On Jan 16, 2011, at 8:29 PM, Evan wrote:
> 1) Know of any guides to writing performance tests using Rspec?
There's nothing built in as of yet, but you can do this pretty easily:
<code>
require 'benchmark'
RSpec::Matchers.define :take_less_than do |n|
chain :seconds do; end
match do |block|
@elapsed = Benchmark.realtime do
block.call
end
@elapsed <= n
end
end
describe "addition" do
it "runs fast" do
expect do
10000.times { 1 + 2 }
end.to take_less_than(0.001).seconds
end
end
</code>
> 2) Does Rspec have the capability to run specs in benchmarking or
> profiling mode similar to the way Rails has performance tests that run
> in these modes (http://guides.rubyonrails.org/
> performance_testing.html)?
There is a --profile command line switch:
rspec spec --profile
which gives you the 10 slowest running examples, but that includes time to run
all the before, after, and around hooks as well. My guess is you'd be better
off with the matcher above.
HTH,
David
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