Maybe add to the comment "dictionary data with non-overlapping columns, resulting in an empty DataFrame", as it is specifically this case (not just an empty dataframe)

also pls parameterize over the dtypes mentioned in the OP

in test_constructors.py there are already similar tests, please move near them

great as long as you are adding a list, can you add the rest of the types. you ca easily do this by using the types defined in pandas._testing (we also have fixtures for this, but maybe not one that covers all types); would be ok with one for that as well. Note that I don't think we have Boolean, String defined pandas._testing (could add them there)

Added more dtypes check, but now the list is very long. Any ideas on how to makes more pretty? I did not want to add it to the lists in pandas._testing, since I was not sure it would be compatible with other tests that rely on them.

you don't need to do it like this, rather use the already defined ones that are ther
e.g. ALL_EA_INT_DTYPES

Do you have any tips on how to refactor the parametrization if I use ALL_EA_INT_DTYPES? The parametrization now has the form [(input_value, expected_value)], but if I loop over ALL_EA_INT_DTYPES I think I still need to manually provide the expected value every time.

how's that? the expected IS the same as the input

of course, you can easily tranform these:

In [1]: pd.Int64Dtype().name                                                                                                                                                                                        
Out[1]: 'Int64'

so my points is that you can simply pass in the ALL_* (just concatenate them all), and check the dtypes of the result columns

Great, that already helps me a lot. But I for int this would not work since the expected is 'Int64'. Similarly for float, str.

Sorry for the large number of questions, this is my first PR :)

sure so what you can do is break this into 2 tests, one for the easy cases where this is true and one for the special cases (where you can input 2 args for input and expected)

Thanks for the feedback, I think I came to a much better test now.