RSpec 要求我在测试通过之前打印对象

Question

我有一个简单的模型测试，我正在测试我的验证，出于某种原因，我需要在测试通过之前打印对象。

以下测试失败（失败输出如下所示）：

RSpec.describe HealthProfile, type: :model do
    let(:client) { create(:client) }
    let(:intro_hp) { create(:health_profile, :no_callbacks, :with_issues, client_id: client.id)}

    describe "should validate that" do

        it "diabetes is required in exit if present in intro" do
            exit_hp = build(:health_profile, :end, :no_callbacks, client_id: client.id)
            exit_hp.valid?

            expect(exit_hp.errors.keys).to include(:diabetic)

        end

    end
end

Failures:

  1) HealthProfile should validate that diabetes is required in exit if present in intro
     Failure/Error: expect(exit_hp.errors.keys).to include(:diabetic)

       expected [:weight_mindset_one, :weight_mindset_two, :weight_mindset_three] to include :diabetic
       Diff:
       @@ -1,2 +1,2 @@
       -[:diabetic]
       +[:weight_mindset_one, :weight_mindset_two, :weight_mindset_three]

     # ./spec/models/health_profile_spec.rb:14:in `block (3 levels) in <top (required)>'

添加打印语句后p intro_hp，同样的测试通过：

RSpec.describe HealthProfile, type: :model do
    let(:client) { create(:client) }
    let(:intro_hp) { create(:health_profile, :no_callbacks, :with_issues, client_id: client.id)}

    describe "should validate that" do

        it "diabetes is required in exit if present in intro" do
            exit_hp = build(:health_profile, :end, :no_callbacks, client_id: client.id)
            p intro_hp
            exit_hp.valid?

            expect(exit_hp.errors.keys).to include(:diabetic)

        end

    end
end

为什么会发生这种情况，我该如何避免？

Answer 1

intro_hp在第一种情况下不会实例化，因为它let是惰性的 - 仅在使用时实例化对象。

您可以使用let!立即实例化对象：

RSpec.describe HealthProfile, type: :model do
    let(:client) { create(:client) }
    let!(:intro_hp) { create(:health_profile, :no_callbacks, :with_issues, client_id: client.id)}

相关说明 - 您不必打印它，您可以使用它：

        it "diabetes is required in exit if present in intro" do
            intro_hp
            exit_hp = build(:health_profile, :end, :no_callbacks, client_id: client.id)
            exit_hp.valid?

            expect(exit_hp.errors.keys).to include(:diabetic)

        end