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Testing Unsupported Group Type Exception Handling in ruby-grape/grape

This test suite validates the handling of unsupported group types in the Grape framework, focusing on exception behavior and deprecated class handling. The tests ensure proper error messaging and backward compatibility for group type validation.

Test Coverage Overview

The test suite covers the UnsupportedGroupType exception class in Grape, verifying both its current implementation and deprecated functionality.

Tests error message content for unsupported group types
Validates the deprecation of UnsupportedGroupTypeError class
Ensures proper error messaging for Array, Hash, JSON and Array[JSON] types

Implementation Analysis

The testing approach uses RSpec’s describe and context blocks to organize test cases logically. The implementation leverages subject blocks for testing instance methods and shared examples for testing deprecated class behavior.

The tests utilize RSpec’s expectation syntax and shared example patterns to maintain DRY principles across the test suite.

Technical Details

Testing Framework: RSpec
Shared Examples: Used for deprecated class testing
Test Environment: Frozen string literals enabled
Key Dependencies: Grape framework, shared deprecated class examples

Best Practices Demonstrated

The test suite demonstrates several testing best practices including proper isolation of test cases and clear organization of related tests.

Use of subject blocks for cleaner test syntax
Implementation of shared examples for reusable test cases
Clear separation of current and deprecated functionality testing
Consistent use of RSpec’s expectation syntax

ruby-grape/grape

spec/grape/exceptions/unsupported_group_type_spec.rb

            
# frozen_string_literal: true

require 'shared/deprecated_class_examples'

RSpec.describe Grape::Exceptions::UnsupportedGroupType do
  subject { described_class.new }

  describe '#message' do
    subject { described_class.new.message }

    it { is_expected.to include 'group type must be Array, Hash, JSON or Array[JSON]' }
  end

  describe 'Grape::Exceptions::UnsupportedGroupTypeError' do
    let(:deprecated_class) { Grape::Exceptions::UnsupportedGroupTypeError }

    it_behaves_like 'deprecated class'
  end
end