Testing R Packages with testthat Modern best practices for R package testing using testthat 3+. Initial Setup Initialize testing with testthat 3rd edition: This creates directory, adds testthat to Suggests with , and creates . File Organization Mirror package structure: - Code in → tests in - Use and to create paired files Special files: - - Helper functions and custom expectations, sourced before tests - - Run during only, not during - - Static test data files accessed via Test Structure Tests follow a three-level hierarchy: File → Test → Expectation Standard Syntax Test descriptions should…