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Testing Policy Scope Helper Implementation in Pundit

This test suite examines the functionality of Pundit’s Helper module, focusing on policy scope behavior in view contexts. The tests verify that policy scopes can be properly applied without affecting the controller’s policy scope tracking state.

Test Coverage Overview

The test suite provides targeted coverage of the Pundit::Helper module’s policy_scope functionality.

Key areas tested include:

Policy scope application in view contexts
Verification of policy scope state tracking
Interaction between view and controller policy scoping

Implementation Analysis

The testing approach uses RSpec’s describe/it blocks with let statements to establish the test context. The implementation leverages doubles for user and controller objects, demonstrating proper isolation of the helper functionality being tested.

Notable patterns include:

Mock object usage for dependencies
Controller-View relationship testing
State verification through expectation matching

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
Mock objects via RSpec doubles
Custom Controller and View test classes
Pundit helper module integration

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby and RSpec.

Notable practices include:

Proper test isolation using doubles
Clear context setup with let blocks
Focused test cases with single assertions
Explicit state verification

varvet/pundit

spec/pundit/helper_spec.rb

            
# frozen_string_literal: true

require "spec_helper"

RSpec.describe Pundit::Helper do
  let(:user) { double }
  let(:controller) { Controller.new(user, "update", double) }
  let(:view) { Controller::View.new(controller) }

  describe "#policy_scope" do
    it "doesn't flip pundit_policy_scoped?" do
      scoped = view.policy_scope(Post)

      expect(scoped).to be(Post.published)
      expect(controller).not_to be_pundit_policy_scoped
    end
  end
end