Class: Mutineer::Mutators::StatementRemoval

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

Overview

Statement-removal operator: replace each non-final method statement with "nil". Tests whether the suite detects a missing side effect. The final expression is always skipped — replacing the return value with nil is the M5 return-nil operator's distinct concern (KTD-1). A body with < 2 statements has no non-final statement, so it generates nothing.

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_statements_node(node) ⇒ Object 



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# File 'lib/mutineer/mutators/statement_removal.rb', line 15

def visit_statements_node(node)
  stmts = node.body
  return if stmts.length < 2

  stmts[0...-1].each do |stmt|
    loc = stmt.location
    @mutations << Mutation.new(
      start_offset: loc.start_offset,
      end_offset: loc.end_offset,
      replacement: "nil",
      operator: :statement_removal
    )
  end
  # ponytail: no super — recursing into a nested StatementsNode would
  # re-emit removals already covered at the top level and double-count.
  # Each subject's body is visited once.
end