Add assertions to test_last_name_year to verify output format and value constraints

[sourcery-ai]

The test for randlast in test_last_name_year currently checks that the returned value is a string, but does not verify additional constraints on the output format and value. To improve test coverage and robustness, we should add assertions to ensure:

• The returned last name is non-empty.
• The last name contains only alphabetic characters (no digits or special characters).
• The length of the last name is at least 2 characters and less than 50 characters.

Suggested code for the test:

def test_last_name_year(self):
    year = random.choice(self.last_names_year_range)
    result = randname.core.randlast(country=self.country, year=year)
    self.assertIsInstance(result, str)
    self.assertTrue(result, "Returned last name should not be empty")
    self.assertTrue(result.isalpha(), "Last name should contain only alphabetic characters")
    self.assertGreaterEqual(len(result), 2, "Last name should be at least 2 characters long")
    self.assertLess(len(result), 50, "Last name should be less than 50 characters long")

Action items:

• Update the test to include the above assertions.
• Review other similar tests to ensure output constraints are consistently checked.

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I created this issue for @ajwalkiewicz from #17 (comment).

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