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Testing HTTP Header Processing Implementation in HTTParty

This test suite examines the HTTParty::HeadersProcessor class, focusing on header manipulation and processing in HTTP requests. It validates various header configurations including global headers, request-specific headers, and dynamic header generation.

Test Coverage Overview

The test suite provides comprehensive coverage of HTTParty’s header processing functionality.

Key areas tested include:

Empty header scenarios
Global header handling
Request-specific header processing
Header merging logic
Dynamic header generation

Implementation Analysis

The testing approach uses RSpec’s context-based structure to isolate different header scenarios. Implementation leverages let blocks for setup and subject definition, with before hooks handling processor initialization. The tests demonstrate both static and lambda-based dynamic header processing patterns.

Technical Details

Testing tools and configuration:

RSpec as the testing framework
Subject/let patterns for test setup
Expectation matchers for hash comparison
Lambda functions for dynamic header generation
Before hooks for test initialization

Best Practices Demonstrated

The test suite exemplifies several testing best practices including clear context separation, descriptive test names, and proper setup isolation. Each test case focuses on a specific header processing scenario, with well-structured expectations and appropriate use of RSpec’s DSL features for maintainable and readable tests.

jnunemaker/httparty

spec/httparty/headers_processor_spec.rb

            
require 'spec_helper'

RSpec.describe HTTParty::HeadersProcessor do
  subject(:headers) { options[:headers] }
  let(:options) { { headers: {} } }
  let(:global_headers) { {} }

  before { described_class.new(global_headers, options).call }

  context 'when headers are not set at all' do
    it 'returns empty hash' do
      expect(headers).to eq({})
    end
  end

  context 'when only global headers are set' do
    let(:global_headers) { { accept: 'text/html' } }

    it 'returns stringified global headers' do
      expect(headers).to eq('accept' => 'text/html')
    end
  end

  context 'when only request specific headers are set' do
    let(:options) { { headers: {accept: 'text/html' } } }

    it 'returns stringified request specific headers' do
      expect(headers).to eq('accept' => 'text/html')
    end
  end

  context 'when global and request specific headers are set' do
    let(:global_headers) { { 'x-version' => '123' } }

    let(:options) { { headers: { accept: 'text/html' } } }

    it 'returns merged global and request specific headers' do
      expect(headers).to eq('accept' => 'text/html', 'x-version' => '123')
    end
  end

  context 'when headers are dynamic' do
    let(:global_headers) { {'x-version' => -> { 'abc'.reverse } } }

    let(:options) do
      { body: '123',
        headers: { sum: lambda { |options| options[:body].chars.map(&:to_i).inject(:+) } } }
    end

    it 'returns processed global and request specific headers' do
      expect(headers).to eq('sum' => 6, 'x-version' => 'cba')
    end
  end
end