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Testing ImpersonationSession Security Validation in Maybe Finance

This test suite validates the ImpersonationSession model’s security and validation logic in the Maybe Finance application. It ensures proper access control and validation rules for user impersonation functionality.

Test Coverage Overview

The test suite provides comprehensive coverage of the ImpersonationSession model’s core security features.

Key areas tested include:

Super admin permission validation
Protection against impersonating super admin users
Prevention of self-impersonation

The tests verify critical edge cases and security boundaries for the impersonation system.

Implementation Analysis

The testing approach utilizes ActiveSupport::TestCase with Minitest assertions to validate model-level constraints. The implementation leverages Rails fixtures for test data and employs assert_raises to verify expected validation failures.

Testing patterns include:

Explicit permission checking
Negative test cases for security validation
User role verification

Technical Details

Testing tools and configuration:

Minitest framework
ActiveSupport::TestCase base class
Rails fixtures for test data
ActiveRecord validation testing
Exception handling verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices for Ruby on Rails applications.

Notable practices include:

Focused test cases with clear intentions
Proper separation of concerns
Comprehensive security validation
Effective use of fixtures
Clear test naming conventions

maybe-finance/maybe

test/models/impersonation_session_test.rb

            
require "test_helper"

class ImpersonationSessionTest < ActiveSupport::TestCase
  test "only super admin can impersonate" do
    regular_user = users(:family_member)

    assert_not regular_user.super_admin?

    assert_raises(ActiveRecord::RecordInvalid) do
      ImpersonationSession.create!(
        impersonator: regular_user,
        impersonated: users(:maybe_support_staff)
      )
    end
  end

  test "super admin cannot be impersonated" do
    super_admin = users(:maybe_support_staff)

    assert super_admin.super_admin?

    assert_raises(ActiveRecord::RecordInvalid) do
      ImpersonationSession.create!(
        impersonator: users(:family_member),
        impersonated: super_admin
      )
    end
  end

  test "impersonation session must have different impersonator and impersonated" do
    super_admin = users(:maybe_support_staff)

    assert_raises(ActiveRecord::RecordInvalid) do
      ImpersonationSession.create!(
        impersonator: super_admin,
        impersonated: super_admin
      )
    end
  end
end