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Ensuring Elixir Application Performance with Testing and ExUnit

Creating a SchemaCase for Shared Test Code

Explore how to create a SchemaCase template to centralize shared test functions like valid_params and invalid_params for Ecto schemas. Understand modifying mix.exs to include test files during compilation and refactor tests to use the new case template, ensuring maintainable and reusable test code.

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Case template

Case templates are handy when identifying a pattern for test files that would benefit from shared code. Our refactors on the basic schema tests created two helper functions, valid_params/1 and invalid_params/1, that would be good to move into a common place to be reused by all our schema tests.

We’ll create a case template called SchemaCase and move the helper functions there. Let’s start by creating a new file called testing_ecto/test/schema_case.ex and add the basic structure for a case ...

Elixir
#file path -> testing_ecto/test/schema_case.ex
#add this code at the indicated place mentioned in comments of testing_ecto/test/schema_case.ex
#in the playground widget
  use ExUnit.CaseTemplate
  using do
    quote do
      alias Ecto.Changeset
      import TestingEcto.SchemaCase
    end
  end

For now, ...