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import unittest
import datetime
class TestParseExpenses(unittest.TestCase):
 def test_parse_expenses_with_valid_input(self):
 expenses_string = "2023-01-01 -34.01 USD\\n..."
 expected_output = [(datetime.datetime(2023, 1, 1), ...)]
 self.assertEqual(parse_expenses(expenses_string), expected_output)
 def test_parse_expenses_with_empty_input(self):
 expenses_string = ""
 expected_output = []
 self.assertEqual(parse_expenses(expenses_string), expected_output)
 def test_parse_expenses_with_invalid_date_format(self):
 expenses_string = "invalid-date -34.01 USD"
 with self.assertRaises(ValueError):
 parse_expenses(expenses_string)
 def test_parse_expenses_with_comments(self):
 expenses_string = "# Comment line\\n2023-01-01 -34.01 USD"
 result = parse_expenses(expenses_string)
 self.assertEqual(len(result), 1)
 def test_parse_expenses_multiple_currencies(self):
 expenses_string = "2023-01-01 -34.01 USD\\n2023-01-02 -2.59 EUR"
 result = parse_expenses(expenses_string)
 self.assertEqual(len(result), 2)
 self.assertEqual(result[0][2], "USD")
 self.assertEqual(result[1][2], "EUR")
if __name__ == "__main__":
 unittest.main()