Back to Repositories

Testing Grape Middleware Globals Environment Handling in ruby-grape/grape

This test suite validates the Grape::Middleware::Globals functionality, focusing on request environment handling and middleware processing in the Grape framework. It ensures proper initialization and management of global request objects and parameters.

Test Coverage Overview

The test suite provides comprehensive coverage of the Globals middleware component in Grape:

Basic middleware pass-through functionality
Environment variable initialization and management
Request object creation and storage
Headers and parameters handling

Implementation Analysis

The testing approach utilizes RSpec’s context-based organization to validate different aspects of the middleware:

Tests employ mocking with allow/receive patterns to control middleware behavior, and uses let blocks for setup. The implementation leverages RSpec’s expect syntax for assertions and context blocks for logical grouping of related tests.

Technical Details

Key technical components include:

RSpec as the testing framework
Rack test helpers for HTTP environment simulation
StringIO for input stream simulation
Mock objects for isolation testing
Grape::Env constants for environment key verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases with proper setup and teardown
Clear test descriptions that specify expected behavior
Efficient use of RSpec’s subject and let blocks
Proper separation of concerns in test organization
Consistent testing patterns across different scenarios

ruby-grape/grape

spec/grape/middleware/globals_spec.rb

            
# frozen_string_literal: true

describe Grape::Middleware::Globals do
  subject { described_class.new(blank_app) }

  before { allow(subject).to receive(:dup).and_return(subject) }

  let(:blank_app) { ->(_env) { [200, {}, 'Hi there.'] } }

  it 'calls through to the app' do
    expect(subject.call({})).to eq([200, {}, 'Hi there.'])
  end

  context 'environment' do
    it 'sets the grape.request environment' do
      subject.call({})
      expect(subject.env[Grape::Env::GRAPE_REQUEST]).to be_a(Grape::Request)
    end

    it 'sets the grape.request.headers environment' do
      subject.call({})
      expect(subject.env[Grape::Env::GRAPE_REQUEST_HEADERS]).to be_a(Hash)
    end

    it 'sets the grape.request.params environment' do
      subject.call(Rack::QUERY_STRING => 'test=1', Rack::RACK_INPUT => StringIO.new)
      expect(subject.env[Grape::Env::GRAPE_REQUEST_PARAMS]).to be_a(Hash)
    end
  end
end