If you wish to run just one, or possible a small number of testthat tests you can use the filter argument of the devtools::test method
For example,
devtools::test(filter="smk-ds.dataFrame.o")
would run only the tests in test-smk-ds.dataFrame.o.R, whereas
devtools::test(filter="smk-ds.data")
would run the tests in any file with a matching name, at the moment test-smk-ds.dataFrame.o.R, test-smk-ds.dataFrameSort.o.R and test-smk-ds.dataFrameSubset.o.R.
