I'm writing a Mastermind game in Ruby and in the constructor of the class 'Game' I want to use gets.chomp to ask the user for its name. Pretty easy, but where I run into trouble is when testing this class in RSpec, but I can't seem to properly stub out 'gets' and 'puts', because they are in the constructor not a regular method.
class Game
def initialize
puts "Please enter your name:"
@player = Player.new(gets.chomp)
end
end
describe Game do
Game.stub(:gets).and_return("Create Code AI")
Game.stub(:puts)
subject(:game) { Game.new }
describe "#new" do
its("player.name") { eql("Create Code AI") }
end
end
class Player
attr_reader :name
def initialize(name)
@name = name
end
end
I've also tried putting the stubs into 'before' and 'let' blocks amongst other things, but nothing seems to work. Any help is appreciated!
I have a method which captures stdin and stdout to help with the testing in cases like these:
require 'stringio'
module Kernel
def capture_stdout(console_input = '')
$stdin = StringIO.new(console_input)
out = StringIO.new
$stdout = out
yield
return out.string.strip
ensure
$stdout = STDOUT
$stdin = STDIN
end
end
Now, let's assume I want to test a method that interacts with stdin/stdout:
def greet
name = gets
puts "Welcome, #{name}!"
end
I would write the following test:
require 'rspec/autorun'
RSpec.describe '#say_name' do
it 'prints name correctly' do
input = 'Joe'
result = capture_stdout(input) do
greet
end
expect(result).to eql 'Welcome, Joe!'
end
end
I presented the example above to illustrate how to test both console input and output.
In your case, the test could look like this:
describe Game do
subject(:game) do
capture_stdout('Create Code AI') { return Game.new }
end
describe "#new" do
its("player.name") { eql("Create Code AI") }
end
end
Note: In order for this to work, #player
should be an accessible member of Game
. So, you may want to add this to your Game
class:
attr_reader :player
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