Software Testing and Quality Assurance Levels Quiz

Unit testing refers to testing program units in isolation, such as functions, procedures, or methods, to verify that the unit alone produces the desired result. It helps in removing dependencies on other program units and ensures that the unit performs its intended function and contains no known errors. The purpose of unit testing is to validate the correctness of individual units of code and to detect any defects early in the software development lifecycle.

Unit testing is conducted in two complementary phases: static unit testing and dynamic unit testing. Static unit testing is non-execution based and involves code review, while dynamic unit testing is execution based.

The main focus of static unit testing is on code review, which is a non-execution based approach to identify potential issues and errors in the code.

During dynamic unit testing, the activities involved include executing every line of code, executing every predicate in the unit to evaluate them as true and false separately, and observing that the unit performs its intended function and contains no known errors.

The purpose of unit testing in software development is to validate the correctness of individual units of code, remove dependencies on other program units, ensure that the unit performs its intended function, and detect any defects early in the software development lifecycle.

Executing the program unit in isolation

Invoking the unit under test with input values

Reviewing the code using techniques like inspection and walkthrough

A caller of the unit (Test Driver) and all the units called by the unit (Stub)

To test program units in isolation