Remove unnecessary `file.rewind`
Add `rc` spec helper method for adding to the freshrc
Restore the original `ENV` after each spec
Rename spec helper method s/add_to_file/file_add/
Rename run_fresh spec helper options

The new option names makes it more obvious that there
are assertions on the exit code.
Return Pathname objects from `*_path` test helpers
Parens
Add shell_sh_marker_lines spec helper
Convert tests for building directories of files
Convert tests for building whole repos
Add comment
Improve shell.sh spec helper method
Convert --bin tests
Make use of `expect_readlink` spec helper
Convert --filter tests
Convert more tests
Convert 'shows source of errors' test
Convert update tests
Convert FRESH_NO_BIN_CHECK tests
Convert FRESH_BIN_PATH test