Back to Repositories

Testing PluralCache Interpolation System in Paperclip

This test suite evaluates the PluralCache functionality in Paperclip’s interpolation system. It focuses on verifying the caching mechanism for pluralized symbols and class names, ensuring consistent and efficient string transformations. The tests validate both caching behavior and correct pluralization outcomes.

Test Coverage Overview

The test suite provides comprehensive coverage of the PluralCache class functionality in Paperclip’s interpolation system.

Key areas tested include:

Symbol pluralization caching
Class name underscoring and pluralization caching
Correct pluralization of words
Accurate transformation of class names to pluralized, underscored formats

Implementation Analysis

The testing approach utilizes RSpec’s expectation syntax to verify both caching behavior and string transformation accuracy. The implementation employs object identity comparison using ‘equal’ for cache verification and string equality for transformation results.

The tests demonstrate:

Cache hit verification using object identity
String transformation accuracy checks
Class name handling with dynamic class definition

Technical Details

Testing tools and configuration:

RSpec testing framework
Paperclip::Interpolations::PluralCache class
Dynamic class definition for testing class name transformations
Object identity comparison for cache verification
String equality checking for transformation validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby and RSpec.

Notable practices include:

Isolated test cases with clear, single-responsibility expectations
Consistent setup patterns for each test
Explicit verification of both caching and transformation behavior
Clear test descriptions that indicate functionality being tested
Efficient test organization with related cases grouped together

thoughtbot/paperclip

spec/paperclip/plural_cache_spec.rb

            
require 'spec_helper'

describe 'Plural cache' do
  it 'caches pluralizations' do
    cache = Paperclip::Interpolations::PluralCache.new
    symbol = :box

    first = cache.pluralize_symbol(symbol)
    second = cache.pluralize_symbol(symbol)
    expect(first).to equal(second)
  end

  it 'caches pluralizations and underscores' do
    class BigBox ; end
    cache = Paperclip::Interpolations::PluralCache.new
    klass = BigBox

    first = cache.underscore_and_pluralize_class(klass)
    second = cache.underscore_and_pluralize_class(klass)
    expect(first).to equal(second)
  end

  it 'pluralizes words' do
    cache = Paperclip::Interpolations::PluralCache.new
    symbol = :box

    expect(cache.pluralize_symbol(symbol)).to eq("boxes")
  end

  it 'pluralizes and underscore class names' do
    class BigBox ; end
    cache = Paperclip::Interpolations::PluralCache.new
    klass = BigBox

    expect(cache.underscore_and_pluralize_class(klass)).to eq("big_boxes")
  end
end