diff --git a/test/index_test.js b/test/index_test.js
index <HASH>..<HASH> 100644
--- a/test/index_test.js
+++ b/test/index_test.js
@@ -18,6 +18,8 @@ describe('cleanDeep()', () => {
         bar: undefined,
         baz: true,
         biz: false,
+        buz: null,
+        net: '',
         qux: 100
       }
     };
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