用rspec測試after_create

Question

我在我的模型中有代碼。

class Foo < ActiveRecord::Base 
after_create :create_node_for_foo 

    def create_node_for_user 
    FooBar.create(id: self.id) 
    end 
end 

，並有代碼美孚模型

describe Foo do 

    let (:foo) {FactoryGirl.create(:foo)} 

    subject { foo } 
    it { should respond_to(:email) } 
    it { should respond_to(:fullname) } 

it "have mass assignable attributes" do 
    foo.should allow_mass_assignment_of :email 
    foo.should allow_mass_assignment_of :fullname 
end 

it "create node in graph database" do 
    foo1 = FactoryGirl.create(:foo) 
    FooBar.should_receive(:create).with(id: foo1.id) 
end 
end 

的RSpec的，但我的測試與消息

Failures: 

    1) Foo create node in graph database on 
     Failure/Error: FooBar.should_receive(:create).with(id: foo1.id) 
     (<FooBar (class)>).create({:id=>18}) 
     expected: 1 time 
     received: 0 times 

沒有什麼可能是錯誤的？

Answer 1

好有問題

得到周圍改變了這種

it "create node in graph database" do 
    foo1 = FactoryGirl.create(:foo) 
    FooBar.should_receive(:create).with(id: foo1.id) 
end 

到

it "create node in graph database" do 
    foo1 = FactoryGirl.build(:foo) 
    FooBar.should_receive(:create).with(id: foo1.id) 
    foo1.save 
end 

Answer 2

有點遲到了，但實際上上述將無法正常工作。您可以創建自定義匹配做到這一點：

class EventualValueMatcher 
    def initialize(&block) 
    @block = block 
    end 

    def ==(value) 
    @block.call == value 
    end 
end 

def eventual_value(&block) 
    EventualValueMatcher.new(&block) 
end 

在規範

然後做：

it "create node in graph database" do 
    foo1 = FactoryGirl.build(:foo) 
    FooBar.should_receive(:create).with(eventual_value { { id: foo1.id } }) 
    foo1.save 
end 

這意味着，模擬不評估塊，直到事後，它實際上已經集。