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Testing

推薦工具 good coverage tool.

一個期望一句

Bad:

require 'rspec'

describe 'Calculator' do
  let(:calculator) { Calculator.new }

  it 'performs addition, subtraction, multiplication and division' do
    expect(calculator.calculate('1 + 2')).to eq(3)
    expect(calculator.calculate('4 - 2')).to eq(2)
    expect(calculator.calculate('2 * 3')).to eq(6)
    expect(calculator.calculate('6 / 2')).to eq(3)
  end
end

Good:

require 'rspec'

describe 'Calculator' do
  let(:calculator) { Calculator.new }

  it 'performs addition' do
    expect(calculator.calculate('1 + 2')).to eq(3)
  end

  it 'performs subtraction' do
    expect(calculator.calculate('4 - 2')).to eq(2)
  end

  it 'performs multiplication' do
    expect(calculator.calculate('2 * 3')).to eq(6)
  end

  it 'performs division' do
    expect(calculator.calculate('6 / 2')).to eq(3)
  end
end