Project 1 - V&V SW Analysis - I
Black Box Testing is a software testing method in which the functionalities of software applications are tested without having knowledge of internal code structure, implementation details and internal paths. Black Box Testing mainly focuses on input and output of software applications and it is entirely based on software requirements and specifications. It is also known as Behavioral Testing.
How to do BlackBox Testing
Here are the generic steps followed to carry out any type of Black Box Testing.
- Initially, the requirements and specifications of the system are examined.
- Tester chooses valid inputs (positive test scenario) to check whether SUT processes them correctly. Also, some invalid inputs (negative test scenario) are chosen to verify that the SUT is able to detect them.
- Tester determines expected outputs for all those inputs.
- Software tester constructs test cases with the selected inputs.
- The test cases are executed.
- Software tester compares the actual outputs with the expected outputs.
- Defects if any are fixed and re-tested.
Types of Black Box Testing
There are many types of Black Box Testing but the following are the prominent ones –
- Functional testing – This black box testing type is related to the functional requirements of a system; it is done by software testers.
- Non-functional testing – This type of black box testing is not related to testing of specific functionality, but non-functional requirements such as performance, scalability, usability.
- Regression testing – Regression testing is done after code fixes, upgrades or any other system maintenance to check the new code has not affected the existing code.
Black Box Testing Techniques
Following are the prominent Test strategy amongst the many used in Black box Testing
- Equivalence Class Testing: It is used to minimize the number of possible test cases to an optimum level while maintains reasonable test coverage.
- Boundary Value Testing: Boundary value testing is focused on the values at boundaries. This technique determines whether a certain range of values are acceptable by the system or not. It is very useful in reducing the number of test cases. It is most suitable for the systems where an input is within certain ranges.
- Decision Table Testing: A decision table puts causes and their effects in a matrix. There is a unique combination in each column.
Write a Test plan to test features of a new mobile phone (Blackbox test) that needs to be implemented based on the following requirements. (The product is still under development stage and is yet to be UA (User Acceptance ) tested .Every other thing to be included in the test plan can be hypothetical.
if(owner long press the power button)
{
open the company logo at centre;
}
else if(customer press the power button)
{
open the apps in grid;
}
else if(owner power on the phone)
{
shows call the phone icon on first position at bottom;
}
else if(owner power on the phone)
{
shows Dictionary icon on second position at bottom;
}
else if( owner click on call the phone icon)
{
contacts appears in alphabetical order;
}
else if(owner click on Dictionary icon)
{
search bar appears at centre;
}
else if(owner long press power on button)
{
displays Good-Bye and gets switched off;
}
else if(owners phone font)
{
always in calibri with size of 12;
}
else if(owner click the camera icon
{
open the camera app and ready to click the photo
}
else if(customer requirement touch responsive)
{
reflects on touch;
}
else ( customer requirement no hard buttons)
{
touch screen sensitive;
}