require 'git_tracker/standalone'

describe GitTracker::Standalone do

  describe '#save' do
    before do
      File.delete 'git-tracker' if File.exists? 'git-tracker'
    end

    after do
      File.delete 'git-tracker' if File.exists? 'git-tracker'
    end

    it 'saves to the named file' do
      described_class.save('git-tracker')
      expect(File.size('./git-tracker')).to be > 100
    end

    it 'marks the binary as executable' do
      described_class.save('git-tracker')
      expect(File).to be_executable('./git-tracker')
    end
  end

  describe '#build' do
    subject(:standalone_script) { described_class.build(io).string }
    let(:io) { StringIO.new }

    it 'declares a shebang' do
      expect(standalone_script).to match(/#!.+/)
    end

    it 'includes generated code notice' do
      expect(standalone_script).to include('This file is generated')
    end

    it 'inlines the code' do
      expect(standalone_script).to include('Hook')
      expect(standalone_script).to include('Repository')
      expect(standalone_script).to include('PrepareCommitMessage')
      expect(standalone_script).to include('Runner')
      expect(standalone_script).to include('Branch')
      expect(standalone_script).to include('CommitMessage')
      expect(standalone_script).to include('VERSION')
    end

    it 'inlines the message HEREDOC' do
      expect(standalone_script).to include('#{preamble.strip}')
    end

    it 'inlines the shebang for the hook' do
      expect(standalone_script).to include('#!/usr/bin/env bash')
    end

    it 'does not inline the standalone code' do
      expect(standalone_script).to_not include('module Standalone')
    end

    it 'includes the call to execute the hook' do
      expect(standalone_script).to include('GitTracker::Runner.execute(*ARGV)')
    end

    it 'excludes requiring git_tracker code' do
      expect(standalone_script).to_not match(/^require\s+["']git_tracker/)
    end
  end

  describe '#ruby_executable' do
    subject(:standalone) { described_class }
    before do
      RbConfig::CONFIG.stub(:[]).with('bindir') { '/some/other/bin' }
      RbConfig::CONFIG.stub(:[]).with('ruby_install_name') { 'ruby' }
    end

    it 'uses user-level ruby binary when it is executable' do
      File.stub(:executable?).with('/usr/bin/ruby') { true }
      expect(standalone.ruby_executable).to eq('/usr/bin/ruby')
    end

    it 'uses rbconfig ruby when user-level ruby binary not executable' do
      File.stub(:executable?).with('/usr/bin/ruby') { false }
      expect(standalone.ruby_executable).to eq('/some/other/bin/ruby')
    end
  end
end