CODEWITHSUNDEEP
ruby-on-railsrubyrspecstub
aayushgx
aayushgx

Reputation: 80

What are RSPEC Stubs? By example

I just can't seem to get a hold of what exactly stubs are.

Could someone just explain what the following RSPEC code is supposed to do. And what is the benefit of using stub here?

require "performance_monitor"

require "time"  # loads up the Time.parse method -- do NOT create time.rb!

describe "Performance Monitor" do
  before do
    @eleven_am = Time.parse("2011-1-2 11:00:00")
  end

  it "takes exactly 1 second to run a block that sleeps for 1 second (with stubs)" do
    fake_time = @eleven_am
    Time.stub(:now) { fake_time }
    elapsed_time = measure do
      fake_time += 60  # adds one minute to fake_time
    end
    elapsed_time.should == 60
  end

end

I think I'll be able to understand with an example.

Upvotes: 0

Views: 237

Answers (2)

rindek
rindek

Reputation: 126

Note that stub will only 'override' this method only in this one spec. Other specs will respond do Time.now properly

Upvotes: 0

Rajarshi Das
Rajarshi Das

Reputation: 12320

stub is used here for override the function now of Time so here instead of return current time which you got from Time.now after stub it will return fake_time

Upvotes: 3

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