See installing in documentation.
Code:
import lest
@lest.setup
def my_setup():
print('Setup ran!')
@lest.register
def test_adding_two_and_two():
lest.assert_eq(2 + 2, 4)
@lest.register
def some_error_test():
lest.assert_eq(2 + 2, 5) # AssertionError
@lest.register
def some_more_error():
lest.assert_eq(a + 2, 4) # NameError
lest.run(info_level='max')
Output (to visible the highlighting, it's a print-screen):