Back to Repositories

Testing Path Recognition and Route Parameter Handling in Grape

This test suite validates the path recognition functionality in Grape API, focusing on route parameter handling and endpoint matching. It ensures proper routing behavior for both static and parametrized paths with type constraints.

Test Coverage Overview

The test suite comprehensively covers Grape API’s path recognition capabilities:

Basic path matching for multiple endpoints
Handling of non-matching paths
Complex nested resource routing
Type-constrained parameter validation
Static vs parametrized route resolution

Implementation Analysis

The testing approach utilizes RSpec’s behavior-driven development patterns with nested describe blocks and context-specific scenarios. It employs dynamic class creation through Class.new to isolate test cases and leverages Grape’s DSL for route definition.

The tests systematically verify route recognition through the recognize_path method, comparing actual and expected route origins.

Technical Details

Testing tools and configuration:

RSpec as the testing framework
Grape API’s route recognition system
Dynamic subject definition for isolated testing
Route parameter type constraints (Integer)
Nested resource declarations

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test scenarios using subject blocks
Comprehensive edge case coverage
Clear test case organization
Explicit expectations and assertions
Proper separation of concerns between route types

ruby-grape/grape

spec/grape/api/recognize_path_spec.rb

            
# frozen_string_literal: true

describe Grape::API do
  describe '.recognize_path' do
    subject { Class.new(described_class) }

    it 'fetches endpoint by given path' do
      subject.get('/foo/:id') {}
      subject.get('/bar/:id') {}
      subject.get('/baz/:id') {}

      actual = subject.recognize_path('/bar/1234').routes[0].origin
      expect(actual).to eq('/bar/:id')
    end

    it 'returns nil if given path does not match with registered routes' do
      subject.get {}
      expect(subject.recognize_path('/bar/1234')).to be_nil
    end

    context 'when parametrized route with type specified together with a static route' do
      subject do
        Class.new(described_class) do
          resource :books do
            route_param :id, type: Integer do
              get do
              end

              resource :loans do
                route_param :loan_id, type: Integer do
                  get do
                  end
                end

                resource :print do
                  post do
                  end
                end
              end
            end

            resource :share do
              post do
              end
            end
          end
        end
      end

      it 'recognizes the static route when the parameter does not match with the specified type' do
        actual = subject.recognize_path('/books/share').routes[0].origin
        expect(actual).to eq('/books/share')
      end

      it 'does not recognize any endpoint when there is not other endpoint that matches with the requested path' do
        actual = subject.recognize_path('/books/other')
        expect(actual).to be_nil
      end

      it 'recognizes the parametrized route when the parameter matches with the specified type' do
        actual = subject.recognize_path('/books/1').routes[0].origin
        expect(actual).to eq('/books/:id')
      end

      it 'recognizes the static nested route when the parameter does not match with the specified type' do
        actual = subject.recognize_path('/books/1/loans/print').routes[0].origin
        expect(actual).to eq('/books/:id/loans/print')
      end

      it 'recognizes the nested parametrized route when the parameter matches with the specified type' do
        actual = subject.recognize_path('/books/1/loans/33').routes[0].origin
        expect(actual).to eq('/books/:id/loans/:loan_id')
      end
    end
  end
end