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Testing Package Format Conversion Functionality in jordansissel/fpm

This test suite examines the package conversion functionality in FPM (Effing Package Management), specifically focusing on converting Ruby Gem packages to RPM format. The tests verify attribute preservation, default settings application, and package naming conventions during the conversion process.

Test Coverage Overview

The test coverage focuses on the package conversion functionality between Gem and RPM formats. Key areas tested include:

Default RPM compression attribute application
Preservation of source package attributes
Package naming prefix handling
Package provides declarations verification

Implementation Analysis

The testing approach utilizes RSpec’s let blocks for setup and subject definition, creating a controlled test environment. The implementation follows behavior-driven development patterns with explicit expectations for package attributes and metadata verification.

The tests leverage RSpec’s describe and it blocks with insist assertions to validate package conversion behavior.

Technical Details

Testing tools and configuration:

RSpec testing framework
FPM package management library
Custom spec_setup helper
Package conversion between Gem and RPM formats
Attribute mapping verification

Best Practices Demonstrated

The test suite demonstrates several testing best practices including isolated test cases, clear setup using let blocks, and focused assertions. The code organization follows a logical structure with proper separation of concerns between setup and verification phases.

Isolated test scenarios
Clear test case naming
Consistent assertion patterns
Focused test scope

jordansissel/fpm

spec/fpm/package_convert_spec.rb

            
require "spec_setup"
require "fpm" # local

describe "FPM::Package#convert" do

  let(:gem_package_name_prefix) { 'rubygem19' }
  let(:default_rpm_compression) { 'gzip' }

  subject do
    source = FPM::Package::Gem.new
    prefix = source.attributes[:gem_package_name_prefix ] = 'rubygem19'
    name = source.name = "whatever"
    version = source.version = "1.0"
    source.provides << "#{prefix}-#{name} = #{version}"
    source.convert(FPM::Package::RPM)
  end

  it "applies the default attributes for target format" do
    insist { subject.attributes[:rpm_compression] } == default_rpm_compression
  end

  it "remembers attributes applied to source" do
    insist { subject.attributes[:gem_package_name_prefix] } == gem_package_name_prefix
  end

  it "should list provides matching the gem_package_name_prefix (#585)" do
    insist { subject.provides }.include?("rubygem19(whatever) = 1.0")
  end
end