Mutation Operators Supported by mutator

This help page lists the mutation operators that the mutator package supports for mutation testing in R.

Details

The following mutation operators can be applied to R code:

• Arithmetic operators: + <-> -, and * <-> /

• Comparison operators: == <-> !=, < <-> >, and <= <-> >=

• Logical operators: \& <-> |, && <-> ||, removes !, and negates if / while conditions

• Assignment and call values: replaces assignment right-hand sides and ordinary function calls with 42

• Scalar constants: replaces numeric zero with 42, numeric non-zero values with 0, constants with a typed NA, and constants with NULL

• Returns: replaces non-constant direct return() values with NULL, for example return(x) -> return(NULL)

• Deletions: removes statements inside { ... } blocks and, as a fallback, valid source lines

Direct literal return values are not rewritten by the return-to-NULL mutation; for example, return(1) is left alone by that mutation.

Author

Assanali Amandykov and Pierre Donat-Bouillud