filter_tests: Test Case filtering based on coverage
In reactorlabs/r-tests-old-version:

Description Usage Arguments

This function attemps to filter the test cases for given functions based on code coverage information collected by covr.

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filter_tests(tc_root, tc_result_root, functions, package_path,
  remove_tests = FALSE, exclude_existing_tests = FALSE, compact = FALSE,
  verbose = testr_options("verbose"))

`tc_root`	directory with test cases to filter
`tc_result_root`	directory where the filtered test cases should be copied
`functions`	functions to be filtered aganist
`package_path`	root of the package to be filtered aganist
`remove_tests`	if to delete test cases that don't affect coverage from tc_root
`exclude_existing_tests`	If TRUE, existing tests will be ignored from the code coverage
`compact`	If TRUE, after filtering, tests will be compacted to a file per function
`verbose`	if to show additional infomation during filtering