expression

func MutatorComparison ¶

func MutatorComparison(pkg *types.Package, info *types.Info, node ast.Node) []mutator.Mutation

MutatorComparison implements a mutator to change comparisons.

func MutatorContextNil ¶ added in v2.6.1

func MutatorContextNil(_ *types.Package, info *types.Info, node ast.Node) []mutator.Mutation

MutatorContextNil replaces context.Context arguments at call sites with nil. Mirrors ooze's context-cancellation operator.

func MutatorErrorGuard ¶ added in v2.6.1

func MutatorErrorGuard(_ *types.Package, info *types.Info, node ast.Node) []mutator.Mutation

MutatorErrorGuard replaces error-check conditions in if-statements:

if err != nil  →  if false
if err == nil  →  if true

Inspired by gomu's error-handling mutations.

func MutatorLogical ¶

func MutatorLogical(_ *types.Package, _ *types.Info, node ast.Node) []mutator.Mutation

MutatorLogical swaps && and || operators.

func MutatorRemoveTerm ¶

func MutatorRemoveTerm(pkg *types.Package, info *types.Info, node ast.Node) []mutator.Mutation

MutatorRemoveTerm implements a mutator to remove expression terms.

func MutatorStringLiteral ¶ added in v2.6.7

func MutatorStringLiteral(_ *types.Package, _ *types.Info, node ast.Node) []mutator.Mutation

MutatorStringLiteral zeros non-empty string literals in equality and inequality comparisons (== and !=). This tests whether the exact string value matters — e.g. if err.Error() == "not found" where "" would pass when no error occurs but fail when the specific message is expected.

Scoped to comparisons only to avoid high-noise mutations in log messages, metric names, and other strings whose values are not asserted by tests.