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Contents
describe Integer, "#goldbach?" do
it "returns false for numbers less than or equal to 2" do
(0..2).each{|n| n.should_not be_goldbach}
end
it "returns false for any odd number" do
prng = Random.new
100.times do
n = prng.rand(3..100000001)
redo if n.even?
n.should_not be_goldbach
end
end
it "returns true for any even number that is the sum of two primes" do
prng = Random.new
100.times do
n = prng.rand(4..100000001)
redo if n.odd?
n.should be_goldbach
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems