message: Check getNumOfUniqueTokens() in tests before and after issuance
diff: @@ -38,6 +38,10 @@ describe("Net Emissions Token Network", function() {
  let registerConsumer = await contract.connect(dealerAddress).registerConsumer(consumerAddress.address);
  expect(registerConsumer);
  + // check number of unique tokens before issuance
  + let numUniqueTokensBefore = await contract.getNumOfUniqueTokens()
  + .then((response) => expect(response).to.equal(0));
  +
  let issue = await contract
  .connect(dealerAddress)
  .issue(
  @@ -71,6 +75,10 @@ describe("Net Emissions Token Network", function() {
  // Check to be certain mint did not return errors
  expect(issue2);
  + // check number of unique tokens after issuance
  + let numUniqueTokensAfter = await contract.getNumOfUniqueTokens()
  + .then((response) => expect(response).to.equal(2));
  +
  // Get ID of first issued token
  let transactionReceipt = await issue.wait(0);
  let issueEvent = transactionReceipt.events.pop();
  