!

Additionally, focusing on testing behavior rather than implementation is key in utilizing Cucumber effectively. Check out this for some insightful points that align with how you're currently approaching testing.

If you still want to proceed with checking CSS values, one option is to execute JavaScript on the page to verify them. Selenium allows this through the use of get eval, while Capybara can achieve the same if the JS driver is functional.

Answer 4

It's important to make sure the correct id or class is applied to an element, but checking its CSS directly seems unnecessary and risky. Small changes like adjusting the color shade could easily break your tests!

Additionally, focusing on testing behavior rather than implementation is key in utilizing Cucumber effectively. Check out this for some insightful points that align with how you're currently approaching testing.

If you still want to proceed with checking CSS values, one option is to execute JavaScript on the page to verify them. Selenium allows this through the use of get eval, while Capybara can achieve the same if the JS driver is functional.

Answer 5

Answer №3

If you're looking to test the HTML body response, consider utilizing Webrat with Nokogiri integration:

Once integrated, you can proceed with the following code:

assert_have_selector "#content.white"

Answer 6

If you're looking to test the HTML body response, consider utilizing Webrat with Nokogiri integration:

Once integrated, you can proceed with the following code:

assert_have_selector "#content.white"

How can we verify that the CSS styles are correctly applied to the specified HTML elements during testing (Unit/Integration)?

Answer №1

Answer №2

Answer №3

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