correctness test your own code?

[tdhock]

maybe write some tests to make sure that your mem_compare function returns a data frame with a certain number of row and certain row names?

either clone an existing repository as a part of the test framework (e.g. hadley/stringr) or use git2r to make a simple repository that you can run your code on.

[analyticalmonk]

I have written a basic test using testthat to begin with.
Link to commit: 21d6620

[tdhock]

for the function that generates a web page, test that the web page contains one image for every test.