Wildcard in expected result values

[tommy]

I want to validate if a field with a datetime exists. What do I write in the “expected result” field? Is there some kind of wildcard? Is this documented somewhere?

[r.candrian]

Hi @tommy , could you please provide us with more context or the transformer that you already used?

[tommy]

I want to test a transformer which creates following output;

{
  "datetime": "2025-08-22 12:07:36.388257"
}

So in the test, I want to validate if the key datetime exists. But the value is variable.

[r.candrian]

Unfortunately, that’s not possible. When using the “Expected” feature, you need to define the exact Key and Value.

[catalin]

@tommy

{
  "datetime": "2025-08-22 12:07:36.388257"
}

Either use a conditional to check the valid date time
Or validate it with a regex.
In this case validDatetime is defined false before the validation.