CODEWITHSUNDEEP
javascriptangularjsjasmineprotractor
axings
axings

Reputation: 133

Testing promises in protractor

I am new to the angular/protractor world so this is a really basic question. According to this spec, we can write protractor test for a web element like below:

var foo = element(by.id('foo'));
expect(foo.getText()).toEqual('Inner text');

However, foo.getText() returns a promise type, not a string, how can 'expect' compare that returned promise object against another string? Is there any documentation that explains this usage?

Upvotes: 1

Views: 363

Answers (1)

alecxe
alecxe

Reputation: 474271

Yes, the expect(), if used with Protractor, understands promises - it would resolve a promise before making an expectation making writing Protractor tests easier. This is actually done in a separate project which Protractor depends on - jasminewd2 which patches jasmine's expect() to resolve the promises and wraps jasmine's describe(), it() and other test control block functions to be executed inside the Control Flow.

Note that, it also supports promises on both sides of the assertion, you can do, for instance:

let elementText1 = $('.ng-scope p').getText();
let elementText2 = $('#transformedtext>h4').getText();

expect(elementText1).toEqual(elementText2);

As far as Protractor documentation goes, this is partially described here.

Upvotes: 4

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