白盒测试方法的实例演示

Article Summary

Introduction to Unit Testing:

Unit testing is a type of software testing where test cases are designed and executed for individual code units, such as functions, classes, or modules. The goal of unit testing is to ensure the correctness, isolation, and robustness of these code units.

Understanding White Box Testing:

White box testing is a software testing technique that involves full access to the internal structure and implementation details of the code. It includes various coverage techniques such as statement, decision, condition, decision/condition, combination, and path coverage, which are designed to execute every line, condition, branch, combination of parameters, and possible execution path in the code.

Relationship between Unit Testing and White Box Testing:

Unit testing is closely related to white box testing as the latter's techniques are often employed in designing and executing unit tests. White box testing enables testers to create effective test cases targeting the code's internal structure, thus improving the coverage and efficacy of unit tests. By employing white box testing, unit tests can ensure all statements, conditions, and paths are executed, identify logical errors and implementation flaws, and enhance the code's robustness, reliability, maintainability, and testability.

Code Examples of White Box Testing:

• Statement Coverage: A function with two print statements is executed to cover both statements.
• Decision Coverage: A function with an if-else construct is tested with values to cover both the if and else branches.
• Condition Coverage: A function with multiple conditions is tested with values to ensure each condition evaluates to both true and false.
• Decision/Condition Coverage: A function with nested if statements is tested with values to cover all possible true and false evaluations of the conditions and their combinations.
• Combination Coverage: A function is tested with all combinations of parameters covering positive, zero, and negative values.
• Path Coverage: A function with an if-else path is tested with values to cover both the true path, the false path, and the end statement.