tests: implemented multiple tileset tests

tests/test_data/tilesets/image/expected.py

@@ -0,0 +1,18 @@
+from pathlib import Path
+
+from pytiled_parser import tileset
+
+expected = tileset.TileSet(
+    columns=8,
+    image=Path(r"..\/..\/maps\/images\/tmw_desert_spacing.png"),
+    image_height=199,
+    image_width=265,
+    margin=1,
+    spacing=1,
+    name="tile_set_image",
+    tile_count=48,
+    tiled_version="1.3.1",
+    tile_height=32,
+    tile_width=32,
+    version=1.2,
+)