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require 'spec_helper'
require 'enumerable/statistics'
require 'delegate'
RSpec.describe Hash do
describe '#sum' do
subject(:sum) { enum.sum(init, &block) }
let(:init) { 0 }
let(:block) { nil }
with_enum({}) do
it_is_int_equal(0)
with_init(0.0) do
it_is_float_equal(0.0)
end
context 'with a conversion block' do
it 'does not call the conversion block' do
expect { |b|
enum.sum(&b)
}.not_to yield_control
end
end
end
with_enum({ a: 3 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_int_equal(3)
with_init(0.0) do
it_is_float_equal(3.0)
end
end
end
with_enum({ a: 3, b: 5 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_int_equal(8)
end
end
with_enum({ a: 3, b: 5, c: 7 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_int_equal(15)
end
end
with_enum({ a: 3, b: Rational(5) }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_rational_equal(Rational(8))
end
end
with_enum({ a: 3, b: 5, c: 7.0 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(15.0)
end
end
with_enum({ a: 3, b: Rational(5), c: 7.0 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(15.0)
end
end
with_enum({ a: 3, b: Rational(5), c: Complex(0, 1) }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_complex_equal(Complex(8, 1))
end
end
with_enum({ a: 3, b: Rational(5), c: 7.0, d: Complex(0, 1) }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_complex_equal(Complex(15.0, 1))
end
end
with_enum({ a: 3.5, b: 5 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(8.5)
end
end
with_enum({ a: 2, b: 8.5 }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(10.5)
end
end
with_enum({ a: Rational(1, 2), b: Rational(1, 3) }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_rational_equal(Rational(5, 6))
end
end
with_enum({ a: 2.0, b: Complex(0, 3.0) }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_complex_equal(Complex(2.0, 3.0))
end
end
it 'calls a block for each item once' do
yielded = []
three = SimpleDelegator.new(3)
hash = { a: 1, b: 2.0, c: three }
expect(hash.sum {|k, x| yielded << x; x * 2 }).to eq(12.0)
expect(yielded).to eq(hash.values)
end
with_enum({ a: Object.new }) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
specify do
expect { subject }.to raise_error(TypeError)
end
end
end
large_number = 100_000_000
small_number = 1e-9
until (large_number + small_number) == large_number
small_number /= 10
end
with_enum Hash[[*:a..:k].zip([large_number, *[small_number]*10])] do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(large_number + small_number*10)
end
end
with_enum Hash[[*:a..:k].zip([Rational(large_number, 1), *[small_number]*10])] do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(large_number + small_number*10)
end
end
with_enum Hash[[*:a..:l].zip([small_number, Rational(large_number, 1), *[small_number]*10])] do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
it_is_float_equal(large_number + small_number*11)
end
end
with_enum({ a: "a", b: "b", c: "c"}) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
with_init("") do
it { is_expected.to eq("abc") }
end
end
end
with_enum({ a: [1], b: [[2]], c: [3]}) do
with_conversion ->((_, v)) { v }, '(k, v) -> v' do
with_init([]) do
it { is_expected.to eq([1, [2], 3]) }
end
end
end
with_enum({ 1 => 2, 3 => 4, 5 => 6 }) do
with_conversion ->((k, v)) { k * v }, '(k, v) -> k * v' do
it_is_int_equal(44)
end
end
end
end
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