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Size: 625 Bytes
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Stored size: 625 Bytes
Contents
describe Integer, "#centered_triangular?" do
# A005448
@seq = [1,4,10,19,31,46,64,85,109,136,166,199,235,274,
316,361,409,460,514,571,631,694,760,829,901,976,
1054,1135,1219,1306,1396,1489,1585,1684,1786,1891,
1999,2110,2224,2341,2461,2584,2710,2839,2971,3106,
3244,3385,3529].to_seq
@seq.each do |n|
it "returns true for centered triangular number #{n}" do
n.should be_centered_triangular
end
end
@seq.invert.sample(10).each do |n|
it "returns false for non-centered-triangular number #{n}" do
n.should_not be_centered_triangular
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems