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Tdd work shop
class ClosedRange
attr_reader :lower_endpoint, :upper_endpoint
def initialize(lower_endpoint, upper_endpoint)
raise IllegalRangeError if lower_endpoint > upper_endpoint
@lower_endpoint = lower_endpoint
@upper_endpoint = upper_endpoint
end
def to_s
"[#{lower_endpoint},#{upper_endpoint}]"
end
def include?(num)
(@lower_endpoint..@upper_endpoint).include?(num)
end
def ==(other_range)
@lower_endpoint == other_range.lower_endpoint && @upper_endpoint == other_range.upper_endpoint
end
def contain?(range)
self.lower_endpoint <= range.lower_endpoint && range.lower_endpoint <= self.upper_endpoint
end
end
class IllegalRangeError < ArgumentError ;end
require 'spec_helper'
describe '整数閉区間を示す' do
context '整数閉区間3-8' do
let(:range) { ClosedRange.new(3, 8) }
it '下端点3を持つ' do
expect(range.lower_endpoint).to eq(3)
end
it '上端点8を持つ' do
expect(range.upper_endpoint).to eq(8)
end
it '文字列表現は"[3,8]"' do
expect(range.to_s).to eq("[3,8]")
end
describe '数値を含む・含まない' do
it '2を含まない' do
expect(range.include?(3)).to be_truthy
end
it '3を含む' do
expect(range.include?(3)).to be_truthy
end
it '6を含む' do
expect(range.include?(6)).to be_truthy
end
it '8を含む' do
expect(range.include?(6)).to be_truthy
end
it '9を含まない' do
expect(range.include?(9)).to be_falsey
end
end
describe '等価判定' do
it '3-8と等価である' do
other_range = ClosedRange.new(3, 8)
expect(range == other_range).to be_truthy
end
it '3-9と等価である' do
other_range = ClosedRange.new(3, 9)
expect(range == other_range).to be_falsey
end
end
describe '包含判定' do
it '4-7を包含する' do
other_range = ClosedRange.new(4, 7)
expect(range.contain?(other_range)).to be_truthy
end
it '2-7を包含しない' do
other_range = ClosedRange.new(2, 7)
expect(range.contain?(other_range)).to be_falsey
end
end
end
context '整数閉区間4-9' do
let(:range) { ClosedRange.new(4, 9) }
it '下端点4を持つ' do
expect(range.lower_endpoint).to eq(4)
end
it '上端点9を持つ' do
expect(range.upper_endpoint).to eq(9)
end
it '文字列表現は"[4,9]"' do
expect(range.to_s).to eq("[4,9]")
end
describe '数値を含む・含まない' do
it '3を含まない' do
expect(range.include?(3)).to be_falsey
end
it '4を含む' do
expect(range.include?(4)).to be_truthy
end
it '9を含む' do
expect(range.include?(9)).to be_truthy
end
it '10を含まない' do
expect(range.include?(10)).to be_falsey
end
end
end
context '整数閉区間8-3' do
let(:range) { ClosedRange.new(8, 3) }
it '上端点より下端点が大きい閉区間を作ることはできない' do
expect{range}.to raise_exception(IllegalRangeError)
end
end
end
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