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Contents
describe Integer, "#perfect_power?" do
PERFECT_POWERS = [1, 4,8,9,16,25,27,32,36,49,64,81,100,121,125,128,
144,169,196,216,225,243,256,289,324,343,361,400,
441,484,512,529,576,625,676,729,784,841,900,961,
1000,1024,1089,1156,1225,1296,1331,1369,1444,1521,
1600,1681,1728,1764]
it "returns true for perfect powers" do
PERFECT_POWERS.each do |power|
power.should be_perfect_power
end
end
it "returns false for imperfect powers" do
((1..1764).to_a - PERFECT_POWERS).each do |power|
power.should_not be_perfect_power
end
end
it "returns false for negative numbers" do
(1..1764).each do |power|
(-power).should_not be_perfect_power
end
end
end
Version data entries
36 entries across 36 versions & 1 rubygems