Flaky Cypress test: wbui2025 time datatypes: mobile view - time datatype: allows adding time statement to empty item, displays statement and supports full editing workflow
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	Lucas_Werkmeister_WMDE
	Feb 2 2026, 11:57 AM

Description

Seen in this build (kept forever) for this unrelated Translate change:

  1) wbui2025 time datatypes
       mobile view - time datatype
         allows adding time statement to empty item, displays statement and supports full editing workflow:
     Error: The following error originated from your application code, not from Cypress. It was caused by an unhandled promise rejection.

  > missingparam

When Cypress detects uncaught errors originating from your application it will automatically fail the current test.

This behavior is configurable, and you can choose to turn this off by listening to the `uncaught:exception` event.

https://on.cypress.io/uncaught-exception-from-application
      at makeErrFromObj (http://127.0.0.1:9413/__cypress/runner/cypress_runner.js:77431:12)
      at errorFromProjectRejectionEvent (http://127.0.0.1:9413/__cypress/runner/cypress_runner.js:77756:10)
      at Object.errorFromUncaughtEvent (http://127.0.0.1:9413/__cypress/runner/cypress_runner.js:77761:65)
      at <unknown> (http://127.0.0.1:9413/__cypress/runner/cypress_runner.js:141894:66)

screenshot:

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Status	Assigned	Task
Open	None	T394621 [MEX] Mobile Editing Experience of Items Project
Open	None	T415326 [MEX] M5 - additional functionality and clean up
Open	None	T398036 [MEX] M5 - Testing
Open	None	T416160 Flaky Cypress test: wbui2025 time datatypes: mobile view - time datatype: allows adding time statement to empty item, displays statement and supports full editing workflow

Event Timeline

Lucas_Werkmeister_WMDE created this task.Feb 2 2026, 11:57 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 2 2026, 11:57 AM

I have no idea how a missingparam error could be flaky, surely we’re always calling the API with a consistent set of parameters…

Other failed builds:

2026-02-02

Lucas_Werkmeister_WMDE mentioned this in T411266: Flaky Cypress test: wbui2025 entityId datatypes (item, property): mobile view - property datatype: allows adding property statement to empty item, displays statement and supports full editing workflow.Feb 2 2026, 1:55 PM

karapayneWMDE moved this task from Incoming to MEX Incoming column on the Wikidata-Omega board.Tue, Feb 10, 5:19 PM

karapayneWMDE added a parent task: T398036: [MEX] M5 - Testing.Tue, Feb 10, 5:22 PM

karapayneWMDE moved this task from MEX Incoming column to Ready for Task Time (Story Writing) on the Wikidata-Omega board.

karapayneWMDE moved this task from Ready for Task Time (Story Writing) to MEX Incoming column on the Wikidata-Omega board.Tue, Feb 17, 8:13 AM

Noting that this is still seen, e.g. on this CI build for this ConfirmEdit patch.

The screenshot of that build looks slightly different than in the task description:

But I just noticed something: the API request seen in both screenshots really is invalid!

{
  "errors": [
    {
      "code": "missingparam",
      "module": "wbformatvalue",
      "*": "The \"datavalue\" parameter must be set."
    }
  ],
  "servedby": "mw-api-ext.eqiad.main-66467fdf7d-t9fn9",
  "*": "See https://www.wikidata.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at &lt;https://lists.wikimedia.org/postorius/lists/mediawiki-api-announce.lists.wikimedia.org/&gt; for notice of API deprecations and breaking changes."
}

So we’re somehow sending a request with no datavalue at all to action=wbformatvalue.

Aha, TIL JSON.stringify( undefined ) returns undefined. So when we have

renderSnakValue()

	const params = {
		action: 'wbformatvalue',
		generate: generate,
		datavalue: JSON.stringify( dataValue )
	};

the datavalue is undefined and mw.Api strips it out. So we just™ need to make sure not to pass undefined values into the renderSnak*() functions.

	F72153640: image.png
	Tue, Feb 17, 4:16 PM

Flaky Cypress test: wbui2025 time datatypes: mobile view - time datatype: allows adding time statement to empty item, displays statement and supports full editing workflowOpen, Needs TriagePublicActions

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Event Timeline

Flaky Cypress test: wbui2025 time datatypes: mobile view - time datatype: allows adding time statement to empty item, displays statement and supports full editing workflow
Open, Needs TriagePublic
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