You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: default_bulkpub_test.go
    path of file: ./repos/dapr/pkg/runtime/pubsub
    
    the code of the file until where you have to start completion: /*
Copyright 2022 The Dapr Authors
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 pubsub

import (
	"context"
	"errors"
	"fmt"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/require"

	contribPubsub "github.com/dapr/components-contrib/pubsub"
	daprt "github.com/dapr/dapr/pkg/testing"
)

func TestBulkPublish_DefaultBulkPublisher(t *testing.T) {
	req := &contribPubsub.BulkPublishRequest{
		Entries: []contribPubsub.BulkMessageEntry{
			{
				EntryId:     "78a48b5c-ff5a-4275-9bef-4a3bb8eefc3b",
				Event:       []byte("event1"),
				ContentType: "text/plain",
				Metadata:    map[string]string{},
			},
			{
				EntryId:     "d64669e2-fab6-4452-a933-8de44e26ca02",
				Event:       []byte("event2"),
				ContentType: "text/plain",
				Metadata:    map[string]string{},
		
    
func TestBulkPublish_DefaultBulkPublisher(t *testing.T) {
	req := &contribPubsub.BulkPublishRequest{
		Entries: []contribPubsub.BulkMessageEntry{
			{
				EntryId:     "78a48b5c-ff5a-4275-9bef-4a3bb8eefc3b",
				Event:       []byte("event1"),
				ContentType: "text/plain",
				Metadata:    map[string]string{},
			},
			{
				EntryId:     "d64669e2-fab6-4452-a933-8de44e26ca02",
				Event:       []byte("event2"),
				ContentType: "text/plain",
				Metadata:    map[string]string{},
			},
			{
				EntryId:     "b3b4b2e1-2b9b-4b9b-9b9b-9b9b9b9b9b9b",
				Event:       []byte("event3"),
				ContentType: "text/plain",
				Metadata:    map[string]string{},
			},
		},
		PubsubName: "pubsub",
		Topic:      "topic",
		Metadata:   map[string]string{},
	}

	tcs := []struct {
		name          string
		publishErrors []error
		nErrors       int
	}{
		{
			name:          "default bulk publish without publish errors",
			publishErrors: []error{nil, nil, nil},
			nErrors:       0,
		},
		{
			name:          "default bulk publish with all publish errors",
			publishErrors: []error{errors.New("publish error"), errors.New("publish error"), errors.New("publish error")},
			nErrors:       3,
		},
		{
			name:          "default bulk publish with partial publish errors",
			publishErrors: []error{nil, nil, errors.New("publish error")},
			nErrors:       1,
		},
	}

	for _, tc := range tcs {
		t.Run(fmt.Sprintf(tc.name), func(t *testing.T) {
			// Create publish requests for each message in the bulk request.
			var pubReqs []*contribPubsub.PublishRequest
			for _, entry := range req.Entries {
				contentType := entry.ContentType
				pubReqs = append(pubReqs, &contribPubsub.PublishRequest{
					Data:        entry.Event,
					ContentType: &contentType,
					Metadata:    entry.Metadata,
					PubsubName:  req.PubsubName,
					Topic:       req.Topic,
				})
			}

			// Set up the mock pubsub to return the publish errors.
			mockPubSub := &daprt.MockPubSub{Mock: mock.Mock{}}
			for i, e := range tc.publishErrors {
				mockPubSub.Mock.On("Publish", pubReqs[i]).Return(e)
			}
			bulkPublisher := NewDefaultBulkPublisher(mockPubSub)

			res, err := bulkPublisher.BulkPublish(context.Background(), req)

			// Check if the bulk publish method returns an error.
			if tc.nErrors > 0 {
				require.Error(t, err)
				// Response should contain an entry for each message in the bulk request.
				assert.Len(t, res.FailedEntries, tc.nErrors)
			} else {
				require.NoError(t, err)
				assert.Empty(t, res.FailedEntries)
			}

			var pubInvocationArgs []*contribPubsub.PublishRequest

			// Assert that all Publish requests have the correct topic and pubsub name.
			for _, call := range mockPubSub.Calls {
				assert.Equal(t, "Publish", call.Method)

				pubReq, ok := call.Arguments.Get(0).(*contribPubsub.PublishRequest)
				assert.True(t, ok)

				assert.Equal(t, req.PubsubName, pubReq.PubsubName)
				assert.Equal(t, req.Topic, pubReq.Topic)

				pubInvocationArgs = append(pubInvocationArgs, pubReq)
			}

			// Assert that a Publish request should be there for the message that was in the bulk publish request.
			for _, pubReq := range pubReqs {
				assert.Contains(t, pubInvocationArgs, pubReq)
			}
		})
	}
}