Add testing document

README.md

@@ -10,6 +10,8 @@ A desktop application which can be used for playing chess, storing past games an
 
 [Architecture description](documentation/architecture_description.md)
 
+[Testing document](documentation/testing-document.md)
+
 [Timesheet](documentation/timesheet.md)
 
 ## Releases

documentation/testing-document.md

@@ -0,0 +1,19 @@
+# Testing document
+
+The application is tested using automated unit tests and manual system tests.
+
+## Automated testing
+
+Unit and integration testing covers the game logic. The tests are implemented using the [unittest](https://docs.python.org/3/library/unittest.html) framework.
+
+There are corresponding test classes for the game, board and AI classes. The rest of the game logic is tested indirectly though the aforementioned classes.
+
+### Coverage report
+
+User interface and bootstrapping code is omitted from the coverage report. As of writing this document, the test coverage is 77%:
+
+![coverage report](./img/coverage.jpg)
+
+## Manual testing
+
+System testing is done manually by installing and using the software as per the [user guide](./user-guide.md) on both Linux and Windows.