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: application_test.go
    path of file: ./repos/gotosocial/internal/db/bundb
    
    the code of the file until where you have to start completion: // GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package bundb_test

import (
	"context"
	"errors"
	"reflect"
	"testing"
	"time"

	"github.com/stretchr/testify/suite"
	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)

type ApplicationTestSuite struct {
	BunDBStandardTestSuite
}

func (suite *ApplicationTestSuite) TestGetApplicationBy() {
	t := suite.T()

	// Create a new context for this test.
	ctx, cncl := context.WithCancel(context
    
func (suite *ApplicationTestSuite) TestGetApplicationBy() {
	t := suite.T()

	// Create a new context for this test.
	ctx, cncl := context.WithCancel(context.Background())
	defer cncl()

	// Sentinel error to mark avoiding a test case.
	sentinelErr := errors.New("sentinel")

	// isEqual checks if 2 application models are equal.
	isEqual := func(a1, a2 gtsmodel.Application) bool {
		// Clear database-set fields.
		a1.CreatedAt = time.Time{}
		a2.CreatedAt = time.Time{}
		a1.UpdatedAt = time.Time{}
		a2.UpdatedAt = time.Time{}

		return reflect.DeepEqual(a1, a2)
	}

	for _, app := range suite.testApplications {
		for lookup, dbfunc := range map[string]func() (*gtsmodel.Application, error){
			"id": func() (*gtsmodel.Application, error) {
				return suite.db.GetApplicationByID(ctx, app.ID)
			},

			"client_id": func() (*gtsmodel.Application, error) {
				return suite.db.GetApplicationByClientID(ctx, app.ClientID)
			},
		} {
			// Clear database caches.
			suite.state.Caches.Init()

			t.Logf("checking database lookup %q", lookup)

			// Perform database function.
			checkApp, err := dbfunc()
			if err != nil {
				if err == sentinelErr {
					continue
				}

				t.Errorf("error encountered for database lookup %q: %v", lookup, err)
				continue
			}

			// Check received application data.
			if !isEqual(*checkApp, *app) {
				t.Errorf("application does not contain expected data: %+v", checkApp)
				continue
			}
		}
	}
}