Testing is one of the most important parts of software development and helps to ensure
bugs don’t get into production and that code can be refactored safely.
If you’re working on a team with multiple people with different skill sets,
you might have people doing testing who only know windows and development is only
using OSX or Linux. We want everyone to be able to test - someone in QA who is familiar
with Windows shouldn’t have to throw away all that knowledge, install Linux, and start from scratch.
Enter JRuby and John.
John is our tester and he is running windows. He wants to help make sure that when a user
http://google.com/ that a button appears with the text “Google Search”.
The quick way to do this is to open his browser, navigate to
glance through the page for the button and confirm that its there.
John has a problem though, he has 30 other test cases to run and the developers are pushing code to the frontpage
several times a day; John now has to continously do this manually everytime code is touched and
his test load is piling up.
So let’s help John out and install Sublime Text 2 and JRuby.
Start by downloading the 64-bit version of Sublime Text.
Make sure to add the context menu when going through the install process.
Now we’ll visit the JRuby homepage and download the 64 bit installer.
Go through the installer and let JRuby set your path so you can access ruby from
Now when we open
cmd.exe and type
jruby -v we’ll be able to see that it was installed.
Now that we have our tools installed lets setup our test directory on the Desktop.
testing folder we’ll create a folder called
TestDemo for our tests for the Demo project.
Next we’ll open Sublime Text and go to
File > Open Folder and navigate to our
TestDemo folder and hit open.
Now we can continue making our directory structure inside Sublime Text. Since we’re going to use
we need to create a folder called
spec to contain all of our tests. Right click on the
TestDemo in the
tree navigation and click
Call the folder
spec in the bottom title bar when it prompts you for the folder name.
Next we’ll create our Gemfile which will declare all of our dependencies - so make a file in the project root called
Gemfile and put the our dependencies in it:
Once we have that file created, open
cmd.exe and switch to your project’s root directory.
jgem install bundler to install
bundler which manages ruby dependencies.
While still at the command prompt we’re going to
bundle to install our dependencies:
After that finishes we need to run one last command for
selenium to work properly:
We also need a
spec_helper.rb file inside our
5Capybara.default_driver = :selenium
We’ve now setup our rspec folders, our Gemfile with dependencies, and installed them. Now we can write
the test that will save John a ton of time.
Chrome comes with a simple tool to get XPath paths so we’re going to use that to get the XPath
for the search button. Right click on the “Google Search” button and click
Right click on the highlighted element and hit
Now we’re going to make our spec file and call it
homepage_spec.rb and locate it under
Here is a picture showing the directory structure and files:
Here is the spec file with comments explaining each part:
1# This loads the spec helper file that we required everything in
4# This is the outer level description of the test
5# For this example it describes going to the homepage of Google.com
6# Setting the feature type is necessary if you have
7# Capybara specs outside of the spec\features folder
8describe "Going to google.com", :type => :feature do
10 # Context is like testing a specific component of the homepage, in this case
11 # its the search button
12 context "The search button" do
13 # This is our actual test where we give it a meaningful test description
14 it "should contain the text 'Google Search'" do
15 visit "http://google.com/" # Opens Firefox and visits google
16 button = find(:xpath, '//*[@id=gbqfba"') # find an object on the page by its XPath path
17 # This uses an rspec assertion saying that the string returned
18 # by button.text is equal to "Google Search"
19 button.text.should eq("Google Seearch")
Now we can tab back to our
cmd.exe prompt and run our tests!
rspec spec will run all your tests under the
Things to take note of
This example scenario is showing how to automate browser testing to do end-to-end tests on a product using rspec.
This is by no means everything you can do with rspec and ruby - you can SSH, hit APIs and parse JSON, and do anything
you want with the ability to make assertions.
A lot is going on in these examples - there are plenty of resources out there on google and other websites
that provide more rspec examples and ruby examples.
We also showed how to add dependencies and install them using
Two of the best resources for finding libraries and other gems is
RubyGems and Ruby-Toolbox - the only thing to take note of
is anything saying to be a native C extension (they won’t work with JRuby out of the box).
My last note is that you also need to have firefox installed as well - Selenium will work with Chrome but I’ve found it to be a
hassle to setup (and unless you really need Chrome), the default of Firefox will work great.