Adding user_certifications relation, and paperclip gem

test/fixtures/user_certifications.yml

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+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html
+
+one:
+  user_id: 1
+  certification_id: 1
+
+two:
+  user_id: 1
+  certification_id: 1

test/functional/user_certifications_controller_test.rb

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+require 'test_helper'
+
+class UserCertificationsControllerTest < ActionController::TestCase
+  setup do
+    @user_certification = user_certifications(:one)
+  end
+
+  test "should get index" do
+    get :index
+    assert_response :success
+    assert_not_nil assigns(:user_certifications)
+  end
+
+  test "should get new" do
+    get :new
+    assert_response :success
+  end
+
+  test "should create user_certification" do
+    assert_difference('UserCertification.count') do
+      post :create, :user_certification => { :certification_id => @user_certification.certification_id, :user_id => @user_certification.user_id }
+    end
+
+    assert_redirected_to user_certification_path(assigns(:user_certification))
+  end
+
+  test "should show user_certification" do
+    get :show, :id => @user_certification
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get :edit, :id => @user_certification
+    assert_response :success
+  end
+
+  test "should update user_certification" do
+    put :update, :id => @user_certification, :user_certification => { :certification_id => @user_certification.certification_id, :user_id => @user_certification.user_id }
+    assert_redirected_to user_certification_path(assigns(:user_certification))
+  end
+
+  test "should destroy user_certification" do
+    assert_difference('UserCertification.count', -1) do
+      delete :destroy, :id => @user_certification
+    end
+
+    assert_redirected_to user_certifications_path
+  end
+end

test/unit/helpers/user_certifications_helper_test.rb

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+require 'test_helper'
+
+class UserCertificationsHelperTest < ActionView::TestCase
+end

test/unit/user_certification_test.rb

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+require 'test_helper'
+
+class UserCertificationTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end