Testing validations with MiniTest + Factory Girl

minitest_validations.rb

require "minitest_helper"
describe User do
  it "rejects a bad password in validation" do
    user = Factory.build(:user, :password_confirmation => 'Not my password')
    user.invalid?(:password_confirmation).must_equal true
    user.errors[:password_confirmation].must_equal "Password doesn't match confirmation"
  end
end