CODEWITHSUNDEEP
rubystdin
His
His

Reputation: 6043

Redirect $stdin to string in Ruby

I'm writing a unit test for my class which reads inputs from stdin. In the unit tests, I'm hoping I can redirect the stdin stream to a string.

How can I achieve this?

Upvotes: 2

Views: 455

Answers (1)

Amadan
Amadan

Reputation: 198324

To answer your literal question: unlike the constant STDIN, $stdin is just a global variable, you can replace it with another IO object:

require 'stringio'
$stdin = StringIO.new("foo\nbar")
2.times { puts gets }
# => foo
# => bar

But it is probably a better idea to use a proper mocking framework instead, for example like this.

Upvotes: 3

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