Use ruby-syntax-fixtures

Author: kddnewton

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "spec"]
 	path = spec/ruby
 	url = git@github.com:ruby/spec.git
+[submodule "test/ruby-syntax-fixtures"]
+	path = test/ruby-syntax-fixtures
+	url = https://github.com/ruby-syntax-tree/ruby-syntax-fixtures

test/ruby-syntax-fixtures

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+module SyntaxTree
+  class RubySyntaxFixturesTest < Minitest::Test
+    Dir[File.expand_path("ruby-syntax-fixtures/**/*.rb", __dir__)].each do |file|
+      define_method "test_ruby_syntax_fixtures_#{file}" do
+        refute_nil(SyntaxTree.parse(SyntaxTree.read(file)))
+      end
+    end
+  end
+end