Unit 9 Stubs, Fakes, and Mocks

Question 1

Implement a testing suite using setUp and tearDown

Question 2

Implement a testing suite using Mocks

Question 3

Identify when using Mocks is best suited

Question 4

What is the difference between setUp/tearDown and setUpClass/tearDownClass?

Question 5

What is the difference between a Stub and a Mock?

Question 6

What does Unittest’s patch do?

Question 7

Context: Mocks

____ contain predefined data that is returned when called, but do not imitate behavior.

Answer 7

Stubs

Question 8

Context: Mocks

___ simulate the behavior of a service and its actions can be verified.

Answer 8

Mocks

Question 9

Context: Mocks

Given the following code snippet, what goes in the blank?

from unittest.mock import Mock

mock = Mock()

# Set return_value
mock.abs.______ = “7”

Answer 9

return_value

Question 10

Context: Mocks

Given the following code snippet, what is the output of the print statement?

mock = Mock()

mock.func(“Hello World”)
mock.func(“Greetings Planet”)

print(mock.func.call_args)

Answer 10

call(‘Greetings Planet’)

Question 11

Context: Mocks

Given the following snippet. If we wanted to use a mock to trigger an exception, what would we use in the blank?

Mock file reader to control its behavior

open = Mock()

def load_file():
# Does absolutely nothing other than raise the desired exception
content = open(‘temp_file.txt’)
if content.length != 0:
return content
return None

class TestCase(unittest.TestCase):
def test_read_file(self):
# Test for IOError
open.______ = IOError
# This is a context manager that allows us to test for exceptions
with self.assertRaises(IOError):
load_file()

Answer 11

side_effect

Question 12

Context: Mocks

If we want to override the behavior of an imported item, we need to use patch

Answer 12

True

Question 13

Context: Testing Environments

Which of the following is called before each test case in a TestCase object?

Answer 13

setUp()

Question 14

Context: Testing Environments

Which of the following is called after all the test cases in a TestCase Object are run (not after each test)?

Answer 14

tearDownClass()

Question 15

Context: Testing Environments

The @classmethod used with setUpClass() and tearDownClass() is called a modifier.

Answer 15

False