chore: refresh gramsrv public release

internal/app/files/maptile_test.go

@@ -0,0 +1,48 @@
+package files
+
+import (
+	"bytes"
+	"image/png"
+	"testing"
+)
+
+func TestGeoMapTileDeterministicPNG(t *testing.T) {
+	var s *Service
+	first, mime := s.GeoMapTile(39.9042, 116.4074, 256, 128, 15, 2)
+	second, _ := s.GeoMapTile(39.9042, 116.4074, 256, 128, 15, 2)
+	if mime != "image/png" {
+		t.Fatalf("mime = %q, want image/png", mime)
+	}
+	if !bytes.Equal(first, second) {
+		t.Fatal("map tile must be byte-identical for identical input (chunked download consistency)")
+	}
+	img, err := png.Decode(bytes.NewReader(first))
+	if err != nil {
+		t.Fatalf("decode png: %v", err)
+	}
+	if img.Bounds().Dx() != 512 || img.Bounds().Dy() != 256 {
+		t.Fatalf("tile dims = %dx%d, want 512x256 (w*scale x h*scale)", img.Bounds().Dx(), img.Bounds().Dy())
+	}
+}
+
+func TestGeoMapTileClampsBounds(t *testing.T) {
+	var s *Service
+	tile, _ := s.GeoMapTile(0, 0, 99999, -5, 99, 9)
+	img, err := png.Decode(bytes.NewReader(tile))
+	if err != nil {
+		t.Fatalf("decode png: %v", err)
+	}
+	// w clamp 1024、h clamp 16、scale clamp 3。
+	if img.Bounds().Dx() != 1024*3 || img.Bounds().Dy() != 16*3 {
+		t.Fatalf("tile dims = %dx%d, want 3072x48", img.Bounds().Dx(), img.Bounds().Dy())
+	}
+}
+
+func TestGeoMapTileDiffersByLocation(t *testing.T) {
+	var s *Service
+	a, _ := s.GeoMapTile(39.9042, 116.4074, 128, 128, 15, 1)
+	b, _ := s.GeoMapTile(31.2304, 121.4737, 128, 128, 15, 1)
+	if bytes.Equal(a, b) {
+		t.Fatal("different locations should render different tiles")
+	}
+}