CODEWITHSUNDEEP
javascriptunit-testingasynchronousjasmine
Matt Lishman
Matt Lishman

Reputation: 1817

Jasmine 2.0 done and afterEach

I am using jasmine 2.0.

I am trying to understand the done() function.

With the following basic jasmine code:

describe('Jasmine 2.0 done()', function() {

    beforeEach(function () {
        console.log('install');
        jasmine.clock().install();
    });

    afterEach(function () {
        console.log('uninstall');
        jasmine.clock().uninstall();
    });


    it('should wait 1ms then complete', function (done) {

        setTimeout(function(){
            console.log('async');
            expect(true).toBe(true);
            done();      
        }, 1)

    });

});

What I think I see happen:

I would expect that

I think this because the documentation says

And this spec will not complete until its done is called.

So I assumed afterEach would wait until done() is called to execute.

I have tried adding done() in the afterEach too

afterEach(function (done) {
    console.log('uninstall');
    jasmine.clock().uninstall();
    done();
});

This made no difference.

Why does this test not succeed?

What am I not understanding about the done() function?

plunker to show the problem

Upvotes: 0

Views: 2667

Answers (2)

Stubb0rn
Stubb0rn

Reputation: 1402

When jasmine's mock clock is installed setTimeout behavior is overridden. Calls to any registered callback are triggered when the clock is ticked forward via the jasmine.clock().tick function, which takes a number of milliseconds (link to jasmine docs)

Calls to any registered callback are triggered when the clock is ticked forward via the jasmine.clock().tick function, which takes a number of milliseconds.

In your case test spec would look like this: 

describe('Jasmine 2.0 done()', function() {

    beforeEach(function () {
        console.log('install');
        jasmine.clock().install();
    });

    afterEach(function () {
        console.log('uninstall');
        jasmine.clock().uninstall();
    });


    it('should wait 1ms then complete', function (done) {

        setTimeout(function(){
            console.log('async');
            expect(true).toBe(true);
            done();      
        }, 1);

        jasmine.clock().tick(1);
    });

});

Upvotes: 2

d_z90
d_z90

Reputation: 1263

With Jasmine asynchronous testing, we have to call the async code in the beforeEach() and afterEach() function that runs before each it() function block within a describe() function block.

This means that the done() callback has to be called within the above mentioned methods, else the test will become synchronous and it blocks the calling thread if it exceeds the timeout interval.

beforeEach(function (done) {
    console.log('install');
    jasmine.clock().install();
    done(); 
});

afterEach(function (done) {
    console.log('uninstall');
    jasmine.clock().uninstall();
    done(); 
});

Here is a working JSFiddle.

Upvotes: 1

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