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: hostscontainer_internal_test.go
    path of file: ./repos/AdGuardHome/internal/aghnet
    
    the code of the file until where you have to start completion: package aghnet

import (
	"io/fs"
	"path"
	"testing"
	"testing/fstest"

	"github.com/AdguardTeam/golibs/errors"
	"github.com/AdguardTeam/golibs/testutil/fakefs"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const nl = "\n"

func TestHostsContainer_PathsToPatterns(t *testing.T) {
	gsfs := fstest.MapFS{
		"dir_0/file_1":       &fstest.MapFile{Data: []byte{1}},
		"dir_0/file_2":       &fstest.MapFile{Data: []byte{2}},
		"dir_0/dir_1/file_3": &fstest.MapFile{Data: []byte{3}},
	}

	testCases := []struct {
		name  string
		paths []string
		want  []string
	}{{
		name:  "no_paths",
		paths: nil,
		want:  nil,
	}, {
		name:  "single_file",
		paths: []string{"dir_0/file_1"},
		want:  []string{"dir_0/file_1"},
	}, {
		name:  "several_files",
		paths: []string{"dir_0/file_1", "dir_0/file_2"},
		want:  []string{"dir_0/file_1", "dir_0/file_2"},
	}, {
		name:  "whole_dir",
		paths: []string{"dir_0"},
		w
    
func TestHostsContainer_PathsToPatterns(t *testing.T) {
	gsfs := fstest.MapFS{
		"dir_0/file_1":       &fstest.MapFile{Data: []byte{1}},
		"dir_0/file_2":       &fstest.MapFile{Data: []byte{2}},
		"dir_0/dir_1/file_3": &fstest.MapFile{Data: []byte{3}},
	}

	testCases := []struct {
		name  string
		paths []string
		want  []string
	}{{
		name:  "no_paths",
		paths: nil,
		want:  nil,
	}, {
		name:  "single_file",
		paths: []string{"dir_0/file_1"},
		want:  []string{"dir_0/file_1"},
	}, {
		name:  "several_files",
		paths: []string{"dir_0/file_1", "dir_0/file_2"},
		want:  []string{"dir_0/file_1", "dir_0/file_2"},
	}, {
		name:  "whole_dir",
		paths: []string{"dir_0"},
		want:  []string{"dir_0/*"},
	}, {
		name:  "file_and_dir",
		paths: []string{"dir_0/file_1", "dir_0/dir_1"},
		want:  []string{"dir_0/file_1", "dir_0/dir_1/*"},
	}, {
		name:  "non-existing",
		paths: []string{path.Join("dir_0", "file_3")},
		want:  nil,
	}}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			patterns, err := pathsToPatterns(gsfs, tc.paths)
			require.NoError(t, err)

			assert.Equal(t, tc.want, patterns)
		})
	}

	t.Run("bad_file", func(t *testing.T) {
		const errStat errors.Error = "bad file"

		badFS := &fakefs.StatFS{
			OnOpen: func(_ string) (f fs.File, err error) { panic("not implemented") },
			OnStat: func(name string) (fi fs.FileInfo, err error) {
				return nil, errStat
			},
		}

		_, err := pathsToPatterns(badFS, []string{""})
		assert.ErrorIs(t, err, errStat)
	})
}