public void SanitizeKey_Should_Replace_Invalid_Chars_In_Key()
        {
            // invalid chars: '/', '\\', '?', '#'
            var sanitizedKey = CacheEntity.SanitizeKey("/k\\e?y#");

            Assert.Equal("_k_e_y_", sanitizedKey);

            sanitizedKey = CacheEntity.SanitizeKey("_key_/\\?#");
            Assert.Equal("_key_____", sanitizedKey);

            sanitizedKey = CacheEntity.SanitizeKey("#\\k?#e/\\y?/");
            Assert.Equal("__k__e__y__", sanitizedKey);
        }