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Testing Missing Option Exception Handling in grape

This test suite examines the error handling functionality in Grape’s MissingOption exception class. It specifically focuses on validating error messages when required options are not provided to the API framework. The tests ensure proper error communication for missing configuration parameters.

Test Coverage Overview

The test coverage focuses on the error messaging system for missing required options in Grape APIs.

Validates error message content for missing :path option
Ensures proper exception instantiation
Verifies error message formatting and clarity

Implementation Analysis

The testing approach utilizes RSpec’s describe/it blocks with let statements to establish test contexts. The implementation leverages RSpec’s expectation syntax to verify error message content through string inclusion checks. The test structure follows a behavior-driven development pattern focusing on the exception’s message method.

Technical Details

Testing Framework: RSpec
Test Subject: Grape::Exceptions::MissingOption class
Test Focus: #message method behavior
Error Handling: String content validation
Configuration: Uses frozen_string_literal pragma

Best Practices Demonstrated

The test suite demonstrates several testing best practices in Ruby.

Clear test organization using nested describe blocks
Efficient test setup using let blocks
Focused test cases with single responsibility
Descriptive test naming conventions
Proper exception testing patterns

ruby-grape/grape

spec/grape/exceptions/missing_option_spec.rb

            
# frozen_string_literal: true

describe Grape::Exceptions::MissingOption do
  describe '#message' do
    let(:error) do
      described_class.new(:path)
    end

    it 'contains the problem in the message' do
      expect(error.message).to include(
        'you must specify :path options'
      )
    end
  end
end