如何将块传递给“有”期望的 RSpec答案

【问题标题】：how to pass block to RSpec "with" expectation如何将块传递给“有”期望的 RSpec
【发布时间】：2013-05-15 11:02:15
【问题描述】：

说我有课

Class Foo < ActiveRecord::Base

  def set_publication
      Publication.new do |publication|
        publication.owner_type = 'Foo'
        publication.owner_id   =  123
      end
      return 'something else'
  end
end

问题：如何测试发布新实例将收到的块

describe Foo, 'set_publication' do
  let(:foo){ Foo.new }

  it do
    Publication.should_recive(:new).with( ??????? ).and_return( double(:something) )
    foo.set_publication
  end
end

当然，这只是一个非常复杂的功能示例，我不能使用这样的哈希参数

Class Foo < ActiveRecord::Base

  def set_publication
     Publication.new owner_type: 'Foo', owner_id: 123         
     return 'something else'
  end
end

并像这样测试它

describe Foo, 'set_publication' do
  let(:foo){ Foo.new }

  it do
    Publication.should_recive(:new).with( owner_type: "Foo", owner_id: 123 ).and_return( double(:something) )
    foo.set_publication
  end
end

谢谢

更新：似乎有点不清楚我在这里问什么，所以：

我正在寻找方法来确保 Publication.new 使用一组参数显式调用，在这种情况下是一个块

所以我想是这样的

Publication.should_receive(:new).with(&block) # example

块参数 owner_type == 'foo' 和 owner_id == 123

【问题讨论】：

标签： rspec2 rspec-rails

【解决方案1】：

您可以使用 and_yield 来完成此操作。

class Foo
  def set_publication
    Publication.new do |publication|
      publication.owner_type = 'Foo'
      publication.owner_id   =  123
    end
    return 'something else'
  end
end

class Publication
  attr_accessor :owner_id, :owner_type

  def initialize
    yield self if block_given?
  end
end

和规格

describe Foo do 
  let(:foo) { Foo.new }
  let!(:publication) { Publication.new }

  it do
    Publication.should_receive(:new).and_yield(publication)

    foo.set_publication

    publication.owner_type.should eq 'Foo'
    publication.owner_id.should eq 123
  end
end

【讨论】：

【解决方案2】：

到目前为止，我唯一可能（且有效）的解决方案是：

Class Foo < ActiveRecord::Base

  def set_publication
      Publication.new &publication_block_params(123)
      return 'something else'
  end

  def publication_block_params(some_id)
    Proc.new do |publication|
      publication.owner_type = 'Foo'
      publication.owner_id   =  some_id # could be self.id but let's keep it this way 
    end
  end

end

和规格

describe Foo, 'set_publication' do
  let(:foo){ Foo.new }
  let(:my_block){ Proc.new {} }

  it do
    foo.should_receive(:publication_block_params).with(123).and_return(my_block)
    Publication.should_receive(:new).with( &my_block ).and_return( double(:something) )

    foo.set_publication
  end
end

然后单独为发布块参数创建规范

describe Foo, 'publication_block_params' do
  let(:foo){ Foo.new }

  it do      
    publication = Publication.new &foo.publication_block_params(123)
    publication.owner_id.should   be 123
    publication.owner_type.should be 'Foo'
  end
end

【讨论】：