Import a module one step back of the path

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Look at this post for advice.
So test folder and tests should advisable be outside of the package folder.
Then import stuff from package folder and test it outside of the package.

Kindly help me how can we import this without using sys path

Maybe you misunderstand how sys.path work,Python can not find anything whiteout it.
When make package so should project folder be in sys.path the will Python find package(all files and sub-folder) and test folder.
So Python only need to find the project folder,in example in post i make virtual environment(sys.path set as default to folder to project folder).
One more example A sample Python project.