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Simple BDD API for testing asynchronous Ruby/EventMachine code
(c) 2008 Aman Gupta (tmm1)
em-spec can be used with either bacon, test unit or rspec.
=Rspec
There are two ways to use the Rspec extension. To use it as a helper, include EM::SpecHelper in your describe block. You then use the em method to wrap your evented test code. Inside the em block, you must call #done after your expectations. Everything works normally otherwise.
require "em-spec/rspec"
describe EventMachine do
include EM::SpecHelper
it "works normally when not using #em" do
1.should == 1
end
it "makes testing evented code easy with #em" do
em do
start = Time.now
EM.add_timer(0.5){
(Time.now-start).should be_close( 0.5, 0.1 )
done
}
end
end
end
The other option is to include EM::Spec in your describe block. This will patch Rspec so that all of your examples run inside an em block automatically:
require "em-spec/rspec"
describe EventMachine do
include EM::Spec
it "requires a call to #done every time" do
1.should == 1
done
end
it "runs test code in an em block automatically" do
start = Time.now
EM.add_timer(0.5){
(Time.now-start).should be_close( 0.5, 0.1 )
done
}
end
end
=Bacon
The API is identical to Bacon, except that you must explicitly call 'done' after all the current behavior's assertions have been made:
require 'em-spec/bacon'
EM.describe EventMachine do
should 'have timers' do
start = Time.now
EM.add_timer(0.5){
(Time.now-start).should.be.close 0.5, 0.1
done
}
end
should 'have periodic timers' do
num = 0
start = Time.now
timer = EM.add_periodic_timer(0.5){
if (num += 1) == 2
(Time.now-start).should.be.close 1.0, 0.1
EM.__send__ :cancel_timer, timer
done
end
}
end
end
=Test::Unit
There are two ways to use the Test::Unit extension. To use it as a helper, include EM::TestHelper in your test unit class. You then use the em method to wrap your evented test code. Inside the em block, you must call #done after your expectations. Everything works normally otherwise.
require 'em-spec/test'
class EmSpecHelperTest < Test::Unit::TestCase
include EventMachine::TestHelper
def test_trivial
em do
assert_equal 1, 1
done
end
end
end
The other option is to include EM::Test in your test class. This will patch Test::Unit so that all of your examples run inside an em block automatically:
require 'em-spec/test'
class EmSpecTest < Test::Unit::TestCase
include EventMachine::Test
def test_timer
start = Time.now
EM.add_timer(0.5){
assert_in_delta 0.5, Time.now-start, 0.1
done
}
end
end
Resources:
* Git repository: http://github.com/tmm1/em-spec
* Bacon: http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/30b07b651b0662fd
* Initial announcement: http://groups.google.com/group/eventmachine/browse_thread/thread/8b4e7ead72f9d013
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