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require File.expand_path(File.dirname(__FILE__)+"/spec_helper.rb")
describe Distribution::Exponential do
shared_examples_for "exponential engine" do
it "should return correct pdf" do
if @engine.respond_to? :pdf
[0.5,1,1.5].each {|l|
1.upto(5) {|x|
@engine.pdf(x,l).should be_within(1e-10).of(l*Math.exp(-l*x))
}
}
else
pending("No #{@engine}.pdf")
end
end
it "should return correct cdf" do
if @engine.respond_to? :cdf
[0.5,1,1.5].each {|l|
1.upto(5) {|x|
@engine.cdf(x,l).should be_within(1e-10).of(1-Math.exp(-l*x))
}
}
else
pending("No #{@engine}.cdf")
end
end
it "should return correct p_value" do
if @engine.respond_to? :p_value
[0.5,1,1.5].each {|l|
1.upto(5) {|x|
pr=@engine.cdf(x,l)
@engine.p_value(pr,l).should be_within(1e-10).of(x)
}
}
else
pending("No #{@engine}.p_value")
end
end
end
describe "singleton" do
before do
@engine=Distribution::Exponential
end
it_should_behave_like "exponential engine"
end
describe Distribution::Exponential::Ruby_ do
before do
@engine=Distribution::Exponential::Ruby_
end
it_should_behave_like "exponential engine"
end
if Distribution.has_gsl?
describe Distribution::Exponential::GSL_ do
before do
@engine=Distribution::Exponential::GSL_
end
it_should_behave_like "exponential engine"
end
end
# if Distribution.has_java?
# describe Distribution::Exponential::Java_ do
# before do
# @engine=Distribution::Exponential::Java_
# end
# it_should_behave_like "exponential engine"
#
# end
# end
describe "rng" do
it "should default to Kernel#rand if no :random is given" do
Random.stub!(:rand)
Random.should_receive(:rand).and_return (0.5)
rng = Distribution::Exponential.rng 1.0
rng.call()
end
it "should use a given rng if one is passed during construction" do
random = double("random")
random.should_receive(:rand).and_return(0.5)
rng = Distribution::Exponential::rng 1.0, :random => random
rng.call()
end
end
end
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