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Testing InvalidFormatter Exception Message Handling in grape

This test suite focuses on validating the error handling behavior of Grape’s InvalidFormatter exception class. It specifically examines how the framework handles cases where data type conversion to specified formats fails, ensuring proper error messaging for invalid format conversions.

Test Coverage Overview

The test coverage focuses on the error messaging functionality of Grape’s InvalidFormatter exception class. It verifies:

Error message generation for invalid format conversions
Proper handling of type-to-format conversion failures
String to XML conversion error scenarios

Implementation Analysis

The testing approach utilizes RSpec’s describe blocks to organize test cases around the InvalidFormatter exception’s message method. It employs let blocks for test setup and expectation matching to verify error message content.

The implementation leverages RSpec’s described_class feature for better maintainability and employs string inclusion matching for flexible error message verification.

Technical Details

Testing tools and configuration:

RSpec testing framework
Grape exception handling system
String type conversion testing
Message content verification using include matcher

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Focused test scope with single responsibility
Clear test case organization using describe blocks
Efficient test setup using let blocks
Descriptive error message validation
Use of described_class for better maintainability

ruby-grape/grape

spec/grape/exceptions/invalid_formatter_spec.rb

            
# frozen_string_literal: true

describe Grape::Exceptions::InvalidFormatter do
  describe '#message' do
    let(:error) do
      described_class.new(String, 'xml')
    end

    it 'contains the problem in the message' do
      expect(error.message).to include(
        'cannot convert String to xml'
      )
    end
  end
end