Class: Mutineer::Mutators::LiteralMutation

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

Overview

Literal-fuzzing operator (Tier 2, OFF by default). Integers emit up to three mutations (0, 1, n+1) with no-op guards for 0 and 1; strings collapse to "" unless already empty. One mutation per emitted candidate (R11).

Clean-room: from the spec's operator description, not the mutant gem.

Instance Method Summary collapse

Methods inherited from Base

#mutations_for

Instance Method Details

#visit_integer_node(node) ⇒ Object 



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# File 'lib/mutineer/mutators/literal_mutation.rb', line 13

def visit_integer_node(node)
  n = node.value
  emit(node.location, "0") unless n.zero?
  emit(node.location, "1") unless n == 1
  emit(node.location, (n + 1).to_s)
  super
end

#visit_string_node(node) ⇒ Object 



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# File 'lib/mutineer/mutators/literal_mutation.rb', line 21

def visit_string_node(node)
  loc = node.location
  token = @source.byteslice(loc.start_offset...loc.end_offset)
  emit(loc, '""') unless token == '""' || token == "''" || node.unescaped.empty?
  super
end