paginate artist album fetching for deezer and qobuz

internal/provider/qobuz/client_test.go

@@ -157,6 +157,53 @@ func TestGetLabelPagination(t *testing.T) {
 	}
 }
 
+func TestGetArtistPagination(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		offset := r.URL.Query().Get("offset")
+		if offset == "" {
+			offset = "0"
+		}
+
+		resp := map[string]any{}
+		switch offset {
+		case "0":
+			resp = map[string]any{
+				"albums_count": 620,
+				"albums":       map[string]any{"items": makeItems(0, 500)},
+			}
+		case "500":
+			resp = map[string]any{"albums": map[string]any{"items": makeItems(500, 620)}}
+		default:
+			w.WriteHeader(http.StatusNotFound)
+			_ = json.NewEncoder(w).Encode(map[string]any{"message": "not found"})
+			return
+		}
+
+		_ = json.NewEncoder(w).Encode(resp)
+	}))
+	defer ts.Close()
+
+	c := newTestClient(t)
+	c.loggedIn = true
+	c.baseURL = ts.URL
+
+	raw, err := c.GetMetadata(context.Background(), "artist-id", "artist")
+	if err != nil {
+		t.Fatalf("GetMetadata() error = %v", err)
+	}
+	albums, ok := mapValue(raw["albums"])
+	if !ok {
+		t.Fatalf("albums missing")
+	}
+	items, ok := albums["items"].([]any)
+	if !ok {
+		t.Fatalf("items missing")
+	}
+	if len(items) != 620 {
+		t.Fatalf("len(items) = %d, want 620", len(items))
+	}
+}
+
 func newTestClient(t *testing.T) *Client {
 	t.Helper()
 	d := config.DefaultConfigData()