Rethinkdb with nodejs and expresso - node.js

Question

I am trying to use rethinkdb and test it via expresso. I have function
module.exports.setup = function() {
var deferred = Q.defer();
r.connect({host: dbConfig.host, port: dbConfig.port }, function (err, connection) {
if (err) return deferred.reject(err);
else deferred.resolve();
});
return deferred.promise;
});
I am testing it like this
module.exports = {
'setup()': function() {
console.log("in setup rethink");
db.setup().then(function(){
console.log(clc.green("Sucsessfully connected to db!"));
}).catch(function(err){
console.log('error');
assert.isNotNull(err, "error");
});
}
};
And I am runing code like this
expresso db.test.js
But expresso shows error 100% 1 tests even in case of error.
I tried to put throw err; in catch, but nothing changes.
But if I put assert.eql(1, 2, "error"); in the begining of setup() it fails as expected;
Is there something, that caches errors? How can I make it fail as it should be?
For squalize I found
Sequelize.Promise.onPossiblyUnhandledRejection(function(e, promise) {
throw e;
});
Is there something like this for rethink db?

Answer 1

The problem is that this test is asynchronous, and you're treating it as a synchronous test. You need to do the following:
module.exports = {
'setup()': function(beforeExit, assert) {
var success;
db.setup().then(function(){
success = true;
}).catch(function(err){
success = false;
assert.isNotNull(err, "error");
});
beforeExit(function() {
assert.isNotNull(undefined, 'Ensure it has waited for the callback');
});
}
};
Mocha vs Express
You should consider taking a look at mocha.js, which has a much nicer API for asynchronous operations by passing the done function. The same test would look like this:
module.exports = {
'setup()': function(done) {
db.setup().then(function(){
assert.ok(true);
}).catch(function(err){
assert.isNotNull(err, "error");
})
.then(function () {
done();
});
}
};
Promises
The first function you wrote can be re-written in the following manner, because the RethinkDB driver, by default, returns a promise on all operations.
module.exports.setup = function() {
return r.connect({host: dbConfig.host, port: dbConfig.port });
});