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Contents?: true
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Versions: 32
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Stored size: 732 Bytes
Contents
describe Integer, "#powerful?" do
POWERFUL = [1,4,8,9,16,25,27,32,36,49,64,72,81,100,108,121,
125,128,144,169,196,200,216,225,243,256,288,289,
324,343,361,392,400,432,441,484,500,512,529,576,
625,648,675,676,729,784,800,841,864,900,961,968,
972,1000]
it "returns true for a powerful number" do
POWERFUL.each do |number|
number.should be_powerful
end
end
it "returns false for a non-powerful number" do
((1..999).to_a - POWERFUL).shuffle.first(10).each do |number|
number.should_not be_powerful
end
end
it "returns false for a negative number" do
(1..999).each do |number|
(-number).should_not be_powerful
end
end
end
Version data entries
32 entries across 32 versions & 1 rubygems