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Testing Theme Detection in 404 Pages in WPScan

This test suite validates WPScan’s theme detection functionality through analyzing URLs found in 404 error pages. It extends the existing URLsInHomepage functionality to specifically handle theme detection from error responses, providing an additional vector for WordPress theme enumeration.

Test Coverage Overview

The test suite focuses on the WPScan::Finders::Themes::UrlsIn404Page class, which inherits from URLsInHomepage to analyze theme-related URLs present in 404 error pages. Coverage includes:

Theme URL detection in error responses
Integration with WPScan’s target system
Error page response handling
Theme identifier extraction from URLs

Implementation Analysis

The testing approach leverages RSpec’s described_class pattern to isolate the UrlsIn404Page finder component. It implements inheritance-based testing by extending URLsInHomepage’s functionality, focusing on error_404_res instead of homepage_res for theme detection.

The implementation uses RSpec’s let blocks for dependency injection and fixtures for test data management.

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
Fixture-based test data management
WPScan’s Target class integration
HTTP response mocking capabilities
Custom fixtures directory structure for theme detection tests

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Clear separation of concerns through class inheritance
Efficient test setup using RSpec’s subject and let blocks
Organized fixture management
Focused test scope with clear inheritance relationship
DRY principles through test inheritance

wpscanteam/wpscan

spec/app/finders/themes/urls_in_404_page_spec.rb

            
# frozen_string_literal: true

describe WPScan::Finders::Themes::UrlsIn404Page do
  subject(:finder) { described_class.new(target) }
  let(:target)     { WPScan::Target.new(url) }
  let(:url)        { 'http://wp.lab/' }
  let(:fixtures)   { FINDERS_FIXTURES.join('themes', 'urls_in_404_page') }

  # This stuff is just a child class of URLsInHomepage (using the error_404_res rather than homepage_res)
  # which already has a spec
end