CODEWITHSUNDEEP
rubyrspec
vjdhama
vjdhama

Reputation: 5058

How to write test case for program exit

I have a code snippet in which i am terminating the program when i receive exit input from STDIN using gets. How do i write the rspec test case for the same.

Below is the code snippet.

class CommandProcessor
    attr_accessor :input
    attr_accessor :operation
    def parser
        while true
            input = gets.chomp
            operation = input.split(' ')[0]
            param = input.split(' ')[1]
            if operation.eql? 'exit'
                exit
            end
        end
    end
end

Below is my attempt.

describe "CommandProcessor" do
    it "will exit on input exit" do
        cmd = CommandProcessor.new
        cmd.parser
        expect { it_will_exit }.raise_exception(SystemExit) 
    end
end

UPDATE

I tried Leonid Mirsky's method before and got this error : 

lib/calculator.rb:37:in `parser': undefined method `chomp' for nil:NilClass (NoMethodError)

Upvotes: 0

Views: 143

Answers (1)

Leonid Mirsky
Leonid Mirsky

Reputation: 831

You can stub the gets method on the cmd object itself.

Use the following spec code:

describe "CommandProcessor" do
  it "will exit on input exit" do
    cmd = CommandProcessor.new
    cmd.stub(:gets) {"exit\n"}
    expect { cmd.parser }.to raise_error SystemExit
  end
end

Upvotes: 1

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