1 files changed, 61 insertions, 0 deletions
diff --git a/test/util/geo.cpp b/test/util/geo.cpp
new file mode 100644
index 0000000000..88f8bc496b
--- /dev/null
+++ b/test/util/geo.cpp
@@ -0,0 +1,61 @@
+#include "../fixtures/util.hpp"
+
+#include <mbgl/util/geo.hpp>
+#include <mbgl/map/tile_id.hpp>
+
+using namespace mbgl;
+
+TEST(Geo, LatLngFromTileID) {
+    for (int i = 0; i < 20; i++) {
+        const LatLng ll{ TileID(i, 0, 0, 0) };
+        ASSERT_DOUBLE_EQ(-180, ll.longitude);
+        ASSERT_DOUBLE_EQ(85.051128779806604, ll.latitude);
+    }
+
+    {
+        const LatLng ll{ TileID(0, 1, 0, 0) };
+        ASSERT_DOUBLE_EQ(180, ll.longitude);
+        ASSERT_DOUBLE_EQ(85.051128779806604, ll.latitude);
+    }
+
+    {
+        const LatLng ll{ TileID(0, -1, 0, 0) };
+        ASSERT_DOUBLE_EQ(-540, ll.longitude);
+        ASSERT_DOUBLE_EQ(85.051128779806604, ll.latitude);
+    }
+}
+
+
+TEST(Geo, LatLngBoundsFromTileID) {
+    {
+        const LatLngBounds bounds{ TileID(0, 0, 0, 0) };
+        ASSERT_DOUBLE_EQ(-180, bounds.sw.longitude);
+        ASSERT_DOUBLE_EQ(-85.051128779806604, bounds.sw.latitude);
+        ASSERT_DOUBLE_EQ(180, bounds.ne.longitude);
+        ASSERT_DOUBLE_EQ(85.051128779806604, bounds.ne.latitude);
+    }
+
+    {
+        const LatLngBounds bounds{ TileID(1, 0, 1, 0) };
+        ASSERT_DOUBLE_EQ(-180, bounds.sw.longitude);
+        ASSERT_DOUBLE_EQ(-85.051128779806604, bounds.sw.latitude);
+        ASSERT_DOUBLE_EQ(0, bounds.ne.longitude);
+        ASSERT_DOUBLE_EQ(0, bounds.ne.latitude);
+    }
+
+    {
+        const LatLngBounds bounds{ TileID(1, 1, 1, 0) };
+        ASSERT_DOUBLE_EQ(0, bounds.sw.longitude);
+        ASSERT_DOUBLE_EQ(-85.051128779806604, bounds.sw.latitude);
+        ASSERT_DOUBLE_EQ(180, bounds.ne.longitude);
+        ASSERT_DOUBLE_EQ(0, bounds.ne.latitude);
+    }
+
+    {
+        const LatLngBounds bounds{ TileID(1, 0, 0, 0) };
+        ASSERT_DOUBLE_EQ(-180, bounds.sw.longitude);
+        ASSERT_DOUBLE_EQ(0, bounds.sw.latitude);
+        ASSERT_DOUBLE_EQ(0, bounds.ne.longitude);
+        ASSERT_DOUBLE_EQ(85.051128779806604, bounds.ne.latitude);
+    }
+}