Add requirements-test.txt

src/README.md

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+# Run Tribler
+
+Full instruction: [install requirements](https://github.com/Tribler/tribler#setting-up-your-development-environment)
+
+```
+python3 -m pip install -r requirements.txt
+
+tribler.sh
+```
+
+# Run Tests
+
+Install all necessary dependencies:
+```
+python3 -m pip install -r requirements-test.txt
+```
+Note: `requirements-test.txt` already contains all requirements 
+from` requirements.txt`.
+
+##
+
+Export to PYTHONPATH the following directories:
+
+* tribler-common
+* tribler-core
+* tribler-gui
+
+Execute:
+```
+python3 -m pytest tribler-core
+python3 -m pytest tribler-gui --guitests
+```

src/requirements-test.txt

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+-r requirements.txt
+
+pytest
+pytest-asyncio                        
+pytest-cov                            
+pytest-mock
+pytest-randomly                        
+pytest-timeout                         
+pytest-xdist
+
+asynctest