Mongoose Error - Mongoose models with same model name
I you are calling insertMany method on dbModel1, where you variable is declared to dbModel2.
Change your test 2 from:
dbModel1.insertMany(data2) .then(dbResponse1 => { // assert for count done() });
To:
dbModel2.insertMany(data2) .then(dbResponse1 => { // assert for count done() });