Sha256: caeda562954fa1be1266020d36485d2ee57b34bb8aa8ece45bc8a06431462cff
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Stored size: 727 Bytes
Contents
describe Integer, "#cube?" do
# A000578
@seq = [0,1,8,27,64,125,216,343,512,729,1000,1331,1728,
2197,2744,3375,4096,4913,5832,6859,8000,9261,
10648,12167,13824,15625,17576,19683,21952,24389,
27000,29791,32768,35937,39304,42875,46656,50653,
54872,59319,64000].to_seq
@seq.each do |n|
it "returns true for perfect cube #{n}" do
n.should be_cube
end
it "returns true for negative perfect cube #{-n}" do
(-n).should be_cube
end
end
@seq.invert.sample(10).each do |n|
it "returns false for non-cube #{n}" do
n.should_not be_cube
end
it "returns false for negative non-cube #{-n}" do
(-n).should_not be_cube
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems