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Testing Base Export Operations in ddollar/foreman

This test suite validates the base export functionality in Foreman’s export module, focusing on core error handling and information display methods. It ensures the foundational export mechanisms work correctly for process management and deployment scenarios.

Test Coverage Overview

The test suite provides essential coverage for Foreman’s base export functionality, specifically targeting the core communication and error handling mechanisms.

Tests the ‘say’ method for displaying export information
Validates error handling through exception raising
Covers basic initialization with process file handling

Implementation Analysis

The testing approach utilizes RSpec’s expectation syntax with mock objects to verify behavior isolation. The implementation employs the fakefs gem for file system simulation, allowing controlled testing of file operations.

Uses let blocks for efficient test setup
Implements mock expectations for output verification
Leverages fake filesystem for isolation

Technical Details

RSpec testing framework
FakeFS for filesystem manipulation
Foreman::Engine for process management
FileUtils for directory operations
Custom exception handling for export errors

Best Practices Demonstrated

The test suite exemplifies clean testing practices with clear separation of concerns and proper isolation of test cases.

Isolated test setup using let blocks
Clear test descriptions and expectations
Proper mock object usage
Consistent error handling patterns

ddollar/foreman

spec/foreman/export/base_spec.rb

            
require "spec_helper"
require "foreman/engine"
require "foreman/export"

describe "Foreman::Export::Base", :fakefs do
  let(:procfile) { FileUtils.mkdir_p("/tmp/app"); write_procfile("/tmp/app/Procfile") }
  let(:location) { "/tmp/init" }
  let(:engine)   { Foreman::Engine.new().load_procfile(procfile) }
  let(:subject)  { Foreman::Export::Base.new(location, engine) }

  it "has a say method for displaying info" do
    expect(subject).to receive(:puts).with("[foreman export] foo")
    subject.send(:say, "foo")
  end

  it "raises errors as a Foreman::Export::Exception" do
    expect { subject.send(:error, "foo") }.to raise_error(Foreman::Export::Exception, "foo")
  end
end