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: flow.service_test.go
    path of file: ./repos/erda/internal/apps/devflow/flow
    
    the code of the file until where you have to start completion: // Copyright (c) 2021 Terminus, Inc.
//
// 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 flow

import (
    
func TestService_isMROpenedOrNotCreated(t *testing.T) {
	var bdl *bundle.Bundle
	monkey.PatchInstanceMethod(reflect.TypeOf(bdl), "ListMergeRequest",
		func(bdl *bundle.Bundle, appID uint64, userID string, req apistructs.GittarQueryMrRequest) (*apistructs.QueryMergeRequestsData, error) {
			if appID == 0 {
				return nil, fmt.Errorf("fail")
			}
			if appID == 1 {
				return &apistructs.QueryMergeRequestsData{
					List:  nil,
					Total: 0,
				}, nil
			}
			if appID == 2 {
				return &apistructs.QueryMergeRequestsData{
					List: []*apistructs.MergeRequestInfo{
						{
							Id:    1,
							State: "closed",
						},
					},
					Total: 1,
				}, nil
			}
			return &apistructs.QueryMergeRequestsData{
				List: []*apistructs.MergeRequestInfo{
					{
						Id:    2,
						State: "open",
					},
					{
						Id:    3,
						State: "merged",
					},
				},
				Total: 2,
			}, nil
		})
	defer monkey.UnpatchAll()

	type fields struct {
		p *provider
	}
	type args struct {
		ctx           context.Context
		currentBranch string
		targetBranch  string
		appID         uint64
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		want    bool
		wantErr bool
	}{
		{
			name: "test with err",
			fields: fields{
				p: &provider{bdl: bdl},
			},
			args: args{
				ctx:           context.Background(),
				currentBranch: "feature/dop",
				targetBranch:  "master",
				appID:         0,
			},
			want:    false,
			wantErr: true,
		},
		{
			name: "test with not created",
			fields: fields{
				p: &provider{bdl: bdl},
			},
			args: args{
				ctx:           context.Background(),
				currentBranch: "feature/dop",
				targetBranch:  "master",
				appID:         1,
			},
			want:    true,
			wantErr: false,
		},
		{
			name: "test with not have open",
			fields: fields{
				p: &provider{bdl: bdl},
			},
			args: args{
				ctx:           context.Background(),
				currentBranch: "feature/dop",
				targetBranch:  "master",
				appID:         2,
			},
			want:    false,
			wantErr: false,
		},
		{
			name: "test with have open",
			fields: fields{
				p: &provider{bdl: bdl},
			},
			args: args{
				ctx:           context.Background(),
				currentBranch: "feature/dop",
				targetBranch:  "master",
				appID:         3,
			},
			want:    true,
			wantErr: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			s := &Service{
				p: tt.fields.p,
			}
			got, err := s.IsMROpenedOrNotCreated(tt.args.ctx, tt.args.currentBranch, tt.args.targetBranch, tt.args.appID)
			if (err != nil) != tt.wantErr {
				t.Errorf("isMROpenedOrNotCreated() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if got != tt.want {
				t.Errorf("isMROpenedOrNotCreated() got = %v, want %v", got, tt.want)
			}
		})
	}
}