ruby – Rails / RSpec:如何测试#initialize方法?
发布时间:2020-12-16 19:51:37 所属栏目:百科 来源:网络整理
导读:如何使用RSpec指定#initialize行为?例如: generator.rb class Generator attr_accessor :seed def initialize(seed = nil) @seed = seed || pick_seed end def pick_seed Time.now.to_i endend generator_spec.rb require 'generator'describe Generator i
如何使用RSpec指定#initialize行为?例如:
generator.rb class Generator attr_accessor :seed def initialize(seed = nil) @seed = seed || pick_seed end def pick_seed Time.now.to_i end end generator_spec.rb require 'generator' describe Generator it "calls 'pick_seed' method unless seed specified" do end end 我想设置期望从#initialize方法调用的pick_seed方法. 解决方法
对我来说,期望是在协作者之间设计对话.所以,你必须决定 – #pick_seed是内部实现细节还是协作角色界面的一部分?
如果pick_seed是一个实现细节,期望是工作的错误工具.而且,因为你有一个种子的访问器,你可以这样进行(注意一个例子) class Generator attr_accessor :seed def initialize(seed = nil) @seed = seed || pick_seed end def pick_seed Time.now.to_i end end describe Generator do context "creating" do context "when a seed is specified" do it "uses that seed" do seed = 123 generator = Generator.new(seed) generator.seed.should == seed end end context "when a seed is not specified" do it "creates its own seed" do generator = Generator.new generator.seed.should_not be_nil end end end end OTOH,如果选择种子是“种子选择器”角色的一部分,那么嘲讽在设计种子选择器时是有价值的,依赖注入是分配角色的标准方法.你可以写下如下: class GeneratorWithCollaborator attr_accessor :seed def initialize(seed = nil,seed_picker = self) @seed = seed || seed_picker.pick_seed end def pick_seed Time.now.to_i end end describe GeneratorWithCollaborator do context "creating" do context "when a seed is specified" do it "uses that seed" do seed = 123 seed_picker = double('seed picker') seed_picker.should_not_receive(:pick_seed) generator = GeneratorWithCollaborator.new(seed,seed_picker) generator.pick_seed end end context "when a seed is not specified" do it "delegates to its seed picker" do seed_picker = double('seed picker') seed_picker.should_receive(:pick_seed) generator = GeneratorWithCollaborator.new(nil,seed_picker) end end end end (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |