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Testing HTML Content Cleaning Filter in DevDocs

This test suite validates the CleanTextFilter functionality in the DevDocs documentation system, focusing on HTML content cleaning and normalization. The tests ensure proper handling of empty nodes, whitespace management, and preservation of specific HTML elements.

Test Coverage Overview

The test suite provides comprehensive coverage of the CleanTextFilter’s core functionality.

Key areas tested include:

Empty node removal from HTML structures
Preservation of specific empty elements (iframe, td, th)
Whitespace handling and normalization

Integration points focus on HTML DOM manipulation and string processing capabilities.

Implementation Analysis

The testing approach utilizes Minitest’s spec-style syntax with the FilterTestHelper module for shared functionality. The implementation follows a behavior-driven pattern, clearly separating test cases for different aspects of text cleaning.

Framework features leverage Minitest’s assertion methods and custom helper methods for filter processing.

Technical Details

Testing tools and setup:

Minitest as the testing framework
FilterTestHelper module for common filter operations
Custom filter_output method for processing
Relative path requirements for test dependencies

Best Practices Demonstrated

The test suite demonstrates strong testing practices through focused, atomic test cases that verify specific behaviors. Each test case clearly states its purpose and expected outcome.

Notable practices include:

Isolated test scenarios
Clear test naming conventions
Effective use of setup and helper methods
Comprehensive edge case coverage

freecodecamp/devdocs

test/lib/docs/filters/core/clean_text_test.rb

            
require_relative '../../../../test_helper'
require_relative '../../../../../lib/docs'

class CleanTextFilterTest < Minitest::Spec
  include FilterTestHelper
  self.filter_class = Docs::CleanTextFilter

  it "removes empty nodes" do
    @body = "<div class=\"test\"><p data><span> \u00A0</span>\n\r<a></a></p></div>"
    assert_empty filter_output
  end

  it "doesn't remove empty <iframe>, <td>, and <th>" do
    @body = "<iframe></iframe><td></td><th></th>"
    assert_equal @body, filter_output
  end

  it "strips leading and trailing whitespace" do
    @body = "\n\r Test \r\n"
    assert_equal 'Test', filter_output
  end
end