ruby 中的模拟系统调用 [英] Mock system call in ruby
问题描述
知道模拟 %[] 的方法吗?我正在为进行一些系统调用的代码编写测试,例如:
Know of a way to mock %[]? I'm writing tests for code that makes a few system calls, for example:
def log(file)
%x[git log #{file}]
end
并且希望在测试此方法时避免实际执行系统调用.理想情况下,我想模拟 %x[..] 并断言正确的 shell 命令被传递给它.
and would like to avoid actually executing system calls while testing this method. Ideally I'd like to mock %x[..] and assert that the correct shell command is passed to it.
推荐答案
%x{…}
是 Ruby 内置语法,会实际调用内核方法 反引号 (`).因此,您可以重新定义该方法.由于反引号方法返回在子 shell 中运行 cmd 的标准输出,因此您重新定义的方法应该返回类似的内容,例如字符串.
%x{…}
is Ruby built-in syntax that will actually call Kernel method Backtick (`). So you can redefine that method. As backtick method returns the standard output of running cmd in a subshell, your redefined method should return something similar to that ,for example, a string.
module Kernel
def `(cmd)
"call #{cmd}"
end
end
puts %x(ls)
puts `ls`
# output
# call ls
# call ls
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