python-multipart | A streaming multipart parser for Python | Stream Processing library

in postman switch to raw data (currently you are in form-data).
then insert your desired payload:

This is something I also noticed with the BigSur updates. Although there is an active issue for this on GitHub, a work around for the time being is to run the following command before you attempt to lock your Pipfile or install any packages. Note: this will only be effective in the terminal you run this command in.

Remove the 'foo.txt' from your request.

It should look like

When you are doing the && cat coverage.xml, I think that is getting run after the docker command is complete, not in the container. So it's like (docker run ...) && cat

To run it in the container, you could do something like docker run -it testimage sh -c 'python ... && cat /coverage.xml'

But really what you want to do is copy the xml file out of the container. Your docker cp command is using the image name (testimage), rather than the container name. When you run the container, you can supply something like --name mycontainer and then use && docker cp mycontainer:/coverage.xml ~/Development/coverage.xml

Keep in mind you will need to remove the container after each run if the name is the same.

Another option is to use a volume, so something like docker run -it -v ~/Development:/output testimage python -m pytest tests -v --cov=app --cov-report xml:/output/coverage.xml