Muex.Mutator.CaseClause (Muex v0.8.1)

Elixir-specific mutator that deletes a clause from a case expression.

For a case with two or more clauses, produces one mutation per clause that removes that clause from the branch list. Cases with a single clause are left untouched (there is nothing to delete).

Like StatementDeletion, this is a high-value operator: if removing a branch doesn't fail any test, that branch is either unreachable or its behaviour is unasserted. Patterns and bodies within surviving clauses are still mutated independently by their own mutators via walk/3.