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Testing Instrumentable Module Implementation in DevDocs

This test suite validates the Docs::Instrumentable module functionality in the DevDocs project, focusing on both extended and included implementation patterns. It ensures proper event subscription and instrumentation behavior across different usage scenarios.

Test Coverage Overview

The test coverage encompasses core instrumentation functionality verification for both class extension and instance inclusion patterns.

Tests class-level extension functionality
Validates instance-level inclusion behavior
Verifies event subscription and triggering
Ensures callback execution for both patterns

Implementation Analysis

The testing approach utilizes Minitest’s spec-style syntax to create isolated test environments for each instrumentation pattern. It leverages Ruby’s module inclusion mechanisms to test both class and instance-level functionality.

Uses anonymous class creation for isolation
Implements tap blocks for clean setup
Employs module extension patterns
Utilizes instance variable tracking for verification

Technical Details

Testing Framework: Minitest
Test Style: Spec
Setup Helpers: Class.new, tap blocks
Module Features: extend, include
Assertion Methods: assert
Test Environment: Isolated class instances

Best Practices Demonstrated

The test suite demonstrates several Ruby testing best practices, including proper isolation of test subjects and clear separation of concerns.

Clean test setup using let blocks
Isolated test environments
Clear test case separation
Minimal test dependencies
Focused test scenarios

freecodecamp/devdocs

test/lib/docs/core/instrumentable_test.rb

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

class DocsInstrumentableTest < Minitest::Spec
  let :extended_class do
    Class.new.tap { |klass| klass.send :extend, Docs::Instrumentable }
  end

  let :included_class do
    Class.new.tap { |klass| klass.send :include, Docs::Instrumentable }
  end

  it "works when extended" do
    extended_class.subscribe('test') { @called = true }
    extended_class.instrument 'test'
    assert @called
  end

  it "works when included" do
    instance = included_class.new
    instance.subscribe('test') { @called = true }
    instance.instrument 'test'
    assert @called
  end
end