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Contents
describe Integer, "#kaprekar?" do
# A006886
@seq = [1,9,45,55,99,297,703,999,2223,2728,4879,4950,
5050,5292,7272,7777,9999,17344,22222,38962,77778,
82656,95121,99999,142857,148149,181819,187110,
208495,318682,329967,351352,356643,390313,461539,
466830,499500,500500,533170].to_seq
@seq.each do |n|
it "returns true for Kaprekar number #{n}" do
n.should be_kaprekar
end
end
@seq.invert.sample(10).each do |n|
it "returns false for non-Kaprekar number #{n}" do
n.should_not be_kaprekar
end
end
it "returns false for negative numbers" do
[-5, -9, -297, -345].each do |number|
number.should_not be_kaprekar
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems