Which of the following statements is a key principle of testing?

Correct. No matter how well developers design a product, they can only test what they know.

Testing has which of the following benefits for development?

Correct. Testing allows developers to refactor code and add new features with confidence.

At which level of the software testing process do developers test the entire software process?

Correct. In system testing, developers ensure that the entire system works together.

What is the purpose of integration testing?

Correct. The purpose of integration testing is to expose flaws in the interaction between integrated units or components.

Behavior driven development (BDD) ensures which of the following for developers?

Correct. BDD ensure that developers are building the correct software.

In the basic workflow for test driven development (TDD), what happens in the third step?

Correct. In the third step in the basic TDD workflow, developers refactor the code to improve its quality.

In which Python testing framework can you use nearly an infinite number of setup and teardown levels?

Correct. With Pytest, you can use nearly an infinite number of setup and teardown levels.

Assume you are using Python and have installed PyUnit, Nose, and Pinocchio. Which of the following commands can you use to perform unit tests and receive color-coded output?

Correct. To perform unit tests and receive color-coded output, run nosetests --with-spec --spec-color.

Which of the following PyUnit assertions is useful for determining if an object is in a result set?

Correct. The assertion assertIn(a, b) checks if “a” is in the collection known as “b.” This assertion is useful for determining if an object is in a result set.

PyUnit provides six test fixtures. Assume you include all six in a test module. Which of the following sequences shows the order in which the test runner will execute the final three test fixtures?

Correct. The last three test fixtures that the test runner will execute, in order, are tearDown, tearDownClass, and then tearDownModule.

How does a missing test coverage report help developers improve their testing?

Correct. A missing test coverage report can reveal which lines were not tested so that developers can write more test cases that execute those lines.

When generating fakes in Python, what is one advantage of using the Faker class to generate fake data?

Correct. Faker’s providers generate a large, diverse set of data for the given attribute, such as address or barcode. The larger and more diverse your test data, the more comprehensive and reliable your testing will be. You may catch many bugs for which you might not have tested otherwise.

Developers should use mocking for which of the following purposes?

Correct. Developers should mock any component to which they don’t have a remote connection if that component is important for testing.

For which of the following purposes is it useful to patch return values with data?

Correct. Patching a function’s return value with data is useful for controlling the data returned from a function call. You can pass back any data structure or object that your program expects. By using the return_value patch, you can return anything that can be sent back as a return value from a function call.