Deploying multiple instances of contract, no error but no deployment

Question

I am trying to deploy the same contract code to create multiple instance:

const contract = require('truffle-contract')

var Greeter3 = artifacts.require("Greeter3"); 

module.exports = function(deployer) {

  contract("Greeter3", async (accounts) => {
    it("should be initialized twice", async () => {
      let instance1 = await Greeter3.new();
      let instance2 = await Greeter3.new();
      assert.notEqual(instance1.address, instance2.address);

      deployer.deploy(instance1);
      deployer.deploy(instance2);
    });
  });

};

No error message is returned, but the deployment fails:

6_multi.js
==========

   > Saving migration to chain.
   -------------------------------------
   > Total cost:                   0 ETH

What does this response mean?