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require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/module/delegation'
require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/core_ext/kernel/reporting'
require 'active_support/concern'
require 'rails/generators'
module Rails
module Generators
module Testing
module Behaviour
extend ActiveSupport::Concern
included do
class_attribute :destination_root, :current_path, :generator_class, :default_arguments
# Generators frequently change the current path using +FileUtils.cd+.
# So we need to store the path at file load and revert back to it after each test.
self.current_path = File.expand_path(Dir.pwd)
self.default_arguments = []
end
module ClassMethods
# Sets which generator should be tested:
#
# tests AppGenerator
def tests(klass)
self.generator_class = klass
end
# Sets default arguments on generator invocation. This can be overwritten when
# invoking it.
#
# arguments %w(app_name --skip-active-record)
def arguments(array)
self.default_arguments = array
end
# Sets the destination of generator files:
#
# destination File.expand_path("../tmp", File.dirname(__FILE__))
def destination(path)
self.destination_root = path
end
end
# Runs the generator configured for this class. The first argument is an array like
# command line arguments:
#
# class AppGeneratorTest < Rails::Generators::TestCase
# tests AppGenerator
# destination File.expand_path("../tmp", File.dirname(__FILE__))
# teardown :cleanup_destination_root
#
# test "database.yml is not created when skipping Active Record" do
# run_generator %w(myapp --skip-active-record)
# assert_no_file "config/database.yml"
# end
# end
#
# You can provide a configuration hash as second argument. This method returns the output
# printed by the generator.
def run_generator(args=self.default_arguments, config={})
capture(:stdout) do
args += ['--skip-bundle'] unless args.include? '--dev'
self.generator_class.start(args, config.reverse_merge(destination_root: destination_root))
end
end
# Instantiate the generator.
def generator(args=self.default_arguments, options={}, config={})
@generator ||= self.generator_class.new(args, options, config.reverse_merge(destination_root: destination_root))
end
# Create a Rails::Generators::GeneratedAttribute by supplying the
# attribute type and, optionally, the attribute name:
#
# create_generated_attribute(:string, 'name')
def create_generated_attribute(attribute_type, name = 'test', index = nil)
Rails::Generators::GeneratedAttribute.parse([name, attribute_type, index].compact.join(':'))
end
protected
def destination_root_is_set? # :nodoc:
raise "You need to configure your Rails::Generators::TestCase destination root." unless destination_root
end
def ensure_current_path # :nodoc:
cd current_path
end
def prepare_destination # :nodoc:
rm_rf(destination_root)
mkdir_p(destination_root)
end
def migration_file_name(relative) # :nodoc:
absolute = File.expand_path(relative, destination_root)
dirname, file_name = File.dirname(absolute), File.basename(absolute).sub(/\.rb$/, '')
Dir.glob("#{dirname}/[0-9]*_*.rb").grep(/\d+_#{file_name}.rb$/).first
end
def capture(stream)
stream = stream.to_s
captured_stream = Tempfile.new(stream)
stream_io = eval("$#{stream}")
origin_stream = stream_io.dup
stream_io.reopen(captured_stream)
yield
stream_io.rewind
return captured_stream.read
ensure
captured_stream.close
captured_stream.unlink
stream_io.reopen(origin_stream)
end
end
end
end
end
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