step 1: lock public api and pure core

tests/test_cache.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from dpg_map.cache import CacheStats, DiskCacheConfig, MemoryCacheConfig
+
+
+def test_cache_stats_dataclass_construction() -> None:
+    stats = CacheStats(
+        memory_tiles=3,
+        memory_max_tiles=512,
+        memory_hits=10,
+        memory_misses=2,
+        disk_bytes=1024,
+        disk_max_bytes=None,
+        disk_hits=7,
+        disk_misses=1,
+        disk_path=Path("/tmp/dpg-map-cache"),
+    )
+
+    assert stats.memory_tiles == 3
+    assert stats.disk_max_bytes is None
+    assert stats.disk_path == Path("/tmp/dpg-map-cache")
+
+
+def test_initial_cache_config_dataclasses() -> None:
+    memory_config = MemoryCacheConfig()
+    disk_config = DiskCacheConfig()
+
+    assert memory_config.max_tiles == 512
+    assert disk_config.max_bytes == 2_000_000_000