Class: Evilution::Mutator::Operator::PatternPredicate Private

Inherits:
Base
  • Object
show all
Defined in:
lib/evilution/mutator/operator/pattern_predicate.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Replace a one-line pattern match with false: x in Integer becomes false.

The mutant differs from the original only on inputs the pattern actually matches, so a survivor means no test ever feeds it a matching value -- the true path of the predicate is unexercised.

Only Prism::MatchPredicateNode is mutated. Its sibling MatchRequiredNode (x => Integer) raises NoMatchingPatternError rather than returning a boolean, so false would not stand in for it.

Instance Attribute Summary

Attributes inherited from Base

#mutations

Instance Method Summary collapse

Methods inherited from Base

#call, clear_parse_cache!, #initialize, operator_name, parsed_tree_for

Constructor Details

This class inherits a constructor from Evilution::Mutator::Base

Instance Method Details

#visit_match_predicate_node(node) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/evilution/mutator/operator/pattern_predicate.rb', line 16

def visit_match_predicate_node(node)
  location = node.location

  add_mutation(
    offset: location.start_offset,
    length: location.length,
    replacement: "false",
    node: node
  )

  super
end