#!/usr/bin/python3
# -*- coding: utf-8 -*-

import unittest


# pretend you wrote the string library for a moment:
class TestStringMethods(unittest.TestCase):
    # Returns True if the string contains 4 a.
    def test_strings_a(self) -> None:
        self.assertEqual("a" * 4, "aaaa")

    # Returns True if the string is in upper case.
    def test_upper(self) -> None:
        self.assertEqual("foo".upper(), "FOO")

    # Returns TRUE if the string is in uppercase
    # else returns False.
    def test_isupper(self) -> None:
        self.assertTrue("FOO".isupper())
        self.assertFalse("Foo".isupper())

    # Returns true if the string splits and matches
    # the given output.
    def test_split(self) -> None:
        s = "hello world"
        self.assertEqual(s.split(), ["hello", "world"])


if __name__ == "__main__":
    unittest.main(verbosity=2)