test: prevent environment variables from overriding config file values in tests

Added a loadEnvVars parameter to InitConfig to control whether environment
variables should be loaded via viper.AutomaticEnv(). In tests, environment
variables (like ND_MUSICFOLDER) were overriding values from config test files,
causing tests to fail when these variables were set in the developer's
environment. Now tests can pass loadEnvVars=false to isolate from the
environment while production code continues to use loadEnvVars=true.

Signed-off-by: Deluan <deluan@navidrome.org>

cmd/root.go

@@ -346,7 +346,7 @@ func startPluginManager(ctx context.Context) func() error {
 // TODO: Implement some struct tags to map flags to viper
 func init() {
 	cobra.OnInitialize(func() {
-		conf.InitConfig(cfgFile)
+		conf.InitConfig(cfgFile, true)
 	})
 
 	rootCmd.PersistentFlags().StringVarP(&cfgFile, "configfile", "c", "", `config file (default "./navidrome.toml")`)

conf/configuration.go

@@ -617,7 +617,7 @@ func init() {
 	setViperDefaults()
 }
 
-func InitConfig(cfgFile string) {
+func InitConfig(cfgFile string, loadEnvVars bool) {
 	codecRegistry := viper.NewCodecRegistry()
 	_ = codecRegistry.RegisterCodec("ini", ini.Codec{
 		LoadOptions: ini.LoadOptions{
@@ -638,10 +638,12 @@ func InitConfig(cfgFile string) {
 	}
 
 	_ = viper.BindEnv("port")
+	if loadEnvVars {
 		viper.SetEnvPrefix("ND")
 		replacer := strings.NewReplacer(".", "_")
 		viper.SetEnvKeyReplacer(replacer)
 		viper.AutomaticEnv()
+	}
 
 	err := viper.ReadInConfig()
 	if viper.ConfigFileUsed() != "" && err != nil {

conf/configuration_test.go

@@ -31,7 +31,7 @@ var _ = Describe("Configuration", func() {
 			filename := filepath.Join("testdata", "cfg."+format)
 
 			// Initialize config with the test file
-			conf.InitConfig(filename)
+			conf.InitConfig(filename, false)
 			// Load the configuration (with noConfigDump=true)
 			conf.Load(true)