Difficulty testing asynchronous function

Question

Difficulty testing asynchronous function

I'm trying to learn Mocha and am having trouble dealing with asynchronous code.

I would like to create a test database, populate it with some data, and then write some tests. My issue is that I can not figure out how to require that my test database be created and populated before additional tests are run. Here's the basic structure of my code:

describe('Database', function() {

  // create the DB and populate it with some test data
  iniDB(dbName, function(db) {
    addDataToDB(db, table, data);
  });


  // tests below here

});

From reading the documentation, it seems that I need to use before to ensure that my asynchronous code runs prior to my tests. To attempt this, I tried using something like this:

describe('Database', function() {

  before(function(done) {
    iniDB(dbName, function(db) {
      addDataToDB(db, table, data);
    });
    done();
  });

  // tests below here

});

How can I tell Mocha to first create and populate my database before running subsequent tests?

node.js
mocha

Answer 1

Using before() is the right solution, just invoke done() when all your data has finished writing. Something like this:

before(function(done) {
  iniDB(dbName, function(db) {
    addDataToDB(db, table, data, function() {
      done();
    });
  });
});