题
在一堆RSPEC Rails单元规格中,我会做类似的事情:
describe Foo do
[:bar, :baz].each do |a|
it "should have many #{a}" do
Foo.should have_many(a)
end
end
end
对于清洁代码,我宁愿做类似的事情:
describe Foo do
spec_has_many Foo, :bar, :baz
end
那么我如何写一个助手方法 spec_has_many()
用于插入DSL代码,例如RSPEC it()
方法?如果是普通实例方法,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示例的等效是什么?
解决方案
好的,这花了一些搞砸了,但是我想我可以正常工作。这是一些元编程的黑客,我个人只会使用您描述的第一件事,但这是您想要的: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,但两种测试都进行,因此应该有效。
您可以定义(并重命名)您的extplemacros模块 spec_helper.rb
文件,它将用于包含。你想打电话 include ExampleMacros
在你的 describe
块(而不是其他块)。
要使所有规格都包括自动包含模块,请像这样配置RSPEC:
# RSpec 2.0.0
RSpec.configure do |c|
c.include ExampleMacros
end
不隶属于 StackOverflow