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describe :process_times, :shared => true do
it "returns a Struct::Tms" do
@object.send(@method).should be_kind_of(Struct::Tms)
end
it "returns current cpu times" do
t = @object.send @method
# Do busy work for a wall-clock interval.
start = Time.now
1 until (Time.now - start) > 0.5
# Ensure times is larger. NOTE that there is no
# guarantee of an upper bound since anything may be
# happening at the OS level, so we ONLY check that at
# least an interval has elapsed. Also, we are assuming
# there is a correlation between wall clock time and
# process time. In practice, there is an observed
# discrepancy often 10% or greater. In other words,
# this is a very fuzzy test.
t2 = @object.send @method
diff = (t2.utime + t2.stime) - (t.utime + t.stime)
diff.should > 0
end
end
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