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Рекомендации по разработке на Ruby — Тестирование граничных случаев

Фрагмент из «Рекомендации по разработке на Ruby»: Тестирование граничных случаев.

ruby rubyencyclopedia101 embed URL статья в энциклопедии
Ruby main.rb 
describe "#discounted_price" do
  it "returns zero for 100% discount" do
    product = Product.new(price: 100)
    expect(product.discounted_price(100)).to eq(0)
  end

  it "returns original price for 0% discount" do
    product = Product.new(price: 100)
    expect(product.discounted_price(0)).to eq(100)
  end

  it "handles negative discount as zero" do
    product = Product.new(price: 100)
    expect(product.discounted_price(-10)).to eq(100)
  end
end
describe "#discounted_price" do
  it "returns zero for 100% discount" do
    product = Product.new(price: 100)
    expect(product.discounted_price(100)).to eq(0)
  end

  it "returns original price for 0% discount" do
    product = Product.new(price: 100)
    expect(product.discounted_price(0)).to eq(100)
  end

  it "handles negative discount as zero" do
    product = Product.new(price: 100)
    expect(product.discounted_price(-10)).to eq(100)
  end
end