[Page 4] Create unit tests for page 4 functions

[statnmap]

As a maintainer, I'd like to use the last versions of function to update target values for unit tests, so that I can update my source database without breaking the package

Success criteria

• If I update my database, I can update the targets values of the unit tests with a single source()
• After both updates, the package should pass all unit tests accordingly

Technical how

Current behaviour

• Target values for page 4 unit tests is currently based on file "data-raw/altas_simulation.R"
  • If I source("data-raw/altas_simulation.R"), all target outputs are updated for unit tests.

Why is this a problem ?

The current "data-raw/altas_simulation.R" is based on the first version of R scripts provided by the client. After code rework, ThinkR wanted to be sure they could reproduce the same outputs as the client. This has been treated and validated through this issue: #19

Today, fix and improvments of the core of the models are directly made in the functions of the package. This means that outputs can (will) differ from original code on purpose. Hence, we need "data-raw/altas_simulation.R" to be up-to-date with the last version of models.

What to do?

• Modify the content of this "data-raw/altas_simulation.R" file to directly use the functions of the package. Hence, if the core is changed, the outputs are also changed accordingly.
• Warn the developer about this update, because they first need to be sure the outputs are the one really targeted, before updating the targets. To do so, they can use the vignette in "data-raw/be-page4-future.Rmd" to explore the outputs of the model, before running and updated unit tests.