fix: test_server_level due to upstream api change

src/endstone_test/tests/test_server.py

@@ -12,13 +12,10 @@ def test_server_version(server: Server) -> None:
     assert server.minecraft_version == f"v{__minecraft_version__}"
 
 
-def test_server_levels(server: Server) -> None:
-    assert len(server.levels) == 1
-    for level in server.levels:
-        assert server.get_level(level.name) is level
-
-        for dimension in level.dimensions:
-            assert level.get_dimension(dimension.name) is dimension
+def test_server_level(server: Server) -> None:
+    level = server.level
+    for dimension in level.dimensions:
+        assert level.get_dimension(dimension.name) is dimension
 
 
 def test_dispatch_command(server: Server) -> None: