diff --git a/shroom_internals/cache_test.go b/shroom_internals/cache_test.go
index b8e51fc..08165ad 100644
--- a/shroom_internals/cache_test.go
+++ b/shroom_internals/cache_test.go
@@ -25,6 +25,13 @@ func TestCache(t *testing.T) {
 						if len(result) != expected {
 							t.Errorf("invalid read len %d != %d\n", len(result), expected)
 						}
+						if expected < 0 {
+							for k, v := range result {
+								if v.Time != uint64(k+j) {
+									t.Errorf("incorrect time %d != %d\n", v.Time, j+k)
+								}
+							}
+						}
 					}
 				} else {
 					if result != nil {