mirror of https://github.com/tailix/libkernaux.git
64 lines
1.4 KiB
Ruby
64 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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KernAux::Version.supports_itoa2? and RSpec.describe KernAux, '.itoa2' do
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subject(:itoa2) { described_class.itoa2 number }
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let(:number) { rand((-2**63)..(2**63 - 1)) }
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def sign = number < 0 ? '-' : ''
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it { is_expected.to be_instance_of String }
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it { is_expected.to be_frozen }
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it { is_expected.to eq "#{sign}0b#{number.abs.to_s(2)}" }
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context 'when number is 0' do
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let(:number) { 0 }
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it { is_expected.to eq '0b0' }
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end
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context 'when number is 1' do
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let(:number) { 1 }
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it { is_expected.to eq '0b1' }
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end
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context 'when number is -1' do
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let(:number) { -1 }
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it { is_expected.to eq '-0b1' }
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end
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context 'when number is min int64_t' do
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let(:number) { -2**63 }
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it { is_expected.to eq "-0b#{number.abs.to_s(2)}" }
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end
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context 'when number is max int64_t' do
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let(:number) { 2**63 - 1 }
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it { is_expected.to eq "0b#{number.to_s(2)}" }
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end
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context 'when number is lesser than min uint64_t' do
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let(:number) { -2**63 - 1 }
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specify do
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expect { itoa2 }.to raise_error \
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RangeError, 'bignum too big to convert into `long long\''
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end
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end
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context 'when number is greater than max uint64_t' do
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let(:number) { 2**63 }
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specify do
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expect { itoa2 }.to raise_error \
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RangeError, 'bignum too big to convert into `long long\''
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end
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end
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end
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