如何模拟Perl的内置反引号运算符? [英] How do I mock Perl's built-in backticks operator?
问题描述
我想对使用反引号的Perl程序进行单元测试。有没有一种方法可以模拟反引号,以便它们可以执行与执行外部命令不同的操作?
I'd like to unit test a Perl program of mine that is using backticks. Is there a way to mock the backticks so that they would do something different from executing the external command?
另一个问题显示了我需要的内容,但使用的是Ruby。不幸的是,我不能选择在该项目中使用Ruby,也不想避免出现反引号。
Another question shows what I need, but in Ruby. Unfortunately, I cannot choose to use Ruby for this project, nor do I want to avoid the backticks.
推荐答案
您可以 * 模拟内置的 readpipe
函数。当遇到反引号或 qx
表达式时,Perl将调用您的模拟函数。
You can* mock the built-in readpipe
function. Perl will call your mock function when it encounters a backticks or qx
expression.
BEGIN {
*CORE::GLOBAL::readpipe = \&mock_readpipe
};
sub mock_readpipe {
wantarray ? ("foo\n") : "foo\n";
}
print readpipe("ls -R");
print `ls -R`;
print qx(ls -R);
$ perl mock-readpipe.pl
foo
foo
foo
* -如果您具有 perl版本5.8.9 或更高版本。
* - if you have perl version 5.8.9 or later.
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