Write and Run the Tests for the Models

One of the greatest benefits of developing an application using the TDD approach is that it forces us to think and have a general sense of what we’re building. Here are the main features we aim to develop for the e-library application:

• We’ll only have a single page that showcases all the books in the catalog. We’ll also have a form that enables users to add books to the database.
• The fields for the Catalogue model will include the following:
  • title, which is string.
  • ISBN, which is a string.
  • author, which is a string.
  • price, which is a decimal.
  • availability, which

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