在一堆rspec rails单元规格中,我做了类似的事情:
describe Foo do [:bar,:baz].each do |a| it "should have many #{a}" do Foo.should have_many(a) end end end
为了更清洁的代码,我宁愿做类似的事情:
describe Foo do spec_has_many Foo,:bar,:baz end
那么如何编写像spec_has_many()这样的辅助方法来插入DSL代码,如rspec的it()方法?如果它是一个普通的实例方法,我会做类似的事情:
def spec_has_many(model,*args) args.each do |a| define_method("it_should_have_many_#{a}") do model.should have_many(a) end end end
定义rspec示例的等价物是什么?
解决方法
好吧,这需要一些麻烦,但我认为我得到了它的工作.这是一个元编程的hackery,我个人只会使用你描述的第一件事,但这就是你想要的:P
module ExampleMacros def self.included(base) base.extend(ClassMethods) end module ClassMethods # This will be available as a "Class Macro" in the included class def should_have_many(*args) args.each do |a| # Runs the 'it' block in the context of the current instance instance_eval do # This is just normal RSpec code at this point it "should have_many #{a.to_s}" do subject.should have_many(a) end end end end end end describe Foo do # Include the module which will define the should_have_many method # Can be done automatically in RSpec configuration (see below) include ExampleMacros # This may or may not be required,but the should_have_many method expects # subject to be defined (which it is by default,but this just makes sure # it's what we expect) subject { Foo } # And off we go. Note that you don't need to pass it a model should_have_many :a,:b end
我的规格失败了,因为Foo没有has_many?方法,但两个测试运行,所以它应该工作.
您可以在spec_helper.rb文件中定义(并重命名)ExampleMacros模块,它可以包含在内.您想在描述块(而不是其他任何块)中调用包含ExampleMacros.
要使所有规范自动包含模块,请像这样配置RSpec:
# RSpec 2.0.0 RSpec.configure do |c| c.include ExampleMacros end
原文地址:https://www.jb51.cc/ruby/265385.html
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。