Numeric literal mutators

Returns a ready-made list of numeric_increment() and numeric_decrement() mutators that shift every numeric literal by 1.

Usage

numeric_literals()

Value

A list of mutators.

Details

Use on any file with numeric constants used as thresholds, counts, or offsets. A surviving mutant means tests never verify the exact value of the constant — asserting the precise numeric result rather than a property (e.g. sign) kills it.

See also

vignette("mutators", package = "muttest") for the full mutator table.

vignette("interpreting-results", package = "muttest") for how to diagnose survivors and fix the underlying test weakness.

Examples

numeric_literals()
#> [[1]]
#> Mutator: <n> + 1 → <n> + 1
#> Query: [(float) (integer)] @value
#> 
#> [[2]]
#> Mutator: <n> - 1 → <n> - 1
#> Query: [(float) (integer)] @value
#> 

if (FALSE) { # \dontrun{
plan <- muttest_plan(
  source_files = "R/thresholds.R",
  mutators = numeric_literals()
)
muttest(plan, "tests/testthat")
} # }