Ruby on rails 为什么我的RSpec测试失败

这是我的模型：

class Restaurant < ActiveRecord::Base
    validate :name, presence: true, uniqueness: { case_sensitive: false }
end

当我运行测试时，我会失败：

$ bundle exec rspec spec/models
..FF

Failures:

  1) Restaurant when name is not present should not be valid
     Failure/Error: it { should_not be_valid}
       expected #<Restaurant id: nil, name: " ", created_at: nil, updated_at: nil> not to be valid
     # ./spec/models/restaurant_spec.rb:15:in `block (3 levels) in <top (required)>'

  2) Restaurant when name is already taken should not be valid
     Failure/Error: it { should_not be_valid }
       expected #<Restaurant id: nil, name: "Momofuku", created_at: nil, updated_at: nil> not to be valid
     # ./spec/models/restaurant_spec.rb:25:in `block (3 levels) in <top (required)>'

Finished in 0.01879 seconds
4 examples, 2 failures

Failed examples:

rspec ./spec/models/restaurant_spec.rb:15 # Restaurant when name is not present should not be valid
rspec ./spec/models/restaurant_spec.rb:25 # Restaurant when name is already taken should not be valid

Randomized with seed 39746

$bundle exec rspec规格/型号
..FF
失败：
1） 名称不存在的餐厅应无效
失败/错误：它{应该是无效的}
应为无效
#./spec/models/restaurant_spec.rb:15:in'block（3层）in'
2） 已使用名称的餐厅应无效
失败/错误：它{应该是无效的}
应为无效
#./spec/models/restaurant_spec.rb:25:in'block（3层）in'
以0.01879秒完成
4个示例，2个故障
失败的示例：
rspec./spec/models/restaurant_spec.rb:15#名称不存在的餐厅应无效
rspec./spec/models/restaurant_spec.rb:25#已使用名称的餐厅应无效
随机化种子39746

---

为什么？

使用验证而不是验证

$ bundle exec rspec spec/models
..FF

Failures:

  1) Restaurant when name is not present should not be valid
     Failure/Error: it { should_not be_valid}
       expected #<Restaurant id: nil, name: " ", created_at: nil, updated_at: nil> not to be valid
     # ./spec/models/restaurant_spec.rb:15:in `block (3 levels) in <top (required)>'

  2) Restaurant when name is already taken should not be valid
     Failure/Error: it { should_not be_valid }
       expected #<Restaurant id: nil, name: "Momofuku", created_at: nil, updated_at: nil> not to be valid
     # ./spec/models/restaurant_spec.rb:25:in `block (3 levels) in <top (required)>'

Finished in 0.01879 seconds
4 examples, 2 failures

Failed examples:

rspec ./spec/models/restaurant_spec.rb:15 # Restaurant when name is not present should not be valid
rspec ./spec/models/restaurant_spec.rb:25 # Restaurant when name is already taken should not be valid

Randomized with seed 39746