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require 'spec_helper'
RSpec.describe Array, '#percentile' do
let(:ary) { [] }
let(:args) { [0, 25, 50, 75, 100] }
subject(:percentile) { ary.percentile(args) }
with_array [] do
specify do
expect { percentile }.to raise_error(ArgumentError)
end
end
with_array [1] do
specify do
expect(percentile).to eq([1.0, 1.0, 1.0, 1.0, 1.0])
end
end
with_array [1, 2, 3] do
specify do
expect(percentile).to eq([1.0, 1.5, 2.0, 2.5, 3.0])
end
end
with_array [1, 2] do
let(:args) { 50 }
specify do
expect(percentile).to eq(1.5)
end
end
with_array [1, 2] do
let(:args) { [50] }
specify do
expect(percentile).to eq([1.5])
end
end
with_array [1, 2, 3] do
let(:args) { [100, 25, 0, 75, 50] }
specify do
expect(percentile).to eq([3.0, 1.5, 1.0, 2.5, 2.0])
end
end
with_array [1, Float::NAN, 3] do
let(:args) { [100, 25] }
specify do
expect(percentile).to match([be_nan, be_nan])
end
end
with_array [1, nil, 3] do
let(:args) { [100, 25] }
specify do
expect(percentile).to match([be_nan, be_nan])
end
end
end
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