Blackbox vs Whitebox Testing
In BlackBox testing, the internal design or implementation of the item being tested is not known to the tester. It mainly focuses on the behavior of the software by testing it from the end-user perspective. It is considered as high-level testing. It is also called data-driven testing.
Black box testing is all about enhancing the user experience. Here testing is based on external expectations. The major testing will be around possible inputs and expected outputs.
Types of Blackbox Testing
- Functional Testing
- Non-functional Testing
Test Approach of Blackbox Testing
Black box testing can broadly be summarized into the following steps.
- The first step is to understand and analyze user requirements and system specifications.
- Through prototype or available user workflows, the tester explores the UI and understand how the functionality of the system is expected to work.
- The tester writes test scenarios and test cases based on the requirements and user workflows.
- The next step is a test case execution with different input parameters which further compares with the expected output to check the efficiency of the system.
- The bug raised for the failed test cases is fixed by the developer and re-testing is done.
In Whitebox testing, the internal design or implementation of the item being tested is known to the tester. It focusses on checking the internal functioning of the software. It is considered as low-level testing. It is also called a glass box, transparent box, clear box, or codebase testing.
Automation Whitebox test cases are easy as the internal implementation of the application is disclosed. Here the expectation is to check the quality and performance of the application by executing the code of the application.
Types of Whitebox Testing
- Path Testing
- Loop Testing
- Condition Testing
Test Approach for Whitebox Testing
White box testing can be summarized as below:
- The first step is to understand the source code.
- The next step is to derive the test cases through different test design techniques.
- Test Framework is defined and the environment setup is done next.
- Writing code to test the application through code with suitable inputs.
Difference between Blackbox and Whitebox Testing
|Blackbox Testing||Whitebox Testing|
|In this type, the internal structure or the program or the code is hidden from the tester||In this type, the tester has knowledge about the internal structure of the code or the program of the software.|
|It is a functional test of the software.||It is a structural test of the software.|
|It is ideal for higher levels of testing like System Testing, Acceptance testing.||It is ideal for lower levels of testing like Component testing|
|The testing is initiated based on the requirement specifications document.||The testing is initiated based on the design document.|
|The main objective of this testing is to check what functionality of the system under test.||The main objective of this testing is to check the quality of the code.|
|Testing can be performed only using the GUI.||Testing can be started prior to the implementation of the GUI.|
|Programming knowledge is not required.||Programming knowledge is mandatory.|
|Testing is based on external expectations||The expectation is to check the quality and performance of the application|
|It is based on trial and error methods.||Data domain and internal boundaries can be tested.|
|It is at least time-consuming.||It is the most time-consuming.|
|No knowledge of implementation is needed.||Knowledge of implementation is needed.|
|Code related errors cannot be identified or technical errors cannot be identified.||Helps to identify the hidden errors and optimizing code.|
|It is easy to identify missing functionalities as the scope of the testing is huge.||Missing functionalities cannot be identified as the scope is only to test the implemented feature|
|It is performed by end-users, testers, and sometimes developers||It is performed by developers and testers|