Add tests for cache hits and misses with None and default values

tests/panels/test_cache.py

@@ -45,6 +45,37 @@ def test_hits_and_misses(self):
         self.assertEqual(self.panel.hits, 4)
         self.assertEqual(self.panel.misses, 2)
 
+    def test_cached_none_counts_as_hit(self):
+        cache.cache.clear()
+
+        cache.cache.set("foo", None)
+        self.assertIsNone(cache.cache.get("foo"))
+        self.assertEqual(self.panel.hits, 1)
+        self.assertEqual(self.panel.misses, 0)
+
+    def test_missing_key_with_default_counts_as_miss(self):
+        cache.cache.clear()
+
+        self.assertIsNone(cache.cache.get("foo", None))
+        self.assertEqual(self.panel.hits, 0)
+        self.assertEqual(self.panel.misses, 1)
+
+    def test_missing_key_returns_supplied_default(self):
+        cache.cache.clear()
+
+        self.assertEqual(cache.cache.get("foo", "bar"), "bar")
+        self.assertEqual(self.panel.hits, 0)
+        self.assertEqual(self.panel.misses, 1)
+
+    def test_cached_value_equal_to_default_counts_as_hit(self):
+        cache.cache.clear()
+
+        cache.cache.set("foo", "bar")
+        self.assertEqual(cache.cache.get("foo", "bar"), "bar")
+
+        self.assertEqual(self.panel.hits, 1)
+        self.assertEqual(self.panel.misses, 0)
+
     def test_get_or_set_value(self):
         cache.cache.get_or_set("baz", "val")
         self.assertEqual(cache.cache.get("baz"), "val")