Expected Preparations:

  [FND-CSC]
Test_driven_development 		 
  The units listed above are part of this course and contain important preparatory material.  
Keywords: Code testing in R with the testthat:: package
Objectives:

This unit will …

  • … introduce the testthat package;

  • … teach how to write tests;

  • … demonstrate best practice to organize your tests.

 Outcomes:

After working through this unit you …

  • … can write your own tests;

  • … can organize your tests in files and a testing directory to simplify running them.

Deliverables:

Time management: Before you begin, estimate how long it will take you to complete this unit. Then, record in your course journal: the number of hours you estimated, the number of hours you worked on the unit, and the amount of time that passed between start and completion of this unit.

Journal: Document your progress in your Course Journal. Some tasks may ask you to include specific items in your journal. Don’t overlook these.

Insights: If you find something particularly noteworthy about this unit, make a note in your insights! page.

Evaluation:

NA: This unit is not evaluated for course marks.

Contents

This unit discusses how to put tests in R into practice with the testthat package.

Task…

  • Open RStudio and load the ABC-units R project. If you have loaded it before, choose File ▸ Recent projects ▸ ABC-Units. If you have not loaded it before, follow the instructions in the RPR-Introduction unit.
  • Choose Tools ▸ Version Control ▸ Pull Branches to fetch the most recent version of the project from its GitHub repository with all changes and bug fixes included. This ensures that your data and code remain up to date when we update, or fix bugs.
  • Type init() if requested.
  • Open the file RPR-Unit_testing.R and follow the instructions.

     

    Note: take care that you understand all of the code in the script. Evaluation in this course is cumulative and you may be asked to explain any part of code.

Further Reading

testthat package reference pdf (on CRAN)

Questions, comments

If in doubt, ask! If anything about this contents is not clear to you, do not proceed but ask for clarification. If you have ideas about how to make this material better, let’s hear them. We are aiming to compile a list of FAQs for all learning units, and your contributions will count towards your participation marks.

Improve this page! If you have questions or comments, please post them on the Quercus Discussion board with a subject line that includes the name of the unit.

References

Page ID: RPR-Unit_testing

Author:
Boris Steipe ( <boris.steipe@utoronto.ca> )
Created:
2017-08-05
Last modified:
2022-09-14
Version:
1.1
Version History:
–  1.1 2020 Maintenance
–  1.0 New contents
–  0.1 First stub
Tagged with:
–  Unit
–  Live
–  Links to R course project
–  Has further reading

 

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