如何测试validate_uniqueness_of？

Question

我正在打一场心理障碍.任何人都可以向我解释如何为validate_uniqueness_of编写规范测试？

Answer 1

或者使用Shoulda:

before do
  @user = Factory(:user)
end

subject { @user }

it { should validate_uniqueness_of(:name) }

Answer 2

class Foo < ActiveRecord::Base
  validates_uniqueness_of :name
end

# spec
describe Foo do
  it "should have a unique name" do
    Foo.create!(:name=>"Foo")
    foo = Foo.new(:name=>"Foo")
    foo.should_not be_valid
    foo.errors[:name].should include("has already been taken")
  end
end