How do you write a basic test case in python using unittest?

Question 2

What is unittest?

Answer 2

A built-in Python testing framework based on the xUnit architecture used for writing and running automated tests.

Question 3

How do you import unittest?

Answer 3

import unittest

Question 4

What is a Test Case?

Answer 4

The smallest unit of testing in unittest; a class that inherits from unittest.TestCase.

Question 5

What is a Test Suite?

Answer 5

A collection of test cases or test suites that are executed together.

Question 6

What is a Test Runner?

Answer 6

The component that orchestrates test execution and reports results.

Question 7

What is unittest.TestCase used for?

Answer 7

To define individual test methods and provide assertion methods for checking conditions.

Question 8

How do you define a test method?

Answer 8

Define a method inside a TestCase subclass whose name starts with test_.

Question 9

How do you run tests directly from a file?

Answer 9

Add: if __name__ == ‘__main__’: unittest.main()

Question 10

What does unittest.main() do?

Answer 10

Automatically discovers and runs all test methods in the current module.

Question 11

How do you set up code before each test?

Answer 11

Define a setUp(self) method in your test class.

Question 12

How do you clean up code after each test?

Answer 12

Define a tearDown(self) method in your test class.

Question 13

How do you run setup code once per class?

Answer 13

Use @classmethod def setUpClass(cls):

Question 14

How do you run teardown code once per class?

Answer 14

Use @classmethod def tearDownClass(cls):

Question 15

What is an Assertion Method?

Answer 15

Methods used to check for expected results (e.g., assertEqual, assertTrue, etc.).

Question 16

Example of assertEqual

Answer 16

self.assertEqual(x, y) passes if x == y.

Question 17

Example of assertTrue

Answer 17

self.assertTrue(condition) passes if condition is True.

Question 18

Example of assertFalse

Answer 18

self.assertFalse(condition) passes if condition is False.

Question 19

Example of assertRaises

Answer 19

Used to verify an exception is raised: with self.assertRaises(ValueError): func()

Question 20

Example of assertIn

Answer 20

self.assertIn(item, container) checks if item is in container.

Question 21

How do you skip a test?

Answer 21

Use @unittest.skip(‘reason’) above the test method.

Question 22

How do you conditionally skip a test?

Answer 22

Use @unittest.skipIf(condition, ‘reason’).

Question 23

How do you expect a failure?

Answer 23

Use @unittest.expectedFailure to mark tests expected to fail.

Question 24

How do you create a Test Suite manually?

Answer 24

suite = unittest.TestSuite() then suite.addTest(…).

Question 25

How do you run a Test Suite manually?

Answer 25

unittest.TextTestRunner().run(suite)

Question 26

How does test discovery work?

Answer 26

Run python -m unittest discover — it finds tests in files named test*.py.

Question 27

How can you organize tests in multiple files?

Answer 27

Use a tests/ directory and rely on test discovery or suites.

Question 28

What is the purpose of unittest.mock?

Answer 28

Provides tools to replace parts of your system under test with mock objects.

Question 29

What is patch used for in mocking?

Answer 29

Temporarily replaces a real object or function with a mock during a test.

Question 30

Can unittest run parameterized tests?

Answer 30

Not natively — must use loops or third-party libraries like parameterized.

Question 31

How do you test performance or timing?

Answer 31

Manually measure time or use other profiling tools (unittest doesn’t include timing utilities).

Question 32

What is the standard naming convention for test files?

Answer 32

Files should start or end with test (e.g. test_math.py).

Question 33

What are common assert methods?

Answer 33

assertEqual, assertNotEqual, assertTrue, assertFalse, assertIs, assertIsNone, assertIn, assertRaises.