Catch http exception on server start

[martin-doyle]

Unfortunately, #731 only caught the MQTT server errors. For the HTTP server there is an additional change necessary. A unit test is provided.

[martin-doyle]

Sure. I will be out for a week. So, it might take some time.Am 25.03.2018 1:06 vorm. schrieb Matteo Collina notifications@github.com:@mcollina commented on this pull request.

In test/server_error.js:

• it('should get MQTT port Error: listen EADDRINUSE', function (done) {
• this.timeout(10000); // have to wait for the inject with delay of two seconds
• instance = new mosca.Server(moscaSettings(), function (err, server) {
• expect(server === instance).to.be.true;
• });
• secondInstance = new mosca.Server(moscaSettings(), function (err, server) {
• expect(server === secondInstance).to.be.true;
• });
• secondInstance.on('error', function (err) {
• expect(err.toString().substr(0, 24)).to.be.equal('Error: listen EADDRINUSE');
• done();
• });
• });
• it('should get HTTP port Error: listen EADDRINUSE', function (done) {
• this.timeout(10000); // have to wait for the inject with delay of two seconds
• instance = new mosca.Server(moscaSettings(), function (err, server) {

can you please add an assertion that checks that err is null or undefined? Also in all other cases.

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[martin-doyle]

CI tests failed but for other reasons.