add unit test

Signed-off-by: Billy Zha <[email protected]>

registry/remote/credentials/internal/config/config.go

@@ -158,7 +158,7 @@ func Load(configPath string) (*Config, error) {
 // Path returns the path to the config file.
 func (cfg *Config) Path() (string, error) {
 	if cfg == nil {
-		errors.New("config file is nil")
+		return "", errors.New("config file is nil")
 	}
 	return cfg.path, nil
 }

registry/remote/credentials/internal/config/config_test.go

@@ -925,6 +925,28 @@ func TestConfig_GetCredentialHelper(t *testing.T) {
 	}
 }
 
+func TestConfig_Path(t *testing.T) {
+	cfg := Config{
+		path: "/path/to/config.json",
+	}
+	got, err := cfg.Path()
+
+	if err != nil {
+		t.Errorf("Config.GetPath() error = %v", err)
+	}
+	if got != cfg.path {
+		t.Errorf("Config.GetPath() = %v, want %v", got, cfg.path)
+	}
+}
+
+func TestConfig_Path_nil(t *testing.T) {
+	var cfg *Config
+	_, err := cfg.Path()
+	if err == nil {
+		t.Error("expecting error, got nil")
+	}
+}
+
 func TestConfig_CredentialsStore(t *testing.T) {
 	tests := []struct {
 		name       string

registry/remote/credentials/store_test.go

@@ -25,6 +25,7 @@ import (
 	"testing"
 
 	"oras.land/oras-go/v2/registry/remote/auth"
+	"oras.land/oras-go/v2/registry/remote/credentials/internal/config"
 	"oras.land/oras-go/v2/registry/remote/credentials/internal/config/configtest"
 )
 
@@ -611,6 +612,30 @@ func Test_DynamicStore_getHelperSuffix(t *testing.T) {
 		})
 	}
 }
+func Test_DynamicStore_GetConfigPath(t *testing.T) {
+	var store DynamicStore
+	var err error
+	path := "../../testdata/credsStore_config.json"
+	store.config, err = config.Load(path)
+	if err != nil {
+		t.Fatal("config.Load() error =", err)
+	}
+	got, err := store.GetConfigPath()
+	if err != nil {
+		t.Errorf("Config.GetPath() error = %v", err)
+	}
+	if got != path {
+		t.Errorf("Config.GetPath() = %v, want %v", got, path)
+	}
+}
+
+func Test_DynamicStore_Path_nil(t *testing.T) {
+	var store DynamicStore
+	_, err := store.GetConfigPath()
+	if err == nil {
+		t.Error("expecting error, got nil")
+	}
+}
 
 func Test_DynamicStore_getStore_nativeStore(t *testing.T) {
 	tests := []struct {