Gem::FakeFetcher

A fake Gem::RemoteFetcher for use in tests or to avoid real live HTTP requests when testing code that uses RubyGems.

Example:

@fetcher = Gem::FakeFetcher.new
@fetcher.data['http://gems.example.com/yaml'] = source_index.to_yaml
Gem::RemoteFetcher.fetcher = @fetcher

use nested array if multiple response is needed

@fetcher.data['http://gems.example.com/sequence'] = [['Success', 200, 'OK'], ['Failed', 401, 'Unauthorized']]

@fetcher.fetch_path('http://gems.example.com/sequence') # => ['Success', 200, 'OK']
@fetcher.fetch_path('http://gems.example.com/sequence') # => ['Failed', 401, 'Unauthorized']

# invoke RubyGems code

paths = @fetcher.paths
assert_equal 'http://gems.example.com/yaml', paths.shift
assert paths.empty?, paths.join(', ')

See RubyGems’ tests for more examples of FakeFetcher.

Attributes

data[R]

last_request[R]

paths[RW]

Public Class Methods

new() click to toggle source

 
               # File rubygems/test_utilities.rb, line 36
def initialize
  @data = {}
  @paths = []
end

Public Instance Methods

cache_update_path(uri, path = nil, update = true) click to toggle source

 
               # File rubygems/test_utilities.rb, line 77
def cache_update_path(uri, path = nil, update = true)
  if data = fetch_path(uri)
    open(path, 'wb') {|io| io.write data } if path and update
    data
  else
    Gem.read_binary(path) if path
  end
end

download(spec, source_uri, install_dir = Gem.dir) click to toggle source

 
               # File rubygems/test_utilities.rb, line 135
def download(spec, source_uri, install_dir = Gem.dir)
  name = File.basename spec.cache_file
  path = if Dir.pwd == install_dir # see fetch_command
           install_dir
         else
           File.join install_dir, "cache"
         end

  path = File.join path, name

  if source_uri =~ /^http/
    File.open(path, "wb") do |f|
      f.write fetch_path(File.join(source_uri, "gems", name))
    end
  else
    FileUtils.cp source_uri, path
  end

  path
end

download_to_cache(dependency) click to toggle source

 
               # File rubygems/test_utilities.rb, line 156
def download_to_cache(dependency)
  found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dependency

  return if found.empty?

  spec, source = found.first

  download spec, source.uri.to_s
end

fetch_path(path, mtime = nil, head = false) click to toggle source

 
               # File rubygems/test_utilities.rb, line 64
def fetch_path(path, mtime = nil, head = false)
  data = find_data(path)

  if data.respond_to?(:call)
    data.call
  else
    if path.to_s.end_with?(".gz") and not data.nil? and not data.empty?
      data = Gem::Util.gunzip data
    end
    data
  end
end

fetch_size(path) click to toggle source

 
               # File rubygems/test_utilities.rb, line 120
def fetch_size(path)
  path = path.to_s
  @paths << path

  raise ArgumentError, 'need full URI' unless path =~ %r{^http://}

  unless @data.key? path
    raise Gem::RemoteFetcher::FetchError.new("no data for #{path}", path)
  end

  data = @data[path]

  data.respond_to?(:call) ? data.call : data.length
end

find_data(path) click to toggle source

 
               # File rubygems/test_utilities.rb, line 41
def find_data(path)
  return Gem.read_binary path.path if URI === path and 'file' == path.scheme

  if URI === path and "URI::#{path.scheme.upcase}" != path.class.name
    raise ArgumentError,
      "mismatch for scheme #{path.scheme} and class #{path.class}"
  end

  path = path.to_s
  @paths << path
  raise ArgumentError, 'need full URI' unless path.start_with?("https://", "http://")

  unless @data.key? path
    raise Gem::RemoteFetcher::FetchError.new("no data for #{path}", path)
  end

  if @data[path].kind_of?(Array) && @data[path].first.kind_of?(Array)
    @data[path].shift
  else
    @data[path]
  end
end

open_uri_or_path(path) click to toggle source

Thanks, FakeWeb!

 
               # File rubygems/test_utilities.rb, line 87
def open_uri_or_path(path)
  data = find_data(path)
  body, code, msg = data

  response = Net::HTTPResponse.send(:response_class, code.to_s).new("1.0", code.to_s, msg)
  response.instance_variable_set(:@body, body)
  response.instance_variable_set(:@read, true)
  response
end

request(uri, request_class, last_modified = nil) click to toggle source

 
               # File rubygems/test_utilities.rb, line 97
def request(uri, request_class, last_modified = nil)
  data = find_data(uri)
  body, code, msg = (data.respond_to?(:call) ? data.call : data)

  @last_request = request_class.new uri.request_uri
  yield @last_request if block_given?

  response = Net::HTTPResponse.send(:response_class, code.to_s).new("1.0", code.to_s, msg)
  response.instance_variable_set(:@body, body)
  response.instance_variable_set(:@read, true)
  response
end

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Gem::FakeFetcher

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