public static void GetSubjectVersions(Config config) { var topicName = Guid.NewGuid().ToString(); var testSchema1 = "{\"type\":\"record\",\"name\":\"User\",\"namespace\":\"Confluent.Kafka.Examples.AvroSpecific" + "\",\"fields\":[{\"name\":\"name\",\"type\":\"string\"},{\"name\":\"favorite_number\",\"type\":[\"i" + "nt\",\"null\"]},{\"name\":\"favorite_color\",\"type\":[\"string\",\"null\"]}]}"; var testSchema2 = // compatible with testSchema1 "{\"type\":\"record\",\"name\":\"User\",\"namespace\":\"Confluent.Kafka.Examples.AvroSpecific" + "\",\"fields\":[{\"name\":\"name\",\"type\":\"string\"},{\"name\":\"favorite_number\",\"type\":[\"i" + "nt\",\"null\"]},{\"name\":\"favorite_color\",\"type\":[\"string\",\"null\"]}," + "{\"name\":\"favorite_shape\",\"type\":[\"string\",\"null\"], \"default\": \"square\"}]}"; var sr = new CachedSchemaRegistryClient(new SchemaRegistryConfig { Url = config.Server }); var subject = sr.ConstructValueSubjectName(topicName); var id1 = sr.RegisterSchemaAsync(subject, testSchema1).Result; var id2 = sr.RegisterSchemaAsync(subject, testSchema2).Result; var versions = sr.GetSubjectVersionsAsync(subject).Result; Assert.Equal(versions.Count, 2); }