Add exercise for debugging strategies

_quarto.yml

@@ -47,7 +47,7 @@ website:
           - "exercises/programming_paradigms.qmd"
           - "exercises/data_structures.qmd"
           - "exercises/complexity.qmd"
-          # - "exercises/debugging-strategies.qmd"
+          - "exercises/debugging-strategies.qmd"
           # - "exercises/good_scientific_practice.qmd"
           # - "exercises/user_experience.qmd"
           # - "exercises/testing.qmd"

exercises/debugging-strategies.qmd

+---
+title: "Debugging strategies"
+---
+
+### Explain your approach on locating bugs
+
+_The tasks should be done using the test repository <https://github.com/gweis/isodate>,
+specifically commit 8856fdf0 (HEAD of `master` branch at the moment of writing this)._
+
+_It is a Python library to parse date and times according to the ISO 8601 standard.
+Although it works great in many use cases, there are some documented bugs in the code.
+But the linked repository was not chosen to cast a bad light on it in any way.
+In fact, it does a good job providing tests and stating which problems still occur in the code._
+
+**Tasks**
+
+1. Check out the code and run the test suite. This can typically be done by issueing
+`python -m unittest` in the `src/isodate` directory (not within the `tests` directory).
+You should find that it reports two failures and one error.
+Document the actual output stating that.
+
+2. Pick one of the three issues and investigate it. Narrow down the code area, where the issue occurs.
+Document your strategy of narrowing it down step by step.
+**This task is NOT about fixing any of the issues^[You can try, if you want. But this is NOT part of the homework]!**