Commit 407a8004 authored by Michael Kozono's avatar Michael Kozono Committed by Stan Hu

Add Capybara debugging methods to docs

parent c4ccd776
...@@ -63,6 +63,8 @@ writing one](testing_levels.md#consider-not-writing-a-system-test)! ...@@ -63,6 +63,8 @@ writing one](testing_levels.md#consider-not-writing-a-system-test)!
Sometimes you may need to debug Capybara tests by observing browser behavior. Sometimes you may need to debug Capybara tests by observing browser behavior.
#### Live debug
You can pause Capybara and view the website on the browser by using the You can pause Capybara and view the website on the browser by using the
`live_debug` method in your spec. The current page will be automatically opened `live_debug` method in your spec. The current page will be automatically opened
in your default browser. in your default browser.
...@@ -90,6 +92,35 @@ Finished in 34.51 seconds (files took 0.76702 seconds to load) ...@@ -90,6 +92,35 @@ Finished in 34.51 seconds (files took 0.76702 seconds to load)
Note: `live_debug` only works on javascript enabled specs. Note: `live_debug` only works on javascript enabled specs.
#### Run `:js` spec in a visible browser
Run the spec with `CHROME_HEADLESS=0`, e.g.:
```
CHROME_HEADLESS=0 bundle exec rspec some_spec.rb
```
The test will go by quickly, but this will give you an idea of what's happening.
You can also add `byebug` or `binding.pry` to pause execution and step through
the test.
#### Screenshots
We use the `capybara-screenshot` gem to automatically take a screenshot on
failure. In CI you can download these files as job artifacts.
Also, you can manually take screenshots at any point in a test by adding the
methods below. Be sure to remove them when they are no longer needed! See
https://github.com/mattheworiordan/capybara-screenshot#manual-screenshots for
more.
Add `screenshot_and_save_page` in a `:js` spec to screenshot what Capybara
"sees", and save the page source.
Add `screenshot_and_open_image` in a `:js` spec to screenshot what Capybara
"sees", and automatically open the image.
### Fast unit tests ### Fast unit tests
Some classes are well-isolated from Rails and you should be able to test them Some classes are well-isolated from Rails and you should be able to test them
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