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