Endless jasmine timeout

Question

Endless jasmine timeout

This question is a continuation of a discussion on the Remove timeout for single jasmine spec GitHub issue.

Query:

Can a single test be configured to never time out?

The Issue:

While it's possible to set a global timeout value using DEFAULT_TIMEOUT_INTERVAL, or set timeouts for each describe block with beforeEach/afterEach, or even on an individual it() block like below:

it('Has a custom timeout', function() {
  expect(true).toBeTruthy();
}, timeout value in milliseconds)

I'm specifically looking to prevent a single test from timing out indefinitely. I tried following the suggestion from the GitHub issue by using Infinity:

it('Has a custom timeout', function() {
  expect(true).toBeTruthy();
}, Infinity)

However, I encountered this error immediately after the test entered the it() block:

Error: Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL

It seems that using Infinity as a timeout value may not be allowed, or I might be missing something.

For now, I can use a large hardcoded number as a workaround, but I'd prefer to find a better solution.

javascript testing jasmine protractor

Answer 1

Answer №1

Jasmine utilizes the setTimeout function to wait for test specifications to complete within a specified time frame.

In response to the question found on Why does setTimeout() "break" for large millisecond delay values?:

The issue lies in setTimeout using a 32-bit integer to store the delay time

...

When timeout values exceed what can be stored in a signed 32-bit integer, it may cause overflow in browsers like Firefox, Safari, and Chrome, leading to an immediate scheduling of the timeout event. In such cases, it is more practical not to set these timeouts given that expecting a browser window to stay open for 24.8 days is unreasonable.

An overflow occurs once Infinity surpasses any other number.

The maximum safe integer in this scenario is 2³¹-1 = 2147483647. This finite value ensures that the test will not run infinitely, despite the threshold of 24.8 days being already extensive.

To handle this effectively, you can define a constant to hold this value:

jasmine.DEFAULT_TIMEOUT_INTERVAL = 2000;

var MAX_SAFE_TIMEOUT = Math.pow(2, 31) - 1;

describe('suite', function () {

  it('should work within a defined period', function (done) {

    setTimeout(function () {
      expect(true).toBe(true);
      done();
    }, 3000)

  }, MAX_SAFE_TIMEOUT);

});

For a demonstration, refer to this working sample

Answer 2

Jasmine utilizes the setTimeout function to wait for test specifications to complete within a specified time frame.

In response to the question found on Why does setTimeout() "break" for large millisecond delay values?:

The issue lies in setTimeout using a 32-bit integer to store the delay time

...

When timeout values exceed what can be stored in a signed 32-bit integer, it may cause overflow in browsers like Firefox, Safari, and Chrome, leading to an immediate scheduling of the timeout event. In such cases, it is more practical not to set these timeouts given that expecting a browser window to stay open for 24.8 days is unreasonable.

An overflow occurs once Infinity surpasses any other number.

The maximum safe integer in this scenario is 2³¹-1 = 2147483647. This finite value ensures that the test will not run infinitely, despite the threshold of 24.8 days being already extensive.

To handle this effectively, you can define a constant to hold this value:

jasmine.DEFAULT_TIMEOUT_INTERVAL = 2000;

var MAX_SAFE_TIMEOUT = Math.pow(2, 31) - 1;

describe('suite', function () {

  it('should work within a defined period', function (done) {

    setTimeout(function () {
      expect(true).toBe(true);
      done();
    }, 3000)

  }, MAX_SAFE_TIMEOUT);

});

For a demonstration, refer to this working sample

Endless jasmine timeout

Answer №1

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