feat(lidarrconfig): typed singleton config wrapper

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/lidarrconfig/service_test.go

@@ -0,0 +1,88 @@
+package lidarrconfig
+
+import (
+	"context"
+	"io"
+	"log/slog"
+	"os"
+	"testing"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.fabledsword.com/bvandeusen/minstrel/internal/db"
+)
+
+func newTestPool(t *testing.T) *pgxpool.Pool {
+	t.Helper()
+	if testing.Short() {
+		t.Skip("skipping integration test in -short mode")
+	}
+	dsn := os.Getenv("MINSTREL_TEST_DATABASE_URL")
+	if dsn == "" {
+		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
+	}
+	if err := db.Migrate(dsn, slog.New(slog.NewTextHandler(io.Discard, nil))); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	pool, err := pgxpool.New(context.Background(), dsn)
+	if err != nil {
+		t.Fatalf("pool: %v", err)
+	}
+	t.Cleanup(pool.Close)
+	// Reset singleton to default state before each test by replacing
+	// the row contents via UPDATE (TRUNCATE would violate the CHECK).
+	if _, err := pool.Exec(context.Background(),
+		"UPDATE lidarr_config SET enabled=false, base_url=NULL, api_key=NULL, default_quality_profile_id=NULL, default_root_folder_path=NULL WHERE id=1",
+	); err != nil {
+		t.Fatalf("reset: %v", err)
+	}
+	return pool
+}
+
+func TestGet_DefaultRowReturnsZeroValueConfig(t *testing.T) {
+	pool := newTestPool(t)
+	cfg, err := New(pool).Get(context.Background())
+	if err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+	if cfg.Enabled || cfg.BaseURL != "" || cfg.APIKey != "" {
+		t.Errorf("expected zero-value Config, got %+v", cfg)
+	}
+}
+
+func TestSaveThenGet_RoundTrip(t *testing.T) {
+	pool := newTestPool(t)
+	s := New(pool)
+	want := Config{
+		Enabled:                 true,
+		BaseURL:                 "http://lidarr.lan:8686",
+		APIKey:                  "secret",
+		DefaultQualityProfileID: 4,
+		DefaultRootFolderPath:   "/music",
+	}
+	if err := s.Save(context.Background(), want); err != nil {
+		t.Fatalf("Save: %v", err)
+	}
+	got, err := s.Get(context.Background())
+	if err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+	if got != want {
+		t.Errorf("round-trip mismatch:\n got = %+v\nwant = %+v", got, want)
+	}
+}
+
+func TestSave_EmptyValuesPersistAsNULL(t *testing.T) {
+	pool := newTestPool(t)
+	s := New(pool)
+	if err := s.Save(context.Background(), Config{Enabled: false}); err != nil {
+		t.Fatalf("Save: %v", err)
+	}
+	got, err := s.Get(context.Background())
+	if err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+	if got.BaseURL != "" || got.APIKey != "" || got.DefaultRootFolderPath != "" {
+		t.Errorf("expected empty strings on round-trip; got %+v", got)
+	}
+}