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Testing File Attachment Validation Matchers in Paperclip

This test suite validates the HaveAttachedFileMatcher functionality in Paperclip’s Shoulda matchers. It ensures proper attachment validation behavior for models using Paperclip’s file attachment system. The tests verify both positive and negative cases of file attachment detection.

Test Coverage Overview

The test suite provides comprehensive coverage of the HaveAttachedFileMatcher functionality:

Verification of models without attachments
Validation of models with properly configured attachments
Testing of matcher acceptance and rejection scenarios

Implementation Analysis

The testing approach utilizes RSpec’s expect syntax with custom matchers. The implementation leverages Paperclip’s Shoulda matcher integration, demonstrating both positive and negative test cases through model rebuilding and table resetting patterns.

Technical Details

Key technical components include:

RSpec testing framework
Paperclip’s Shoulda matchers
Model reset and rebuild helpers
Custom matcher extension methods

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test scenarios through table/class reset
Clear test case separation
Explicit matcher behavior verification
Proper setup and teardown patterns

thoughtbot/paperclip

spec/paperclip/matchers/have_attached_file_matcher_spec.rb

            
require 'spec_helper'
require 'paperclip/matchers'

describe Paperclip::Shoulda::Matchers::HaveAttachedFileMatcher do
  extend Paperclip::Shoulda::Matchers

  it "rejects the dummy class if it has no attachment" do
    reset_table "dummies"
    reset_class "Dummy"
    matcher = self.class.have_attached_file(:avatar)
    expect(matcher).to_not accept(Dummy)
  end

  it 'accepts the dummy class if it has an attachment' do
    rebuild_model
    matcher = self.class.have_attached_file(:avatar)
    expect(matcher).to accept(Dummy)
  end
end