1 files changed, 58 insertions, 20 deletions
diff --git a/railties/test/application/console_test.rb b/railties/test/application/console_test.rb
index f372afa51c..31bc003dcb 100644
--- a/railties/test/application/console_test.rb
+++ b/railties/test/application/console_test.rb
@@ -81,35 +81,73 @@ class ConsoleTest < ActiveSupport::TestCase
     assert_equal 'Once upon a time in a world...',
       helper.truncate('Once upon a time in a world far far away')
   end
+end
+
+begin
+  require "pty"
+rescue LoadError
+end
 
-  def test_with_sandbox
-    require 'rails/all'
-    value = false
+class FullStackConsoleTest < ActiveSupport::TestCase
+  def setup
+    skip "PTY unavailable" unless defined?(PTY) && PTY.respond_to?(:open)
 
-    Class.new(Rails::Railtie) do
-      console do |app|
-        value = app.sandbox?
+    build_app
+    app_file 'app/models/post.rb', <<-CODE
+      class Post < ActiveRecord::Base
       end
-    end
+    CODE
+    system "#{app_path}/bin/rails runner 'Post.connection.create_table :posts'"
 
-    load_environment(true)
-    assert value
+    @master, @slave = PTY.open
   end
 
-  def test_active_record_does_not_panic_when_referencing_an_observed_constant
-    add_to_config "config.active_record.observers = :user_observer"
+  def teardown
+    teardown_app
+  end
 
-    app_file "app/models/user.rb", <<-MODEL
-      class User < ActiveRecord::Base
-      end
-    MODEL
+  def assert_output(expected, timeout = 1)
+    timeout = Time.now + timeout
 
-    app_file "app/models/user_observer.rb", <<-MODEL
-      class UserObserver < ActiveRecord::Observer
+    output = ""
+    until output.include?(expected) || Time.now > timeout
+      if IO.select([@master], [], [], 0.1)
+        output << @master.read(1)
       end
-    MODEL
+    end
 
-    load_environment
-    assert_nothing_raised { User }
+    assert output.include?(expected), "#{expected.inspect} expected, but got:\n\n#{output}"
+  end
+
+  def write_prompt(command, expected_output = nil)
+    @master.puts command
+    assert_output command
+    assert_output expected_output if expected_output
+    assert_output "> "
+  end
+
+  def spawn_console
+    Process.spawn(
+      "#{app_path}/bin/rails console --sandbox",
+      in: @slave, out: @slave, err: @slave
+    )
+
+    assert_output "> ", 30
+  end
+
+  def test_sandbox
+    spawn_console
+
+    write_prompt "Post.count", "=> 0"
+    write_prompt "Post.create"
+    write_prompt "Post.count", "=> 1"
+    @master.puts "quit"
+
+    spawn_console
+
+    write_prompt "Post.count", "=> 0"
+    write_prompt "Post.transaction { Post.create; raise }"
+    write_prompt "Post.count", "=> 0"
+    @master.puts "quit"
   end
 end