moar tests

src/textual/_cache.py

@@ -14,7 +14,7 @@ where the overhead of the cache is a small fraction of the total processing time
 
 from __future__ import annotations
 
-from typing import cast, Dict, Generic, KeysView, TypeVar, overload
+from typing import Dict, Generic, KeysView, TypeVar, overload
 
 CacheKey = TypeVar("CacheKey")
 CacheValue = TypeVar("CacheValue")
@@ -71,7 +71,7 @@ class LRUCache(Generic[CacheKey, CacheValue]):
 
     def __repr__(self) -> str:
         return (
-            f"<LRUCache maxsize={self._maxsize} hits={self.hits} misses={self.misses}"
+            f"<LRUCache maxsize={self._maxsize} hits={self.hits} misses={self.misses}>"
         )
 
     def grow(self, maxsize: int) -> None:

tests/test_cache.py

@@ -9,6 +9,8 @@ from textual._cache import FIFOCache, LRUCache
 def test_lru_cache():
     cache = LRUCache(3)
 
+    assert str(cache) == "<LRUCache maxsize=3 hits=0 misses=0>"
+
     # insert some values
     cache["foo"] = 1
     cache["bar"] = 2
@@ -35,6 +37,38 @@ def test_lru_cache():
     assert "eggegg" in cache
 
 
+def test_lru_cache_hits():
+    cache = LRUCache(4)
+    assert cache.hits == 0
+    assert cache.misses == 0
+
+    try:
+        cache["foo"]
+    except KeyError:
+        assert cache.hits == 0
+        assert cache.misses == 1
+
+    cache["foo"] = 1
+    assert cache.hits == 0
+    assert cache.misses == 1
+
+    cache["foo"]
+    cache["foo"]
+
+    assert cache.hits == 2
+    assert cache.misses == 1
+
+    cache.get("bar")
+    assert cache.hits == 2
+    assert cache.misses == 2
+
+    cache.get("foo")
+    assert cache.hits == 3
+    assert cache.misses == 2
+
+    assert str(cache) == "<LRUCache maxsize=4 hits=3 misses=2>"
+
+
 def test_lru_cache_get():
     cache = LRUCache(3)