Add jsonchecker suite

Author: jhawthorn

test/test_jsonchecker.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+# jsonchecker suite. originally from
+# http://json.org/JSON_checker/
+class TestJsonchecker < Minitest::Test
+  Dir["#{DATA_DIR}/jsonchecker/*.json"].each do |filename|
+    name = File.basename(filename, ".json").gsub(/_EXCLUDE\z/, "")
+    exclude = filename.end_with?("_EXCLUDE.json")
+
+    define_method(:"test_#{name}") do
+      original_json = File.read(filename)
+      if name.start_with?("fail") && !exclude
+        ex = assert_raises RapidJSON::ParseError do
+          RapidJSON.parse(original_json)
+        end
+        re = /JSON parse error: .* \(\d+\)\z/
+        assert_match re, ex.message
+      else
+        assert RapidJSON.parse(original_json)
+      end
+    end
+  end
+end