[ruby/yarp] Test all methods of the YARP Ruby API

https://github.com/ruby/yarp/commit/a723f40baf

test/ruby_api_test.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require "yarp_test_helper"
+
+class YARPRubyAPITest < Test::Unit::TestCase
+  def test_ruby_api
+    filepath = __FILE__
+    source = File.read(filepath, binmode: true, external_encoding: Encoding::UTF_8)
+
+    assert_equal YARP.lex(source, filepath).value, YARP.lex_file(filepath).value
+
+    assert_equal YARP.dump(source, filepath), YARP.dump_file(filepath)
+
+    serialized = YARP.dump(source, filepath)
+    ast1 = YARP.load(source, serialized).value
+    ast2 = YARP.parse(source, filepath).value
+    ast3 = YARP.parse_file(filepath).value
+
+    assert_equal_nodes ast1, ast2
+    assert_equal_nodes ast2, ast3
+  end
+end