我有一个函数,它接受一个块,打开一个文件,产生并返回:
def start &block
.....do some stuff
File.open("filename", "w") do |f|
f.write("something")
....do some more stuff
yield
end
end
我正在尝试使用 rspec 为其编写一个测试。如何存根 File.open 以便它将对象 f (由我提供)传递到块而不是尝试打开实际文件?比如:
it "should test something" do
myobject = double("File", {'write' => true})
File.should_receive(:open).with(&blk) do |myobject|
f.should_receive(:write)
blk.should_receive(:yield) (or somethig like that)
end
end
我认为您正在寻找的是产量匹配器,即:
it "should test something" do
# just an example
expect { |b| my_object.start(&b) }.to yield_with_no_args
end
您的另一个选择是使用新的 File 对象存根 :open ,如下所示:
file = File.new
allow(File).to receive(:open) { file }
file.each { |section| expect(section).to receive(:write) }
# run your method