[chore][exporter/file] Do not leak temp files during tests (open-tele…

…metry#29554)

Tests are leaking temporary files since they were not created under the
`t.TempDir()`. This change moves all temporary files to `t.TemDir()` and
add the needed `Shutdown` and `Close` calls to ensure that the files are
closed before the test clean-up.

**Testing:**
Local Windows and Linux `make` of `exporter\fileexporter`

exporter/fileexporter/factory_test.go

@@ -43,6 +43,7 @@ func TestCreateMetricsExporter(t *testing.T) {
  cfg)
  assert.NoError(t, err)
  require.NotNil(t, exp)
+ assert.NoError(t, exp.Shutdown(context.Background()))
 }
 
 func TestCreateTracesExporter(t *testing.T) {
@@ -56,6 +57,7 @@ func TestCreateTracesExporter(t *testing.T) {
  cfg)
  assert.NoError(t, err)
  require.NotNil(t, exp)
+ assert.NoError(t, exp.Shutdown(context.Background()))
 }
 
 func TestCreateTracesExporterError(t *testing.T) {
@@ -80,6 +82,7 @@ func TestCreateLogsExporter(t *testing.T) {
  cfg)
  assert.NoError(t, err)
  require.NotNil(t, exp)
+ assert.NoError(t, exp.Shutdown(context.Background()))
 }
 
 func TestCreateLogsExporterError(t *testing.T) {
@@ -157,6 +160,9 @@ func TestBuildFileWriter(t *testing.T) {
  for _, tt := range tests {
  t.Run(tt.name, func(t *testing.T) {
  got, err := buildFileWriter(tt.args.cfg)
+ defer func() {
+ assert.NoError(t, got.Close())
+ }()
  assert.NoError(t, err)
  tt.validate(t, got)
  })

exporter/fileexporter/file_exporter_test.go

@@ -10,6 +10,7 @@ import (
  "errors"
  "io"
  "os"
+ "path/filepath"
  "sync"
  "testing"
  "time"
@@ -484,12 +485,7 @@ func TestExportMessageAsBuffer(t *testing.T) {
 
 // tempFileName provides a temporary file name for testing.
 func tempFileName(t *testing.T) string {
- tmpfile, err := os.CreateTemp("", "*")
- require.NoError(t, err)
- require.NoError(t, tmpfile.Close())
- socket := tmpfile.Name()
- require.NoError(t, os.Remove(socket))
- return socket
+ return filepath.Join(t.TempDir(), "fileexporter_test.tmp")
 }
 
 // errorWriter is an io.Writer that will return an error all ways