新增go modules支持，自行管理第三方包依赖，方便开发者使用

third/github.com/Shopify/sarama/metadata_request_test.go

@@ -0,0 +1,76 @@
+package sarama
+
+import "testing"
+
+var (
+	metadataRequestNoTopicsV0 = []byte{
+		0x00, 0x00, 0x00, 0x00}
+
+	metadataRequestOneTopicV0 = []byte{
+		0x00, 0x00, 0x00, 0x01,
+		0x00, 0x06, 't', 'o', 'p', 'i', 'c', '1'}
+
+	metadataRequestThreeTopicsV0 = []byte{
+		0x00, 0x00, 0x00, 0x03,
+		0x00, 0x03, 'f', 'o', 'o',
+		0x00, 0x03, 'b', 'a', 'r',
+		0x00, 0x03, 'b', 'a', 'z'}
+
+	metadataRequestNoTopicsV1 = []byte{
+		0xff, 0xff, 0xff, 0xff}
+
+	metadataRequestAutoCreateV4   = append(metadataRequestOneTopicV0, byte(1))
+	metadataRequestNoAutoCreateV4 = append(metadataRequestOneTopicV0, byte(0))
+)
+
+func TestMetadataRequestV0(t *testing.T) {
+	request := new(MetadataRequest)
+	testRequest(t, "no topics", request, metadataRequestNoTopicsV0)
+
+	request.Topics = []string{"topic1"}
+	testRequest(t, "one topic", request, metadataRequestOneTopicV0)
+
+	request.Topics = []string{"foo", "bar", "baz"}
+	testRequest(t, "three topics", request, metadataRequestThreeTopicsV0)
+}
+
+func TestMetadataRequestV1(t *testing.T) {
+	request := new(MetadataRequest)
+	request.Version = 1
+	testRequest(t, "no topics", request, metadataRequestNoTopicsV1)
+
+	request.Topics = []string{"topic1"}
+	testRequest(t, "one topic", request, metadataRequestOneTopicV0)
+
+	request.Topics = []string{"foo", "bar", "baz"}
+	testRequest(t, "three topics", request, metadataRequestThreeTopicsV0)
+}
+
+func TestMetadataRequestV2(t *testing.T) {
+	request := new(MetadataRequest)
+	request.Version = 2
+	testRequest(t, "no topics", request, metadataRequestNoTopicsV1)
+
+	request.Topics = []string{"topic1"}
+	testRequest(t, "one topic", request, metadataRequestOneTopicV0)
+}
+
+func TestMetadataRequestV3(t *testing.T) {
+	request := new(MetadataRequest)
+	request.Version = 3
+	testRequest(t, "no topics", request, metadataRequestNoTopicsV1)
+
+	request.Topics = []string{"topic1"}
+	testRequest(t, "one topic", request, metadataRequestOneTopicV0)
+}
+
+func TestMetadataRequestV4(t *testing.T) {
+	request := new(MetadataRequest)
+	request.Version = 4
+	request.Topics = []string{"topic1"}
+	request.AllowAutoTopicCreation = true
+	testRequest(t, "one topic", request, metadataRequestAutoCreateV4)
+
+	request.AllowAutoTopicCreation = false
+	testRequest(t, "one topic", request, metadataRequestNoAutoCreateV4)
+}