Class: Mutineer::Mutators::CollectionMethod

Inherits:
Base
  • Object
show all
Defined in:
lib/mutineer/mutators/collection_method.rb

Overview

Collection / enumerable method-name mutator (Tier-2).

Swaps the method-name token of a call to its semantic opposite, one mutation per occurrence, exactly like the arithmetic/comparison operators.

Constant Summary collapse

REPLACEMENTS =

Method-name swaps. All targets are core-Ruby Enumerable/Array methods so the mutant exercises real behaviour rather than always raising.

ponytail: include? -> exclude? was specced but skipped — exclude? is not core Ruby, so that mutant would always NoMethodError (a weak mutant).

{
  map: "each", each: "map",
  all?: "any?", any?: "all?",
  first: "last", last: "first",
  min: "max", max: "min",
  select: "reject", reject: "select"
}.freeze

Instance Method Summary collapse

Methods inherited from Base

#mutations_for

Instance Method Details

#visit_call_node(node) ⇒ void

This method returns an undefined value.

Visits call nodes and emits collection-method mutations.

Parameters:

  • node (Prism::CallNode) —

    call node to inspect.



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# File 'lib/mutineer/mutators/collection_method.rb', line 29

def visit_call_node(node)
  replacement = REPLACEMENTS[node.name]
  loc = node.message_loc
  if replacement && loc
    @mutations << Mutation.new(
      start_offset: loc.start_offset,
      end_offset: loc.end_offset,
      replacement: replacement,
      operator: :collection_method
    )
  end
  super
end