How would you do an integration test for a ruby project

Ruby on Rails
1

I am trying to write tests for a ruby project.

I am struggling to start it. With Rails I can do an integration test to say click this button and then expect something.

Can I do something similar in ruby?

As in I want to be able to write the code and then start to make it work, or is it better to write out how I would do the commands on some paper and then test them?

for example I write all of this which none if it exists:

Product.brands.each do |brand|
  images = Product.images(brand, "image1")
  images.each do |image|
    file = FileProcessor.new(image)
  end
end

Thanks,

2

How will this code be run? From the command line?

3

Hi Andy,

Yes it will.

4

Ok. Start by thinking about the test phases. Using RSpec as an example, the rough outline might be:

describe "My command" do
  it "..." do
    # setup
    # execute
    # verify
    # teardown
  end
end

You could then implement each phase as a method within the spec:

create_sample_data
run_command
verify_images_were_processed
clean_up_any_generated_files_and_db_records

create_sample_data

This would likely be a few ActiveRecord create! calls to get your data in the necessary state.

run_command

To run the command from within the test, you can call the shell command using the Ruby’s exec method.

verify_images_were_processed

Using Ruby’s file manipulation support, you could check that particular files exist, their sizes, extensions, etc. For example: expect(File.exist?("foo/bar.jpg")).to be(true)

clean_up_any_generated_files_and_db_records

The test should clean up after itself. (In Rails this is usually handled by wrapping everything in a transaction, or by the database_cleaner gem).

Hope this starts you off in the right direction.

You might also want to look at Aruba.