make sure that all nodes are known for AST::Processor. (#698)

test/test_ast_processor.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'helper'
+
+class TestASTProcessor < Minitest::Test
+  LEAF_NODES = %i[
+    sym str int float complex rational
+    true false nil self
+    __FILE__ __LINE__ __ENCODING__
+    cbase regopt zsuper
+    match_with_trailing_comma match_nil_pattern
+    forward_args forwarded_args numargs kwnilarg
+    objc_varargs objc_restarg objc_kwarg
+    ident
+  ].freeze
+
+  def setup
+    @traversible = Parser::AST::Processor
+      .instance_methods(false)
+      .map { |mid| mid.to_s.scan(/\Aon_(.*)/) }
+      .flatten
+      .map(&:to_sym)
+
+    @traversible += LEAF_NODES
+  end
+
+  def test_nodes_are_traversible
+    for_each_node do |node|
+      assert_includes @traversible, node.type
+    end
+  end
+end

test/test_base.rb

@@ -26,6 +26,6 @@ def test_loc_to_node
   def test_loc_dup
     ast = Parser::CurrentRuby.parse('1')
     assert_nil ast.loc.dup.node
-    Parser::AST::Node.new(:root, [], :location => ast.loc)
+    Parser::AST::Node.new(:zsuper, [], :location => ast.loc)
   end
 end