covr supports a couple of different ways of excluding some or all of a file.

## Line Exclusions

The line_exclusions argument to package_coverage() can be used to exclude some or all of a file. This argument takes a list of filenames or named ranges to exclude.

## Function Exclusions

Alternatively function_exclusions can be used to exclude R functions based on regular expression(s). For example print\\.* can be used to exclude all the print methods defined in a package from coverage.

In addition you can exclude lines from the coverage by putting special comments in your source code. This can be done per line or by specifying a range. The patterns used can be specified by the exclude_pattern, exclude_start, exclude_end arguments to package_coverage() or by setting the global options covr.exclude_pattern, covr.exclude_start, covr.exclude_end.

## Examples

# NOT RUN {
# exclude whole file of R/test.R
package_coverage(exclusions = "R/test.R")

# exclude lines 1 to 10 and 15 from R/test.R
package_coverage(line_exclusions = list("R/test.R" = c(1:10, 15)))

# exclude lines 1 to 10 from R/test.R, all of R/test2.R
package_coverage(line_exclusions = list("R/test.R" = 1:10, "R/test2.R"))

# exclude all print and format methods from the package.
package_coverage(function_exclusions = c("print\\.", "format\\."))

# single line exclusions
f1 <- function(x) {
x + 1 # nocov
}

# ranged exclusions
f2 <- function(x) { # nocov start
x + 2
} # nocov end
# }