fix(auth): create cache directory if needed

spotify/auth.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"path/filepath"
 
 	"github.com/arunsworld/nursery"
 	"github.com/streambinder/spotitube/util"
@@ -142,6 +143,10 @@ func Recover(authenticator *spotifyauth.Authenticator, state string) (*Client, e
 }
 
 func (client *Client) Persist() error {
+	if err := os.MkdirAll(filepath.Dir(tokenPath), 0o755); err != nil {
+		return err
+	}
+
 	token, err := client.Token()
 	if err != nil {
 		return err

spotify/auth_test.go

@@ -246,6 +246,24 @@ func TestAuthenticateRecoverAndPersistTokenFailure(t *testing.T) {
 	assert.EqualError(t, util.ErrOnly(Authenticate(nil)), "ko")
 }
 
+func TestAuthenticateRecoverAndPersistMkdirFailure(t *testing.T) {
+	t.Cleanup(resetPort)
+	port = getPort()
+
+	// monkey patching
+	defer gomonkey.NewPatches().
+		ApplyMethod(&spotify.Client{}, "Token", func() (*oauth2.Token, error) {
+			return nil, nil
+		}).
+		ApplyFunc(os.MkdirAll, func() error {
+			return errors.New("ko")
+		}).
+		Reset()
+
+	// testing
+	assert.EqualError(t, util.ErrOnly(Authenticate(nil)), "ko")
+}
+
 func TestAuthenticateRecoverAndPersistOpenFailure(t *testing.T) {
 	t.Cleanup(resetPort)
 	port = getPort()