wip: fix ci test on test that throws error

Author: emilygilberts

tests/mapreduce/test.mapreduce.js

@@ -1132,7 +1132,7 @@ function tests(suiteName, dbName, dbType, viewType) {
         await db.query(queryFun, {reduce: true, group: true});
         throw new Error('should fail');
       } catch (err) {
-        err.message.should.be.a('string');
+        err.message.should.include('_product');
       }
     });