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Testing Deprecation Handling Implementation in VCR

This test suite validates deprecation handling in the VCR library, focusing on configuration methods, constant access, and middleware functionality. It ensures proper warning messages and backward compatibility for deprecated features.

Test Coverage Overview

The test suite provides comprehensive coverage of VCR’s deprecation mechanisms across multiple components:

Configuration method deprecations (.config and stub_with)
Deprecated constant access (VCR::Config)
ERB variable error handling
Faraday middleware deprecation warnings

Implementation Analysis

The testing approach uses RSpec’s expectation and mocking framework to verify deprecation warnings and functionality:

Mock objects to verify warning message delivery
Behavior verification of deprecated methods
Exception handling for undefined constants
Delegation pattern testing for replacement methods

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
Mocking with receive/expect patterns
Disabled warnings for controlled testing environment
Integration with VCR’s configuration system

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolation of deprecated features
Explicit warning message verification
Proper error handling validation
Comprehensive coverage of edge cases
Clear test organization by component

vcr/vcr

spec/lib/vcr/deprecations_spec.rb

            
require 'spec_helper'

RSpec.describe VCR, 'deprecations', :disable_warnings do
  describe ".config" do
    it 'delegates to VCR.configure' do
      expect(VCR).to receive(:configure)
      VCR.config { }
    end

    it 'yields the configuration object' do
      config_object = nil
      VCR.config { |c| config_object = c }
      expect(config_object).to be(VCR.configuration)
    end

    it 'prints a deprecation warning' do
      expect(VCR).to receive(:warn).with(/VCR.config.*deprecated/i)

      VCR.config { }
    end
  end

  describe "Config" do
    it 'returns the same object referenced by VCR.configuration' do
      expect(VCR::Config).to be(VCR.configuration)
    end

    it 'prints a deprecation warning' do
      expect(VCR).to receive(:warn).with(/VCR::Config.*deprecated/i)

      VCR::Config
    end

    it 'preserves the normal undefined constant behavior' do
      expect {
        VCR::SomeUndefinedConstant
      }.to raise_error(NameError)
    end
  end

  describe "Cassette::MissingERBVariableError" do
    it 'returns VCR::Errors::MissingERBVariableError' do
      expect(VCR::Cassette::MissingERBVariableError).to be(VCR::Errors::MissingERBVariableError)
    end

    it 'prints a deprecation warning' do
      expect(VCR::Cassette).to receive(:warn).with(/VCR::Cassette::MissingERBVariableError.*deprecated/i)

      VCR::Cassette::MissingERBVariableError
    end

    it 'preserves the normal undefined constant behavior' do
      expect {
        VCR::Cassette::SomeUndefinedConstant
      }.to raise_error(NameError)
    end
  end

  describe "VCR.configure { |c| c.stub_with ... }" do
    it 'delegates to #hook_into' do
      expect(VCR.configuration).to receive(:hook_into).with(:webmock, :excon)
      VCR.configure { |c| c.stub_with :webmock, :excon }
    end

    it 'prints a deprecation warning' do
      expect(VCR.configuration).to receive(:warn).with(/stub_with.*deprecated/i)
      VCR.configure { |c| c.stub_with :webmock, :excon }
    end
  end

  describe "VCR::Middleware::Faraday" do
    it 'prints a deprecation warning when passed a block' do
      expect(Kernel).to receive(:warn).with(/Passing a block .* is deprecated/)
      VCR::Middleware::Faraday.new(double) { }
    end
  end
end