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Diffstat (limited to 'railties/lib/rails/generators/test_case.rb')
-rw-r--r-- | railties/lib/rails/generators/test_case.rb | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/railties/lib/rails/generators/test_case.rb b/railties/lib/rails/generators/test_case.rb new file mode 100644 index 0000000000..643d7856c5 --- /dev/null +++ b/railties/lib/rails/generators/test_case.rb @@ -0,0 +1,239 @@ +require 'active_support/test_case' +require 'active_support/core_ext/class/inheritable_attributes' +require 'active_support/core_ext/hash/reverse_merge' +require 'rails/generators' +require 'fileutils' + +module Rails + module Generators + # Disable color in output. Easier to debug. + no_color! + + # This class provides a TestCase for testing generators. To setup, you need + # just to configure the destination and set which generator is being tested: + # + # class AppGeneratorTest < Rails::Generators::TestCase + # tests AppGenerator + # destination File.expand_path("../tmp", File.dirname(__FILE__)) + # end + # + # If you want to ensure your destination root is clean before running each test, + # you can set a setup callback: + # + # class AppGeneratorTest < Rails::Generators::TestCase + # tests AppGenerator + # destination File.expand_path("../tmp", File.dirname(__FILE__)) + # setup :prepare_destination + # end + # + class TestCase < ActiveSupport::TestCase + include FileUtils + + extlib_inheritable_accessor :destination_root, :current_path, :generator_class, + :default_arguments, :instance_writer => false + + # 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 = [] + + setup :destination_root_is_set?, :ensure_current_path + teardown :ensure_current_path + + # Sets which generator should be tested: + # + # tests AppGenerator + # + def self.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-activerecord) + # + def self.arguments(array) + self.default_arguments = array + end + + # Sets the destination of generator files: + # + # destination File.expand_path("../tmp", File.dirname(__FILE__)) + # + def self.destination(path) + self.destination_root = path + end + + # Captures the given stream and returns it: + # + # stream = capture(:stdout){ puts "Cool" } + # stream #=> "Cool\n" + # + def capture(stream) + begin + stream = stream.to_s + eval "$#{stream} = StringIO.new" + yield + result = eval("$#{stream}").string + ensure + eval("$#{stream} = #{stream.upcase}") + end + + result + end + alias :silence :capture + + # Asserts a given file exists. You need to supply an absolute path or a path relative + # to the configured destination: + # + # assert_file "config/environment.rb" + # + # You can also give extra arguments. If the argument is a regexp, it will check if the + # regular expression matches the given file content. If it's a string, it compares the + # file with the given string: + # + # assert_file "config/environment.rb", /initialize/ + # + # Finally, when a block is given, it yields the file content: + # + # assert_file "app/controller/products_controller.rb" do |controller| + # assert_instance_method :index, content do |index| + # assert_match /Product\.all/, index + # end + # end + # + def assert_file(relative, *contents) + absolute = File.expand_path(relative, destination_root) + assert File.exists?(absolute), "Expected file #{relative.inspect} to exist, but does not" + + read = File.read(absolute) if block_given? || !contents.empty? + yield read if block_given? + + contents.each do |content| + case content + when String + assert_equal content, read + when Regexp + assert_match content, read + end + end + end + alias :assert_directory :assert_file + + # Asserts a given file does not exist. You need to supply an absolute path or a + # path relative to the configured destination: + # + # assert_no_file "config/random.rb" + # + def assert_no_file(relative) + absolute = File.expand_path(relative, destination_root) + assert !File.exists?(absolute), "Expected file #{relative.inspect} to not exist, but does" + end + alias :assert_no_directory :assert_no_file + + # Asserts a given file does not exist. You need to supply an absolute path or a + # path relative to the configured destination: + # + # assert_migration "db/migrate/create_products.rb" + # + # This method manipulates the given path and tries to find any migration which + # matches the migration name. For example, the call above is converted to: + # + # assert_file "db/migrate/003_create_products.rb" + # + # Consequently, assert_migration accepts the same arguments has assert_file. + # + def assert_migration(relative, *contents, &block) + file_name = migration_file_name(relative) + assert file_name, "Expected migration #{relative} to exist, but was not found" + assert_file file_name, *contents, &block + end + + # Asserts a given migration does not exist. You need to supply an absolute path or a + # path relative to the configured destination: + # + # assert_no_file "config/random.rb" + # + def assert_no_migration(relative) + file_name = migration_file_name(relative) + assert_nil file_name, "Expected migration #{relative} to not exist, but found #{file_name}" + end + + # Asserts the given class method exists in the given content. This method does not detect + # class methods inside (class << self), only class methods which starts with "self.". + # When a block is given, it yields the content of the method. + # + # assert_migration "db/migrate/create_products.rb" do |migration| + # assert_class_method :up, migration do |up| + # assert_match /create_table/, up + # end + # end + # + def assert_class_method(method, content, &block) + assert_instance_method "self.#{method}", content, &block + end + + # Asserts the given method exists in the given content. When a block is given, + # it yields the content of the method. + # + # assert_file "app/controller/products_controller.rb" do |controller| + # assert_instance_method :index, content do |index| + # assert_match /Product\.all/, index + # end + # end + # + def assert_instance_method(method, content) + assert content =~ /def #{method}(\(.+\))?(.*?)\n end/m, "Expected to have method #{method}" + yield $2.strip if block_given? + end + alias :assert_method :assert_instance_method + + # Runs the generator configured for this class. The first argument is an array like + # command line arguments: + # + # class AppGeneratorTest < Rails::Generators::TestCase + # tests AppGenerator + # destination File.expand_path("../tmp", File.dirname(__FILE__)) + # teardown :cleanup_destination_root + # + # test "database.yml is not created when skipping activerecord" do + # run_generator %w(myapp --skip-activerecord) + # assert_no_file "config/database.yml" + # end + # end + # + # You can provide a configuration hash as second argument. This method returns the output + # printed by the generator. + def run_generator(args=self.default_arguments, config={}) + capture(:stdout) { self.generator_class.start(args, config.reverse_merge(:destination_root => destination_root)) } + end + + # Instantiate the generator. + def generator(args=self.default_arguments, options={}, config={}) + @generator ||= self.generator_class.new(args, options, config.reverse_merge(:destination_root => destination_root)) + end + + protected + + def destination_root_is_set? #:nodoc: + raise "You need to configure your Rails::Generators::TestCase destination root." unless destination_root + end + + def ensure_current_path #:nodoc: + cd current_path + end + + def prepare_destination + rm_rf(destination_root) + mkdir_p(destination_root) + end + + def migration_file_name(relative) #:nodoc: + absolute = File.expand_path(relative, destination_root) + dirname, file_name = File.dirname(absolute), File.basename(absolute).sub(/\.rb$/, '') + Dir.glob("#{dirname}/[0-9]*_*.rb").grep(/\d+_#{file_name}.rb$/).first + end + end + end +end
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