我可以使用 RSpec 来模拟 stdin/stdout 来测试控制台读取吗?写? [英] Can I use RSpec to mock stdin/stdout to test console reads & writes?

问题描述

我的 Ruby 程序从 stdin 读取行并使用 puts 打印到 stdout(终端).我可以使用 RSpec 来测试读写吗?我可以像在 stdin 中编写的那样向我的程序注入一个字符串，同时检查输出吗?

My Ruby program reads lines from stdin and uses puts to print to stdout (the terminal). Can I use RSpec to test the reads and writes? Can I inject a string to my program like it was written in stdin and at the same time check the output?

line = STDIN.read.chomp.split

此外，我在循环中进行读取和写入，直到 line[0] 是退出".我可以在循环运行时测试还是应该调用 subject.read_in 和 subject.write_out?

Also, I have the reads and writes in a loop, until line[0] is "quit". Can I test while the loop is running or should I call subject.read_in and subject.write_out?

推荐答案

您可以使用模拟并通过在 and_return() 方法中列出多个值来多次调用该方法.这些将按给定的顺序返回，每次调用时返回一个.

You can use mocks and have the method called more than once by listing multiple values in the and_return() method. These will be returned, one on each call, in the order given.

STDIN.should_receive(:read).and_return("Your string")

STDIN.should_receive(:read).and_return("value1", "value2", "value3")

你可以用 STDOUT 做类似的事情:

You can do similar things with STDOUT:

STDOUT.should_receive(:puts).with("string")

有关详细信息，请参阅 RSpec 模拟文档.

See the RSpec mocking documentation for more information.

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