def initialize(klass_name = nil, method_name = nil,
nodes = Heckle::MUTATABLE_NODES, reporter = Reporter.new)
super()
@klass_name = klass_name
@method_name = method_name.intern if method_name
@klass = klass_name.to_class
@method = nil
@reporter = reporter
self.strict = false
self.auto_shift_type = true
self.expected = Sexp
@mutatees = Hash.new
@mutation_count = Hash.new 0
@node_count = Hash.new 0
@count = 0
@mutatable_nodes = nodes
@mutatable_nodes.each {|type| @mutatees[type] = [] }
@failures = []
@mutated = false
grab_mutatees
@original_tree = current_tree.deep_clone
@original_mutatees = mutatees.deep_clone
end