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Testing Boolean Parameter Validation in grape-ruby

This test suite validates boolean parameter handling in the Grape API framework, focusing on type validation and parameter processing. It ensures proper handling of boolean values passed through API endpoints and verifies the correct type assignment.

Test Coverage Overview

The test suite covers boolean parameter validation in Grape API routes with comprehensive checks for type handling and response processing.

Tests boolean parameter requirements in POST requests
Validates response status codes and body content
Verifies parameter type definitions in router configuration

Implementation Analysis

The testing approach uses RSpec to validate Grape’s Boolean type implementation through a sample API endpoint. It employs a class-based setup pattern with nested describe blocks to organize related test cases.

The implementation leverages Grape’s parameter definition DSL and router configuration to test both runtime behavior and static type definitions.

Technical Details

RSpec testing framework
Grape API framework
Rack test helpers for HTTP request simulation
Custom Boolean type implementation
POST endpoint configuration

Best Practices Demonstrated

The test suite demonstrates several testing best practices including isolation of test scenarios and clear context separation.

Proper use of RSpec context blocks
Clear test case isolation
Effective use of let blocks for setup
Explicit expectation definitions

ruby-grape/grape

spec/grape/api/defines_boolean_in_params_spec.rb

            
# frozen_string_literal: true

describe Grape::API::Instance do
  describe 'boolean constant' do
    let(:app) do
      Class.new(Grape::API) do
        params do
          requires :message, type: Grape::API::Boolean
        end
        post :echo do
          { class: params[:message].class.name, value: params[:message] }
        end
      end
    end

    let(:expected_body) do
      { class: 'TrueClass', value: true }.to_s
    end

    it 'sets Boolean as a type' do
      post '/echo?message=true'
      expect(last_response.status).to eq(201)
      expect(last_response.body).to eq expected_body
    end

    context 'Params endpoint type' do
      subject { app.new.router.map[Rack::POST].first.options[:params]['message'][:type] }

      it 'params type is a boolean' do
        expect(subject).to eq 'Grape::API::Boolean'
      end
    end
  end
end