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Testing Content Type Management Implementation in ruby-grape/grape

This test suite validates the content type handling functionality in the Grape framework, focusing on MIME type mappings and content type configuration. It ensures proper handling of default content types and custom content type settings for API responses.

Test Coverage Overview

The test suite provides comprehensive coverage of Grape’s content type management system:

Default content type mappings validation
MIME type reverse mapping verification
Content type resolution from settings
Custom content type handling

Implementation Analysis

The testing approach uses RSpec’s describe/context pattern to organize test cases logically. It leverages subject/let blocks for efficient test setup and employs frozen string literals for performance optimization. The tests verify both standard and edge cases for content type resolution.

Technical Details

Testing tools and configuration:

RSpec as the testing framework
Frozen string literals for immutability
Subject/let blocks for test setup
Hash comparison for content type verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Clear test organization using describe/context blocks
Consistent use of subject for test focus
Explicit context definitions for different scenarios
Efficient test data setup using let blocks

ruby-grape/grape

spec/grape/content_types_spec.rb

            
# frozen_string_literal: true

describe Grape::ContentTypes do
  describe 'DEFAULTS' do
    subject { described_class::DEFAULTS }

    let(:expected_value) do
      {
        xml: 'application/xml',
        serializable_hash: 'application/json',
        json: 'application/json',
        binary: 'application/octet-stream',
        txt: 'text/plain'
      }.freeze
    end

    it { is_expected.to eq(expected_value) }
  end

  describe 'MIME_TYPES' do
    subject { described_class::MIME_TYPES }

    let(:expected_value) do
      {
        'application/xml' => :xml,
        'application/json' => :json,
        'application/octet-stream' => :binary,
        'text/plain' => :txt
      }.freeze
    end

    it { is_expected.to eq(expected_value) }
  end

  describe '.content_types_for' do
    subject { described_class.content_types_for(from_settings) }

    context 'when from_settings is present' do
      let(:from_settings) { { a: :b } }

      it { is_expected.to eq(from_settings) }
    end

    context 'when from_settings is not present' do
      let(:from_settings) { nil }

      it { is_expected.to be(described_class::DEFAULTS) }
    end
  end

  describe '.mime_types_for' do
    subject { described_class.mime_types_for(from_settings) }

    context 'when from_settings is equal to Grape::ContentTypes::DEFAULTS' do
      let(:from_settings) do
        {
          xml: 'application/xml',
          serializable_hash: 'application/json',
          json: 'application/json',
          binary: 'application/octet-stream',
          txt: 'text/plain'
        }.freeze
      end

      it { is_expected.to be(described_class::MIME_TYPES) }
    end

    context 'when from_settings is not equal to Grape::ContentTypes::DEFAULTS' do
      let(:from_settings) do
        {
          xml: 'application/xml;charset=utf-8'
        }
      end

      it { is_expected.to eq('application/xml' => :xml) }
    end
  end
end