-
-
Save srbaker/a532f43df9de90f5fd9d600039b4eaea to your computer and use it in GitHub Desktop.
A demonstration of how you might implement a `context` helper for sharing state between tests when using the declarative `test` helper in ActiveSupport.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| ## | |
| # A demonstration of how you might implement a context helper in a | |
| # declarative style for Minitest, when you use the declarative style | |
| # from ActiveSupport. | |
| # | |
| # It's a fun hack, of the sort I like in Ruby. But you probably | |
| # shouldn't use it. | |
| # | |
| # No, you definitely should not use this. But I told you idiots the | |
| # same thing when I released RSpec two decades ago, and you didn't | |
| # listen then, so why in the fuck would you listen to me now? | |
| # | |
| # If you think this kind of thing is clever, or you like the stuff I | |
| # create, you should definitely email me so we can work together. I'd | |
| # like to help you make your test suites more resilient, and your code | |
| # better. | |
| # | |
| # Fan mail can be sent to: steven@stevenrbaker.com | |
| # | |
| # I would be happy to discuss this, why it's wonky, and stuff. I do | |
| # love Ruby. | |
| # | |
| # | |
| require 'bundler/inline' | |
| gemfile do | |
| source 'https://rubygems.org' | |
| gem 'minitest' | |
| gem 'activesupport' | |
| end | |
| require "minitest/autorun" | |
| require "active_support" | |
| module Context | |
| def context name, &block | |
| context_name = "Context#{name.gsub(/\s+/, '_').camelize}".to_sym | |
| context_class = Object.const_set context_name, Class.new(self) | |
| context_class.instance_methods.select { |method| method.to_s.start_with? "test_" }.each do |method| | |
| context_class.undef_method method | |
| end | |
| context_class.class_eval &block | |
| end | |
| end | |
| class ContextTest < ActiveSupport::TestCase | |
| extend Context | |
| end | |
| class FooTest < ContextTest | |
| def setup | |
| @foo = "foo" | |
| end | |
| test "foo is foo" do | |
| assert_equal "foo", @foo | |
| end | |
| test "bar is undefined" do | |
| assert_nil @bar | |
| end | |
| context "with bar and baz" do | |
| def setup | |
| super # FIXME: this is fucked, it should be done in #context | |
| @bar = "bar" | |
| @baz = "baz" | |
| end | |
| test "bar is bar" do | |
| assert_equal "bar", @bar | |
| end | |
| test "baz is baz" do | |
| assert_equal "bar", @bar | |
| end | |
| test "foo is still foo" do | |
| assert_equal "foo", @foo | |
| end | |
| end | |
| context "with qux but not bar and baz" do | |
| def setup | |
| super # FIXME: still fucked | |
| @qux = "qux" | |
| end | |
| test "bar is undefined" do | |
| assert_nil @bar | |
| end | |
| test "baz is undefined" do | |
| assert_nil @bar | |
| end | |
| test "foo is still foo" do | |
| assert_equal "foo", @foo | |
| end | |
| test "qux is qux" do | |
| assert_equal "qux", @qux | |
| end | |
| end | |
| context "with a nested context" do | |
| def setup | |
| super # FIXME: still fucked | |
| @quux = "quux" | |
| end | |
| test "quux is quux" do | |
| assert_equal "quux", @quux | |
| end | |
| context "the nested context" do | |
| test "quux and foo exist, but not bar or baz or qux" do | |
| assert_equal "quux", @quux | |
| assert_equal "foo", @foo | |
| assert_nil @bar | |
| assert_nil @baz | |
| assert_nil @qux | |
| end | |
| end | |
| end | |
| end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
I lol’d at the comment