test(dwh-migration): setup test suite to validate DWH migration

[droomelotdegendt]

Goal

Add a dedicated test suite designed to verify package behavior during DWH migration.

These tests target a robust static vallidation subset of locked locations (locations that are unlikely to have data changes in the future) with high observation counts to ensure that our core query pipelines (get_locs(), get_xg3(), and get_chem()) maintain the same output over database updates.

NOTE: this subset was created in collaboration with the Databeheer team (who performed the actual database migration).

Key Changes

• tests/testthat/test-dwh-migration: Introduction of new testing file with tests that evaluate all functions that create database queries.
• test.run_dwh_migration: New toggle option to ensure the test can be isolated and ignored when unnecessary.
• README.me: Updated the testing documentation to guide developers on how to run these migration tests.

How to run

By default, these tests are skipped. When verifying the data warehouse migration, run the following:

# 1. Enable migration tests
options(test.run_dwh_migration = TRUE)

# 2. Load the package
devtools::load_all()

# 3. Create testing connection
test_con <- connect_watina()

# 4. Run the suite
devtools::test(filter = "dwh-migration")

[florisvdh]

Very nice work, thank you!! 👌

[florisvdh]

🥇

Again, the target branch is yours so merging is up to you!