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We may consider these things for testing:

1. Happy path e.g. return value is correct / expected exception gets thrown / messages get published etc.
2. All if-else-switch branches.
3. Edge cases such as awkward input parameters (int.MaxValue/MinValue/0, long strings, nulls, empty strings etc).
4. The order of method calls (e.g. validation goes before we save data to the database).