Condition mutation mutators

Returns a ready-made list of negate_condition() and remove_condition_negation() mutators covering both directions of condition logic: wrapping a plain condition in !(...) and stripping ! from an already-negated condition.

Usage

condition_mutations()

Value

A list of mutators.

Details

Use on any file with non-trivial if/while conditions. Surviving mutants mean the branch outcome was never tested with inputs that cross the boundary — adding a test where the condition flips from TRUE to FALSE kills them.

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

condition_mutations()
#> [[1]]
#> Mutator: <condition> → !(<condition>)
#> Query: [(if_statement condition: (_) @cond) (while_statement condition: (_) @cond)]
#> 
#> [[2]]
#> Mutator: !<condition> → <condition>
#> Query: [(if_statement condition: (_) @cond) (while_statement condition: (_) @cond)]
#> 

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