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Testing Grape API Shared Parameter Helpers in ruby-grape/grape

This test suite validates the shared helpers functionality in Grape API, specifically focusing on parameter definition and validation. The tests verify the proper implementation of shared parameter modules and their integration with API endpoints.

Test Coverage Overview

The test suite covers the core functionality of Grape::API::Helpers module, focusing on shared parameter definitions.

Key areas tested include:

Parameter module extension and inclusion
Optional pagination parameter validation
JSON response formatting
Parameter declaration handling

Implementation Analysis

The testing approach utilizes RSpec’s describe blocks to structure tests around the Grape::API::Helpers module. The implementation demonstrates the use of dynamic class creation and module extension to test shared parameter functionality.

Notable patterns include:

Module extension for shared parameters
Dynamic API class creation
Request-response cycle validation

Technical Details

Testing infrastructure includes:

RSpec testing framework
Grape API framework
JSON response formatting
HTTP request simulation
Response status and body validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby API development.

Key practices include:

Isolated test subject creation
Clear test case organization
Proper response validation
Dynamic test class generation
Modular parameter definition

ruby-grape/grape

spec/grape/api/shared_helpers_spec.rb

            
# frozen_string_literal: true

describe Grape::API::Helpers do
  subject do
    shared_params = Module.new do
      extend Grape::API::Helpers

      params :pagination do
        optional :page, type: Integer
        optional :size, type: Integer
      end
    end

    Class.new(Grape::API) do
      helpers shared_params
      format :json

      params do
        use :pagination
      end
      get do
        declared(params, include_missing: true)
      end
    end
  end

  def app
    subject
  end

  it 'defines parameters' do
    get '/'
    expect(last_response.status).to eq 200
    expect(last_response.body).to eq({ page: nil, size: nil }.to_json)
  end
end