Greater than 20

Define a function greater_than_20 that receives a number and if it is greater
than 20 returns True and if not returns False.

Examples:

>>> greater_than_20(42)
True
>>> greater_than_20(19)
False
import unittest


class GreaterThan20TestCase(unittest.TestCase):

    def test_greater_than_20(self):
        self.assertEqual(greater_than_20(42), True)

    def test_less_than_20(self):
        self.assertEqual(greater_than_20(19), False)