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Testing Method Proxy Implementation in Faraday HTTP Client

This test suite validates core functionality of the Faraday HTTP client library, focusing on version verification and method proxying capabilities. It ensures proper connection handling and method delegation through comprehensive unit tests.

Test Coverage Overview

The test suite provides essential coverage for Faraday’s version management and method proxying system.

Key areas tested include:

Version number validation
Default connection proxy functionality
Method delegation behavior
Error handling for undefined methods

Implementation Analysis

The testing approach utilizes RSpec’s context-based structure with mock objects to isolate connection behavior. It implements before/after hooks for connection management and leverages doubles for dependency isolation.

Key patterns include:

Mock object injection for connection testing
Dynamic method proxying verification
Version-specific error message handling

Technical Details

Testing infrastructure includes:

RSpec testing framework
Double mocking for connection simulation
Ruby version-specific conditional logic
Method reflection capabilities
Dynamic method delegation testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices including proper test isolation, comprehensive error case coverage, and clean setup/teardown patterns.

Notable practices include:

Isolated test contexts
Proper mock object cleanup
Version-aware error handling
Clear test case organization

lostisland/faraday

spec/faraday_spec.rb

            
# frozen_string_literal: true

RSpec.describe Faraday do
  it 'has a version number' do
    expect(Faraday::VERSION).not_to be nil
  end

  context 'proxies to default_connection' do
    let(:mock_connection) { double('Connection') }
    before do
      Faraday.default_connection = mock_connection
    end

    it 'proxies methods that exist on the default_connection' do
      expect(mock_connection).to receive(:this_should_be_proxied)

      Faraday.this_should_be_proxied
    end

    it 'uses method_missing on Faraday if there is no proxyable method' do
      expected_message =
        if RUBY_VERSION >= '3.4'
          "undefined method 'this_method_does_not_exist' for module Faraday"
        elsif RUBY_VERSION >= '3.3'
          "undefined method `this_method_does_not_exist' for module Faraday"
        else
          "undefined method `this_method_does_not_exist' for Faraday:Module"
        end

      expect { Faraday.this_method_does_not_exist }.to raise_error(NoMethodError, expected_message)
    end

    it 'proxied methods can be accessed' do
      allow(mock_connection).to receive(:this_should_be_proxied)

      expect(Faraday.method(:this_should_be_proxied)).to be_a(Method)
    end

    after do
      Faraday.default_connection = nil
    end
  end
end