Refactor tests with JsonSerializerOptions#664

mpreyskurantov merged 1 commit intoDevExpress:masterDevExpress/DevExtreme.AspNet.Data:masterfrom

mpreyskurantov:stj-converters-default-write-testsmpreyskurantov/DevExtreme.AspNet.Data:stj-converters-default-write-testsCopy head branch name to clipboard