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Contents
describe Integer, "#hexagonal?" do
# A000384
@seq = [0,1,6,15,28,45,66,91,120,153,190,231,276,325,378,
435,496,561,630,703,780,861,946,1035,1128,1225,
1326,1431,1540,1653,1770,1891,2016,2145,2278,2415,
2556,2701,2850,3003,3160,3321,3486,3655,3828,4005,
4186,4371,4560].to_seq
@seq.each do |n|
it "returns true for hexagonal number #{n}" do
n.should be_hexagonal
end
end
@seq.invert.sample(10).each do |n|
it "returns false for non-hexagonal number #{n}" do
n.should_not be_hexagonal
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems