1test.rb

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts do |t|
  end
end

class Post < ActiveRecord::Base
  scope :one, -> { order(id: :asc).first }
end

class BugTest < Minitest::Test
  def test_scope_stuff
    post1 = Post.create!
    post2 = Post.create!
    post3 = Post.create!
    post4 = Post.create!

    assert_equal post1, Post.one
  end
end

2output.txt

-- create_table(:posts)
D, [2014-12-03T10:16:11.177162 #90023] DEBUG -- :    (0.6ms)  CREATE TABLE "posts" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL)
   -> 0.0062s
Run options: --seed 5055

# Running:

D, [2014-12-03T10:16:11.212085 #90023] DEBUG -- :    (0.1ms)  begin transaction
D, [2014-12-03T10:16:11.216655 #90023] DEBUG -- :   SQL (0.2ms)  INSERT INTO "posts" DEFAULT VALUES
D, [2014-12-03T10:16:11.217220 #90023] DEBUG -- :    (0.1ms)  commit transaction
D, [2014-12-03T10:16:11.217506 #90023] DEBUG -- :    (0.1ms)  begin transaction
D, [2014-12-03T10:16:11.218027 #90023] DEBUG -- :   SQL (0.1ms)  INSERT INTO "posts" DEFAULT VALUES
D, [2014-12-03T10:16:11.218317 #90023] DEBUG -- :    (0.1ms)  commit transaction
D, [2014-12-03T10:16:11.218626 #90023] DEBUG -- :    (0.1ms)  begin transaction
D, [2014-12-03T10:16:11.219029 #90023] DEBUG -- :   SQL (0.1ms)  INSERT INTO "posts" DEFAULT VALUES
D, [2014-12-03T10:16:11.219338 #90023] DEBUG -- :    (0.0ms)  commit transaction
D, [2014-12-03T10:16:11.219569 #90023] DEBUG -- :    (0.1ms)  begin transaction
D, [2014-12-03T10:16:11.219942 #90023] DEBUG -- :   SQL (0.1ms)  INSERT INTO "posts" DEFAULT VALUES
D, [2014-12-03T10:16:11.220253 #90023] DEBUG -- :    (0.1ms)  commit transaction
D, [2014-12-03T10:16:11.223953 #90023] DEBUG -- :   Post Load (0.1ms)  SELECT  "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT 1
.

Finished in 0.022305s, 44.8330 runs/s, 44.8330 assertions/s.

1 runs, 1 assertions, 0 failures, 0 errors, 0 skips