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Testing Optional Route Parameters Implementation in Grape API

This test suite evaluates the handling of optional parameters in route definitions for the Grape API framework. It specifically tests the functionality of optional URL segments and parameter extraction in GET and PUT requests within a namespaced API context.

Test Coverage Overview

The test suite provides comprehensive coverage of optional parameter handling in Grape API routes. It focuses on testing:

URL parameter extraction with optional segments
GET requests with and without optional extensions
PUT request parameter handling
Response status codes and body content validation

Implementation Analysis

The testing approach utilizes RSpec’s behavior-driven development patterns to validate Grape API’s route parameter functionality. The implementation leverages Grape’s DSL for defining routes with optional parameters using parenthetical notation (:id(/:ext)) and validates both the presence and absence of optional segments.

Technical Details

Key technical components include:

RSpec testing framework
Grape API class inheritance
Rack test helpers for HTTP request simulation
Dynamic class creation for isolated testing
Namespace scoping for API endpoints

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test contexts for different HTTP methods
Clear separation of setup and assertions
Consistent response validation patterns
Comprehensive edge case coverage
DRY test organization using shared setup

ruby-grape/grape

spec/grape/api/optional_parameters_in_route_spec.rb

            
# frozen_string_literal: true

describe Grape::Endpoint do
  subject { Class.new(Grape::API) }

  def app
    subject
  end

  before do
    subject.namespace :api do
      get ':id(/:ext)' do
        [params[:id], params[:ext]].compact.join('/')
      end

      put ':id' do
        params[:id]
      end
    end
  end

  context 'get' do
    it 'responds without ext' do
      get '/api/foo'
      expect(last_response.status).to eq 200
      expect(last_response.body).to eq 'foo'
    end

    it 'responds with ext' do
      get '/api/foo/bar'
      expect(last_response.status).to eq 200
      expect(last_response.body).to eq 'foo/bar'
    end
  end

  context 'put' do
    it 'responds' do
      put '/api/foo'
      expect(last_response.status).to eq 200
      expect(last_response.body).to eq 'foo'
    end
  end
end