Callbacks in Laika tests go untriggered

Question

Callbacks in Laika tests go untriggered

Meteor.collection.insert() allows for the use of a callback as one of its arguments. To demonstrate, you can start a new Meteor project and execute the following code in the browser's console.

my_collection = new Meteor.Collection("myCollection");
my_collection.insert(
    {some: "object"},
    function() {
        console.log("finished insertion");
    })

However, when I try to include this code in a Laika test, the callback parameter does not seem to be executed. Below is my testing code:

suite('testing Laika out', function() {
    test('inserting into collection', function(done, server, client) {
        client.eval(function() {
            my_collection = new Meteor.Collection("myCollection");
            my_collection.insert(
                {some: "object"},
                function() {
                    console.log("finished insertion");
                    done();
                })
        })
    })
})

Does anyone know why the callback function isn't being triggered in this Laika test? This issue appears to extend beyond just Meteor.collection.insert().

(I am using Ubuntu 13.04, Meteor 0.7.0.1, Laika 0.3.1, PhantomJS 1.9.2-6)

javascript meteor laika

Answer 1

Answer №1

The issue arises when you attempt to execute done(); within your insert callback, even though it is not defined in that specific function scope. The correct approach is to monitor the insertion into my_collection and trigger a signal that can be intercepted by either the client or server (in this instance, the client). Also, remember not to initialize your collection within your test; this should be handled in your production code.

Consider implementing the following solution instead:

var assert = require("assert");

suite('testing Laika out', function() {
    test('inserting into collection', function(done, server, client) {

        client.eval(function() {
            addedNew = function(newItem) {
                console.log("finished insertion");
                emit("done", newItem)
            };
            my_collection = new Meteor.Collection("myCollection");
            my_collection.find().observe({
                added: addedNew
            });
            my_collection.insert(
               {some: "object"}
            )
        }).once("done", function(item) {
            assert.equal(item.some, "object");
            done();
        });
    });
})

Refer to https://github.com/arunoda/hello-laika for fundamental testing examples.

Answer 2

The issue arises when you attempt to execute done(); within your insert callback, even though it is not defined in that specific function scope. The correct approach is to monitor the insertion into my_collection and trigger a signal that can be intercepted by either the client or server (in this instance, the client). Also, remember not to initialize your collection within your test; this should be handled in your production code.

Consider implementing the following solution instead:

var assert = require("assert");

suite('testing Laika out', function() {
    test('inserting into collection', function(done, server, client) {

        client.eval(function() {
            addedNew = function(newItem) {
                console.log("finished insertion");
                emit("done", newItem)
            };
            my_collection = new Meteor.Collection("myCollection");
            my_collection.find().observe({
                added: addedNew
            });
            my_collection.insert(
               {some: "object"}
            )
        }).once("done", function(item) {
            assert.equal(item.some, "object");
            done();
        });
    });
})

Refer to https://github.com/arunoda/hello-laika for fundamental testing examples.

Answer 3

Answer №2

Greetings, Mr. jonS90! Should you decide to execute Laika while utilizing the --verbose option, it would come to your attention that an exception is discreetly raised:

[client log] An error occurred when attempting to deliver the result of calling '/myCollection/insert': ReferenceError: Unable to locate variable: done

The issue lies in the fact that you do not have access to done() within that particular scope. Here's a revised version of your code:

test('inserting into collection', function(done, server, client) {
    client.eval(function() {
        my_collection = new Meteor.Collection("myCollection");

        finishedInsertion = function () {
            console.log("finished insertion");
            emit('done')
        }
        my_collection.insert(
            {some: "object"},
            finishedInsertion)
    })
    client.once('done', function() {
        done();
    })
})

Answer 4

Greetings, Mr. jonS90! Should you decide to execute Laika while utilizing the --verbose option, it would come to your attention that an exception is discreetly raised:

[client log] An error occurred when attempting to deliver the result of calling '/myCollection/insert': ReferenceError: Unable to locate variable: done

The issue lies in the fact that you do not have access to done() within that particular scope. Here's a revised version of your code:

test('inserting into collection', function(done, server, client) {
    client.eval(function() {
        my_collection = new Meteor.Collection("myCollection");

        finishedInsertion = function () {
            console.log("finished insertion");
            emit('done')
        }
        my_collection.insert(
            {some: "object"},
            finishedInsertion)
    })
    client.once('done', function() {
        done();
    })
})

Callbacks in Laika tests go untriggered

Answer №1

Answer №2

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