enzymejs/enzyme

Silently failing tests with JSDOM

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#621 opened on Oct 3, 2016

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Description

This is likely closely related to #543.

My mocha test suite runs after a setup script.

The problem is that examples fail silently if document.defaultView.XMLHttpRequest is assigned to global.XMLHttpRequest.

Similarly, I worked around it with

if (typeof global[property] === 'undefined' && property !== 'XMLHttpRequest') {
  global[property] = document.defaultView[property];
}

I can't really pinpoint the root cause of this, but if nothing else it may be worthwhile to update the JSDOM guide.

Contributor guide

Tech stack
javascriptreactnodejs
Domain
testingdocumentation
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Basic knowledge of enzymeFamiliarity with JSDOM setup
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate the root cause of silent test failures when global.XMLHttpRequest is assigned from JSDOM's document.defaultView. Refer to related issue #543 for additional context. Consider updating the JSDOM usage guide in enzyme's documentation to include the workaround described in the issue.