test_case.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  # Activate the gem you are reporting the issue against.
  gem 'activerecord', '4.2.6'
  gem 'sqlite3'
end

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

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# 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 :foos, force: true do |t|
    t.decimal :floating_value
  end
end

class Foo < ActiveRecord::Base
  validates :floating_value, numericality: { greater_than: 100.5 }
end

class BugTest < Minitest::Test
  def test_numericality_error
    puts I18n.backend.store_translations(:nl, {
      errors: {
        messages: {
          greater_than: "moet groter zijn dan %{count}"
        }
      },
      number: {
        format: {
          separator: ",",
          delimiter: "."
        }
      }
    })

    I18n.locale = :nl

    foo = Foo.new(floating_value: 75.2)

    assert_equal false, foo.valid? # So far so good
    assert_equal 'moet groter zijn dan 100,5', foo.errors[:floating_value].first
  end
end