Add testing information to readme (#10)

* Add testing information to readme

* Refactor readme

* Example usage in readme

* Update README.md

Co-authored-by: PiotrJunior <[email protected]>

* fixes from PR comments

---------

Co-authored-by: Tomasz Kwiatkowski <[email protected]>
Co-authored-by: PiotrJunior <[email protected]>
Co-authored-by: jrozek <[email protected]>

Author: 4 people

.gitignore

@@ -6,7 +6,11 @@ build
 .idea
 __pycache__
 tests/test_django/db.sqlite3
+htmlcov
 
 # pytest-cov
 .coverage*
 coverage.xml
+
+# macOS
+.DS_Store

README.md

@@ -1 +1,81 @@
+from sio3pack.graph import GraphOperation
+
 # SIO3Pack
+
+## Example usage
+
+### In OIOIOI
+
+```python
+# Package unpacking
+import sio3pack, sio3workers
+from django.conf import settings
+package = sio3pack.from_file(path_to_package, django_settings=settings)
+graph_op: GraphOperation = package.get_unpack_graph()
+results = sioworkers.run(graph_op)
+graph_op.return_results(results)
+package.save_to_db(problem_id=1)
+```
+
+### Locally (for example `sinol-make`)
+
+```python
+import sio3pack, sio3workers.local
+package = sio3pack.from_file(path_to_package)
+graph_op: GraphOperation = package.get_unpack_graph()
+results = sio3workers.local.run(graph_op)
+graph_op.return_results(results)
+```
+
+---
+
+## Development
+
+### Test without django support
+
+Install the package in editable mode and make sure that `django` and 
+`pytest-django` are not installed.
+
+```bash
+pip install -e ".[tests]"
+pip uninstall django pytest-django
+```
+
+Then follow the instructions in 
+[General testing information](#general-testing-information).
+
+
+### Test with django support
+
+Install the package in editable mode along with Django dependencies:
+
+```bash
+pip install -e ".[django,tests,django_tests]"
+```
+
+Then follow the instructions in 
+[General testing information](#general-testing-information).
+
+
+### General testing information
+
+Run the tests with `pytest` in the root directory of 
+the repository.
+
+```bash
+pytest -v
+```
+
+To run tests in parallel, use the following command.
+
+```bash
+pytest -v -n auto
+```
+
+To run coverage tests, use the following command.
+
+```bash
+pytest -v --cov=sio3pack --cov-report=html
+```
+
+The coverage report will be generated in the file `htmlcov/index.html`.

src/sio3pack/graph/graph_op.py

@@ -15,9 +15,9 @@ def __init__(self, graph: Graph, return_results: bool = False, return_func: call
                             results, if return_results is True.
         """
         self.graph = graph
-        self.return_results = return_results
+        self.should_return = return_results
         self.return_func = return_func
 
     def return_results(self, data: dict):
-        if self.return_func:
+        if self.return_func and self.should_return:
             return self.return_func(data)