        "should return unmodified object": function (res) {
          assert.isObject(res);
          assert.isObject(res.a);
          assert.isString(res.a.b);
          assert.equal(res.a.b, "c");
        },
NVD is only using a subset of CWE for mapping instead of the entire CWE, and the weakness type is not covered by that subset.