Increase code coverage rate for proxy (#7727)

Signed-off-by: cai.zhang <cai.zhang@zilliz.com>

internal/proxy/channels_mgr_test.go

@@ -12,6 +12,7 @@
 package proxy
 
 import (
+	"sync"
 	"testing"
 
 	"github.com/milvus-io/milvus/internal/util/uniquegenerator"
@@ -209,3 +210,30 @@ func TestChannelsMgrImpl_removeAllDQLMsgStream(t *testing.T) {
 		assert.Equal(t, nil, err)
 	}
 }
+
+func TestGetAllKeysAndGetAllValues(t *testing.T) {
+	chanMapping := make(map[vChan]pChan)
+	chanMapping["v1"] = "p1"
+	chanMapping["v2"] = "p2"
+
+	t.Run("getAllKeys", func(t *testing.T) {
+		vChans := getAllKeys(chanMapping)
+		assert.Equal(t, 2, len(vChans))
+	})
+
+	t.Run("getAllValues", func(t *testing.T) {
+		pChans := getAllValues(chanMapping)
+		assert.Equal(t, 2, len(pChans))
+	})
+}
+
+func TestDeleteVChansByVID(t *testing.T) {
+	mgr := singleTypeChannelsMgr{
+		id2vchansMtx: sync.RWMutex{},
+		id2vchans: map[int][]vChan{
+			10: {"v1"},
+		},
+	}
+
+	mgr.deleteVChansByVID(10)
+}

internal/proxy/util_test.go

@@ -75,3 +75,33 @@ func TestGetAttrByKeyFromRepeatedKV(t *testing.T) {
 		assert.Equal(t, test.errIsNil, err == nil)
 	}
 }
+
+func TestUtil(t *testing.T) {
+	a, b := 1, 2
+	t.Run("getMax", func(t *testing.T) {
+		ans := getMax(a, b)
+		assert.Equal(t, b, ans)
+
+		ans = getMax(b, a)
+		assert.Equal(t, b, ans)
+	})
+
+	t.Run("getMin", func(t *testing.T) {
+		ans := getMin(a, b)
+		assert.Equal(t, a, ans)
+
+		ans = getMin(b, a)
+		assert.Equal(t, a, ans)
+	})
+}
+
+func TestGetPulsarConfig_Error(t *testing.T) {
+	protocol := "http"
+	ip := "pulsar"
+	port := "17777"
+	url := "/admin/v2/brokers/configuration/runtime"
+
+	ret, err := GetPulsarConfig(protocol, ip, port, url)
+	assert.NotNil(t, err)
+	assert.Nil(t, ret)
+}