test: add unit tests to execute transform flow e2e

[lemorage]

resolve #618.

[lemorage]

and after #758 is resolved we won't need to define types to annotate return values for transform functions

Sorry for keeping this for so long. Said here, does that mean now we can write the code without defining NewParent here, after #758?

@cocoindex.transform_flow()
def for_each_transform(
    data: cocoindex.DataSlice[Parent],
) -> cocoindex.DataSlice[typing.Any]: # No need to specify cocoindex.DataSlice[NewParent]?
    with data["children"].row() as child:
        child["new_field"] = child["value"].transform(extract_value)
    return data
    ```

[badmonster0]

and after #758 is resolved we won't need to define types to annotate return values for transform functions

Sorry for keeping this for so long. Said here, does that mean now we can write the code without defining NewParent here, after #758?

@cocoindex.transform_flow()
def for_each_transform(
    data: cocoindex.DataSlice[Parent],
) -> cocoindex.DataSlice[typing.Any]: # No need to specify cocoindex.DataSlice[NewParent]?
    with data["children"].row() as child:
        child["new_field"] = child["value"].transform(extract_value)
    return data
    ```

No worries. Yes, that's true. We can rewrite the code without defining NewParent here.

Besides, because of #818, it's still possible that even if returning a dict it still doesn't work as intended (I'll assess #818 more closely later when got time). So if it still doesn't work after a quick try, feel free to comment out the related test first and we can merge it (it means the test is already helping us identifying issues!). Thanks!

[georgeh0]

and after #758 is resolved we won't need to define types to annotate return values for transform functions

Sorry for keeping this for so long. Said here, does that mean now we can write the code without defining NewParent here, after #758?

@cocoindex.transform_flow()
def for_each_transform(
    data: cocoindex.DataSlice[Parent],
) -> cocoindex.DataSlice[typing.Any]: # No need to specify cocoindex.DataSlice[NewParent]?
    with data["children"].row() as child:
        child["new_field"] = child["value"].transform(extract_value)
    return data
    ```

No worries. Yes, that's true. We can rewrite the code without defining NewParent here.

Besides, because of #818, it's still possible that even if returning a dict it still doesn't work as intended (I'll assess #818 more closely later when got time). So if it still doesn't work after a quick try, feel free to comment out the related test first and we can merge it (it means the test is already helping us identifying issues!). Thanks!

#818 has been fixed in #825 :)

[badmonster0]

Perfect! Thanks a lot for adding the tests!