A query using VALUES is probably a good candidate, something like this:

SELECT ?item ?itemLabel ?other WHERE {
  VALUES (?item ?itemLabel ?other) {
    (wd:Q42 "Douglas Adams"@en "1952-03-11T00:00:00Z"^^xsd:dateTime)
    (wd:Q80 "Tim Berners-Lee"@de <http://commons.wikimedia.org/wiki/Special:FilePath/Sir%20Tim%20Berners-Lee%20%28cropped%29.jpg>)
  }
}

And we could check that the result shows a table and that the following strings appear somewhere in it:

• wd:Q42 (item IDs are abbreviated)
• Douglas Adams
• March 11, 1952 (date values are rendered)
• wd:Q80
• Tim Berners-Lee (non-English values are supported)
• commons:Sir Tim Berners-Lee (cropped).jpg (Commons links are abbreviated)

Change 499491 had a related patch set uploaded (by Greta WMDE; owner: Greta Doçi):
[wikidata/query/gui@master] Add integration test for embed.html using wdio

https://gerrit.wikimedia.org/r/499491

We added only one test to make sure that embed.html its functioning for now. More tests can be added as needed.

Change 499491 merged by jenkins-bot:
[wikidata/query/gui@master] Add integration test for embed.html using wdio

https://gerrit.wikimedia.org/r/499491

In T212649#4982123, @Lucas_Werkmeister_WMDE wrote:

And we could check that the result shows a table and that the following strings appear somewhere in it:

• wd:Q42 (item IDs are abbreviated)
• Douglas Adams
• March 11, 1952 (date values are rendered)
• wd:Q80
• Tim Berners-Lee (non-English values are supported)
• commons:Sir Tim Berners-Lee (cropped).jpg (Commons links are abbreviated)

At the moment, the test doesn’t implement these checks, it just checks whether any query results are present at all. Is that enough to close this task?