brew/Library/Homebrew/test/test_download_strategies.rb

require "testing_env"
require "download_strategy"

class ResourceDouble
  attr_reader :url, :specs, :version

  def initialize(url = "http://example.com/foo.tar.gz", specs = {})
    @url = url
    @specs = specs
  end
end

class AbstractDownloadStrategyTests < Homebrew::TestCase
  def setup
    @name = "foo"
    @resource = ResourceDouble.new
    @strategy = AbstractDownloadStrategy.new(@name, @resource)
    @args = %w[foo bar baz]
  end

  def test_expand_safe_system_args_with_explicit_quiet_flag
    @args << { :quiet_flag => "--flag" }
    expanded_args = @strategy.expand_safe_system_args(@args)
    assert_equal %w[foo bar baz --flag], expanded_args
  end

  def test_expand_safe_system_args_with_implicit_quiet_flag
    expanded_args = @strategy.expand_safe_system_args(@args)
    assert_equal %w[foo bar -q baz], expanded_args
  end

  def test_expand_safe_system_args_does_not_mutate_argument
    result = @strategy.expand_safe_system_args(@args)
    assert_equal %w[foo bar baz], @args
    refute_same @args, result
  end
end

class VCSDownloadStrategyTests < Homebrew::TestCase
  def test_cache_filename
    resource = ResourceDouble.new("http://example.com/bar")
    strategy = Class.new(VCSDownloadStrategy) do
      def cache_tag
        "foo"
      end
    end
    downloader = strategy.new("baz", resource)
    assert_equal HOMEBREW_CACHE.join("baz--foo"), downloader.cached_location
  end
end

class DownloadStrategyDetectorTests < Homebrew::TestCase
  def setup
    @d = DownloadStrategyDetector.new
  end

  def test_detect_git_download_startegy
    @d = DownloadStrategyDetector.detect("git://example.com/foo.git")
    assert_equal GitDownloadStrategy, @d
  end

  def test_default_to_curl_strategy
    @d = DownloadStrategyDetector.detect(Object.new)
    assert_equal CurlDownloadStrategy, @d
  end

  def test_raises_when_passed_unrecognized_strategy
    assert_raises(TypeError) do
      DownloadStrategyDetector.detect("foo", Class.new)
    end
  end
end