Add unittest for proxy_client_manager (#7729)

Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

internal/rootcoord/proxy_client_manager_test.go

+// Copyright (C) 2019-2020 Zilliz. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software distributed under the License
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+// or implied. See the License for the specific language governing permissions and limitations under the License.
+
+package rootcoord
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/milvus-io/milvus/internal/types"
+	"github.com/milvus-io/milvus/internal/util/sessionutil"
+	"github.com/stretchr/testify/assert"
+	clientv3 "go.etcd.io/etcd/client/v3"
+)
+
+func TestProxyClientManager_GetProxyClients(t *testing.T) {
+	Params.Init()
+
+	core, err := NewCore(context.Background(), nil)
+	assert.Nil(t, err)
+	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
+	assert.Nil(t, err)
+	core.etcdCli = cli
+
+	core.SetNewProxyClient(
+		func(se *sessionutil.Session) (types.Proxy, error) {
+			return nil, errors.New("failed")
+		},
+	)
+
+	pcm := newProxyClientManager(core)
+
+	session := &sessionutil.Session{
+		ServerID: 100,
+		Address:  "localhost",
+	}
+
+	sessions := []*sessionutil.Session{session}
+	pcm.GetProxyClients(sessions)
+}
+
+func TestProxyClientManager_AddProxyClient(t *testing.T) {
+	Params.Init()
+
+	core, err := NewCore(context.Background(), nil)
+	assert.Nil(t, err)
+	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
+	assert.Nil(t, err)
+	core.etcdCli = cli
+
+	core.SetNewProxyClient(
+		func(se *sessionutil.Session) (types.Proxy, error) {
+			return nil, errors.New("failed")
+		},
+	)
+
+	pcm := newProxyClientManager(core)
+
+	session := &sessionutil.Session{
+		ServerID: 100,
+		Address:  "localhost",
+	}
+
+	pcm.AddProxyClient(session)
+}
+
+func TestProxyClientManager_InvalidateCollectionMetaCache(t *testing.T) {
+	Params.Init()
+	ctx := context.Background()
+
+	core, err := NewCore(ctx, nil)
+	assert.Nil(t, err)
+	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
+	assert.Nil(t, err)
+	core.etcdCli = cli
+
+	pcm := newProxyClientManager(core)
+
+	pcm.InvalidateCollectionMetaCache(ctx, nil)
+
+	core.SetNewProxyClient(
+		func(se *sessionutil.Session) (types.Proxy, error) {
+			return nil, nil
+		},
+	)
+
+	session := &sessionutil.Session{
+		ServerID: 100,
+		Address:  "localhost",
+	}
+
+	pcm.AddProxyClient(session)
+
+	pcm.InvalidateCollectionMetaCache(ctx, nil)
+}
+
+func TestProxyClientManager_ReleaseDQLMessageStream(t *testing.T) {
+	Params.Init()
+	ctx := context.Background()
+
+	core, err := NewCore(ctx, nil)
+	assert.Nil(t, err)
+	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
+	assert.Nil(t, err)
+	core.etcdCli = cli
+
+	pcm := newProxyClientManager(core)
+
+	pcm.ReleaseDQLMessageStream(ctx, nil)
+
+	core.SetNewProxyClient(
+		func(se *sessionutil.Session) (types.Proxy, error) {
+			return nil, nil
+		},
+	)
+
+	session := &sessionutil.Session{
+		ServerID: 100,
+		Address:  "localhost",
+	}
+
+	pcm.AddProxyClient(session)
+
+	assert.Panics(t, func() { pcm.ReleaseDQLMessageStream(ctx, nil) })
+}