test: use t.Setenv to set env vars in tests (bluenviron#2722)

This commit replaces `os.Setenv` with `t.Setenv` in tests. The
environment variable is automatically restored to its original value
when the test and all its subtests complete.

Reference: https://pkg.go.dev/testing#T.Setenv

Signed-off-by: Eng Zer Jun <[email protected]>

internal/conf/conf_test.go

@@ -113,20 +113,16 @@ func TestConfFromFile(t *testing.T) {
 
 func TestConfFromFileAndEnv(t *testing.T) {
 	// global parameter
-	os.Setenv("RTSP_PROTOCOLS", "tcp")
-	defer os.Unsetenv("RTSP_PROTOCOLS")
+	t.Setenv("RTSP_PROTOCOLS", "tcp")
 
 	// path parameter
-	os.Setenv("MTX_PATHS_CAM1_SOURCE", "rtsp://testing")
-	defer os.Unsetenv("MTX_PATHS_CAM1_SOURCE")
+	t.Setenv("MTX_PATHS_CAM1_SOURCE", "rtsp://testing")
 
 	// deprecated global parameter
-	os.Setenv("MTX_RTMPDISABLE", "yes")
-	defer os.Unsetenv("MTX_RTMPDISABLE")
+	t.Setenv("MTX_RTMPDISABLE", "yes")
 
 	// deprecated path parameter
-	os.Setenv("MTX_PATHS_CAM2_DISABLEPUBLISHEROVERRIDE", "yes")
-	defer os.Unsetenv("MTX_PATHS_CAM2_DISABLEPUBLISHEROVERRIDE")
+	t.Setenv("MTX_PATHS_CAM2_DISABLEPUBLISHEROVERRIDE", "yes")
 
 	tmpf, err := writeTempFile([]byte("{}"))
 	require.NoError(t, err)
@@ -149,8 +145,7 @@ func TestConfFromFileAndEnv(t *testing.T) {
 }
 
 func TestConfFromEnvOnly(t *testing.T) {
-	os.Setenv("MTX_PATHS_CAM1_SOURCE", "rtsp://testing")
-	defer os.Unsetenv("MTX_PATHS_CAM1_SOURCE")
+	t.Setenv("MTX_PATHS_CAM1_SOURCE", "rtsp://testing")
 
 	conf, confPath, err := Load("", nil)
 	require.NoError(t, err)
@@ -179,8 +174,7 @@ func TestConfEncryption(t *testing.T) {
 		return base64.StdEncoding.EncodeToString(encrypted)
 	}()
 
-	os.Setenv("RTSP_CONFKEY", key)
-	defer os.Unsetenv("RTSP_CONFKEY")
+	t.Setenv("RTSP_CONFKEY", key)
 
 	tmpf, err := writeTempFile([]byte(encryptedConf))
 	require.NoError(t, err)

internal/conf/env/env_test.go

@@ -2,7 +2,6 @@ package env
 
 import (
 	"encoding/json"
-	"os"
 	"testing"
 	"time"
 
@@ -127,8 +126,7 @@ func TestLoad(t *testing.T) {
 	}
 
 	for key, val := range env {
-		os.Setenv(key, val)
-		defer os.Unsetenv(key)
+		t.Setenv(key, val)
 	}
 
 	var s testStruct