build spotify-to-navidrome migrator with recovery flow

internal/session/session_test.go

@@ -0,0 +1,42 @@
+package session
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestSaveLoadRoundTrip(t *testing.T) {
+	t.Parallel()
+
+	path := filepath.Join(t.TempDir(), "session.json")
+	in := Data{
+		Spotify: SpotifyState{
+			ClientID:     "abc123",
+			AccessToken:  "access-token",
+			RefreshToken: "refresh-token",
+			ExpiresAt:    "2026-01-02T03:04:05Z",
+		},
+	}
+
+	if err := Save(path, in); err != nil {
+		t.Fatalf("Save failed: %v", err)
+	}
+
+	out, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load failed: %v", err)
+	}
+
+	if out.Spotify.ClientID != in.Spotify.ClientID {
+		t.Fatalf("ClientID mismatch: got %q want %q", out.Spotify.ClientID, in.Spotify.ClientID)
+	}
+	if out.Spotify.AccessToken != in.Spotify.AccessToken {
+		t.Fatalf("AccessToken mismatch")
+	}
+	if out.Spotify.RefreshToken != in.Spotify.RefreshToken {
+		t.Fatalf("RefreshToken mismatch")
+	}
+	if out.Spotify.ExpiresAt != in.Spotify.ExpiresAt {
+		t.Fatalf("ExpiresAt mismatch: got %q want %q", out.Spotify.ExpiresAt, in.Spotify.ExpiresAt)
+	}
+}