Instant RSpec Test-Driven Development How-to by Charles Feduke

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By Charles Feduke

RSpec is a behaviour pushed improvement framework for Ruby programmers. It comes built-in with its personal mocking framework in keeping with Jmock. This ebook introduces you to RSpec supporting you to write down idiomatic necessities for Ruby code in a try out first approach.

Instant RSpec Test-Driven improvement How-to is full of examples of tangible code followed via reasons and covers basic Ruby, Rails, and RSpec use instances plus a number of the extra complex themes. RSpec try out pushed improvement is written at the premise that you will want no event with RSpec and restricted adventure with Ruby, Rails, and TDD basics. You’ll start by way of writing a very easy Ruby library in precise TDD style and and use the purple, eco-friendly, refactor instruments emigrate this library right into a Rails application.

Instant RSpec Test-Driven improvement How-to will educate you the particular steps played in writing an idiomatic specification. it is possible for you to to jot down a try for the code you would like you had, and discover ways to write basically the minimal code essential to move a try out, and write extra necessities to force out the creation performance your program will desire. in the course of the process the publication, you'll convert a Ruby software right into a new Rails program, try out Rails specifics reminiscent of dossier uploads, cookies, and version validation or even how one can use Capybara. RSpec try pushed improvement may also help you construct self belief within the code they you write and spend much less time facing insects and upkeep complications.

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Find(params[:id]) rescue ActiveRecord::RecordNotFound render :status => 404 end end 21. Next is the #index action beginning as always with a spec. 0) ] end #TODO check with let! before { locations } subject { get :index } it "assigns @locations" do subject # let! should eq(locations) end end end 22. erb 23. all end In the previous spec, there is an explicit before { location } block. If this was absent, the let statement for locations would not be executed as a part of the subject block and our spec would not pass.

What would happen if a negative value was passed for the mile radius in the near method? It would never return true for one, but we shouldn't pass that sort of value in the first place; Instead, we should signal back to the call site that a negative radius is never permitted. How to do it... 1. to raise_error ArgumentError end end 2. (lat, long, mile_radius) raise ArgumentError unless mile_radius >= 0 # remainder of method omitted end 3. Run rspec and verify that the specification now passes. There's more...

This is acceptable, although we end up essentially verifying the framework code, which isn't the real goal of TDD. But if you're not familiar with Rails routing, using tests to drive this configuration is a great way to arrive at a working implementation. 3. draw block): resources :locations, :except => [:edit, :update] 4. By default, resources will add all the routes that we tested for and exclude the ones that we marked as should_not be_routable. Run rspec again and you'll see everything pass, meaning that the routing configuration is good.

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