CSC/ECE 517 Fall 2015/E1573 sap

E1573 Unit Test for Assignment model

Assignment.rb is a model in Expertiza -a ruby rails application, that handles the various assignments assigned by the instructors to the teams during their coursework. The OSS project "Unit Test for Assignment model" tests the relationships, validation and scope of the assignment model using RSpec and Factory Girl.

Goals

• Write specs for major instance methods of assignment.rb model
• Create test data by writing factories and use the test data to test the model with rspec

Why is unit testing required

• Visibility and reporting
• Control and correction
• Efficiency and speed
• Planning and predictability
• Customer satisfaction

Factory Girl

Factory Girl is a fixture replacement which has easy-to-use definition syntax. <ref>http://www.rubydoc.info/gems/factory_girl/file/README.md</ref>factory_girl_rails provided Rails integration for Factory Girl. We define a factory to create objects which will be used for testing.

RSpec

RSpec is used for Test Driven Development. It is a Domain Specific Language, also called DSL, used specifically for Ruby Rails projects. It is used for describing the expected behavior of a system with executable examples. RSpec code is similar to Ruby code and it leverages Ruby features and syntax so as to make up a “mini-language” focused on the job of testing. It is commonly used for Unit Testing and Functional testing.<ref>https://www.youtube.com/watch?v=oFX1KPNRruA&feature=relmfu</ref>

Setting up Rspec and FactoryGirl

GemFile

Add the following lines of code in the gemfile:

source 'https://rubygems.org'

gem 'rspec-rails','~>3.0'
gem 'factory_girl-rails','~>4.0'

Preparing FactoryGirl

FactoryGirl is a Ruby Gem that mocks certain classes for automated tests. We will use FactoryGirl to mock nodes and lists.

Add the following lines of code to the RSpec config in spec/spec_helper.rb.

require 'factory_girl_rails'

RSpec.configure do |config|
  config.include FactoryGirl::Syntax::Methods
end

Building Factories

Each factory has a name and a set of attributes. Implicitly, the name of the factory corresponds to the the class, whose test objects are created by default, but it's possible to explicitly specify the class also.

This will create the objects of the User class:

      factory :user do
        sequence(:name) { |n| "NewName #{n}" }
        fullname {"test_user"}
        email {"sjolly@ncsu.edu"}
        parent_id =1
        is_new_user=true
      end

This will use the User class (Admin would have been created):

    factory :admin class: User do
       sequence(:name) { |n| "NewName #{n}" }
       fullname {"test_user"}
       email {"sjolly@ncsu.edu"}
       parent_id =1
       is_new_user=true
     end

It's possible to set up associations within factories. If the factory name is the same as the association name, the factory name can be left out, as given below :

Factory for Assignment having associations with instructor and wiki_type:

    factory :assignment_without_name, class: Assignment do
       name {}
       submitter_count {3}
       is_coding_assignment {true}
       microtask {true}
       review_assignment_strategy {'Auto-Selected'}
       association :instructor, factory: :user
       association :wiki_type, factory: :wiki_type 
    end

Creating specs

• Create a assignment_spec.rb file in spec/models folder

An example of a test case is

require 'spec_helper'

describe "Team_Assignment" do
   it "checks team assignment should be true" do
   assign=FactoryGirl.create(:assignment)
   res=assign.team_assignment
   expect(res).to be true
 end

Running RSpec

$ rspec spec/models/assignment_spec.rb 

You should be able to run tests successfully and see the following message:

Finished in 1.11 seconds (files took 14.47 seconds to load)
14 examples, 0 failures

References

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