...
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"smk-ds.data", at the moment test-smk-ds.dataFrame.o.R, test-smk-ds.dataFrameSort.o.R and test-smk-ds.dataFrameSubset.o.R.
devtools::test(filter="smk-ds.table$")
would run the tests in any file with a matching "smk-ds.table$", at the moment test-smk-ds.table.R, but not test-smk-ds.table1D.R and test-smk-ds.table2D.R.