controller_spec.rb

require "spec_helper"

describe ExampleController do
  context "GET #index" do
    let(:resources) { FactoryGirl.create_list(:resource) }

    before do
      get :index
    end

    it "responds successfully with an HTTP 200 status code" do
      expect(response).to be_success
      expect(response.code).to eq("200")
    end

    it "loads all of the resources" do
      expect(assigns(:resources)).to match_array(resources)
    end
  end

  context "POST #create" do
    let(:resource_params) { FactoryGirl.attributes_for(:resource) }

    before do
      post :create, resource: resource_params
    end

    it "should respond successfully with an HTTP 201 status code" do
      expect(response).to be_success
      expect(response.code).to eq("201")
    end
  end

  context "GET #show" do
    let!(:resource) { FactoryGirl.create(:resource) }

    before do
      get :show, id: resource.id
    end

    it "responds successfully with an HTTP 200 status code" do
      expect(response).to be_success
      expect(response.code).to eq("200")
    end
  end

  context "PATCH #update" do
    let!(:resource) { FactoryGirl.create(:resource) }
    let(:changes) { Faker::Lorem.words }

    before do
      patch :update, id: resource.id, resource: { example_attribute: changes }
    end

    it "responds successfully with an HTTP 204 status code" do
      expect(response).to be_success
      expect(response.code).to eq("204")
    end

    it "should have changed the resource's example attribute" do
      resource.reload
      expect(resource.example_attribute).to eq(changes)
    end
  end

  context "DELETE #destroy" do
    let!(:resource) { FactoryGirl.create(:resource) }
    let(:resource_id) { resource.id }

    before do
      delete :destroy, id: resource.id
    end

    it "responds successfully with an HTTP 204 status code" do
      expect(response).to be_success
      expect(response.code).to eq("204")
    end

    it "should destroy the resource" do
      expect { Resource.find(resource_id) }.to raise_error(ActiveRecord::RecordNotFound)
    end
  end
end

model_spec.rb

require "spec_helper"

describe Resource do
  it "should have a factory" do
    FactoryGirl.build(:resource).should be_valid
  end

  context "constants" do
    it "should create a range using the min and max" do
      expect(Resource::RANGE).to eq(Resource::MIN..Resource::MAX)
    end
  end

  context "validations" do
    it { should validate_presence_of(:example_attribute) }
    it { ensure_inclusion_of(:another_example_attribute).in_array(Resource::ExampleValues.constant_values).allow_blank }
  end

  context "associations" do
    it { should belong_to(:another_resource) }
    it { should have_one(:single_resource) }
    it { should have_many(:more_resources) }
  end

  context "scopes" do
    describe "#self.scoped" do
      let!(:not_scoped) { FactoryGirl.create(:resource) }
      let!(:scoped) { FactoryGirl.create(:resource, attribute_for_scope: true) }

      it "should include only scoped resources" do
        expect(Resource.scoped).to include(scoped)
        expect(Resource.scoped).to_not include(not_scoped)
      end
    end
  end
end