Finalizando las pruebas de modelo

How to finalize the testing of a model using validations?

In software development, ensuring that a model works correctly is essential. Testing not only ensures functionality, but also validates the persistence and ownership of the model. In this class, we focus on testing models using methods and validations in Ruby on Rails.

How to create a nested context to save the model?

To ensure that a model is correctly saved and validated, it is essential to create a specific context. A nested context is an effective way to separate different test scenarios.

• Use with Parance from Scratch to define a context.
• Set the before Each method to invoke save before each test.

Code example:

 'with Parance from Scratch' context do before(:each) do @task.save endend end

How to ensure that the model is persisted and has precomputed code?

After invoking save, it is important to validate two main aspects of the model:

1. Model persistence: use be_persisted to confirm that the model is saved.
2. Precomputed code: verify the existence of the code using be_present.

Example code:

expect(@task).to be_persistedexpect(@task.code).to be_present.

How to create a test when due date is in the past?

A common scenario is to verify that past dates are not valid for the model. For this, you can create a specific context and use the tap function to modify the attributes of the model.

• Create a new context with due date in the past.
• Use the tap method to directly modify the due_date attribute.

Example code:

context 'with due date in the past' do before(:each) do @task.tap do |t| t.due_date = Date.today - 1 end end end it 'is expected not to be valid' do expect(@task).not_to be_valid endend end end

Running the tests and checking that they fail correctly when the date is earlier than the current date is a crucial step for robust model checking. Tools such as rspec facilitate this process with quick commands.

What is the next step?

Now, having accomplished the necessary validations and ensured the correct functioning of the model, it is suggested that you try applying the same techniques to other models as a user. The concepts of persistence, validation and modification of internal attributes will be equally applicable. As you progress, you will encounter HTTP requests which we will cover in the next class. So don't give up, keep going with curiosity and determination.