test(caching_unit_tests.py): add unit tests for llm caching

ensures coverage for common caching scenarios across different implementations

tests/local_testing/test_disk_cache_unit_tests.py

@@ -0,0 +1,11 @@
+from cache_unit_tests import LLMCachingUnitTests
+from litellm.caching import LiteLLMCacheType
+
+
+class TestDiskCacheUnitTests(LLMCachingUnitTests):
+    def get_cache_type(self) -> LiteLLMCacheType:
+        return LiteLLMCacheType.DISK
+
+
+# if __name__ == "__main__":
+#     pytest.main([__file__, "-v", "-s"])