Calculate test coverage for sets of files

The files in source_files are first sourced into a new environment to define functions to be checked. Then they are instrumented to track coverage and the files in test_files are sourced.

file_coverage(
  source_files,
  test_files,
  line_exclusions = NULL,
  function_exclusions = NULL,
  parent_env = parent.frame()
)

Arguments

source_files	Character vector of source files with function definitions to measure coverage
test_files	Character vector of test files with code to test the functions
line_exclusions	a named list of files with the lines to exclude from each file.
function_exclusions	a vector of regular expressions matching function names to exclude. Example print\\\. to match print methods.
parent_env	The parent environment to use when sourcing the files.