Basics of Software testing

created By: Aarif Habeeb

Software TestingCreated By: Aarif Habeeb

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Introduction Goals of Testing Objectives of testing Levels of Testing Test Types VERIFICATION & VALIDATION The testing process Testing phases Software Testing Difficulties Stages of Testing Conclusion Reference Question Contact us

Agenda


What is Software Testing?

Executing software in a simulated or real environment, using inputs selected somehow.

Introduction



Detect faults Establish confidence in software Evaluate properties of software

◦ Reliability◦ Performance◦ Memory Usage◦ Security◦ Usability

Goals of Testing



To understand testing techniques that are geared to discover program faults

To introduce guidelines for interface testing To understand specific approaches to object-oriented

testing To understand the principles of CASE tool support for

testing Executing a program with the intent of finding an error. To check if the system meets the requirements and be

executed successfully in the Intended environment. To check if the system is “ Fit for purpose”. To check if the system does what it is expected to do.

Objectives of testing


A good test case is one that has a probability of finding an as yet undiscovered error.

A successful test is one that uncovers a yet undiscovered error.

A good test is not redundant. A good test should be “best of breed”. A good test should neither be too simple nor

too complex.

Continue…….Objective



Unit Testing Integration Testing Validation Testing

◦ Regression Testing◦ Alpha Testing◦ Beta Testing

Acceptance Testing

Levels of Testing



Functional tests Algorithmic tests Positive tests Negative tests Usability tests Boundary tests Startup/shutdown tests Platform tests Load/stress tests

Test Types



Verification - typically involves reviews and meeting to evaluate documents, plans, code, requirements, and specifications. This can be done with checklists, issues lists, walkthroughs, and inspection meeting.

Validation - typically involves actual testing and takes place after verifications are completed.

Validation and Verification process continue in a cycle till the software becomes defects free.

VERIFICATION & VALIDATION


Component testing ◦ Testing of individual program components◦ Usually the responsibility of the component

developer (except sometimes for critical systems)◦ Tests are derived from the developer’s experience

Integration testing◦ Testing of groups of components integrated to

create a system or sub-system◦ The responsibility of an independent testing team◦ Tests are based on a system specification

The testing process



Testing phases

Componenttesting

Integrationtesting

Software developer Independent testing team


Testing in the Small

Unit Testing Feature Testing Integration Testing

Unit TestingTests the smallest individually executable code units.Usually done by programmers. Test cases might be selected based on code, specification, intuition, etc.

Tools: Test driver/harness Code coverage analyzer Automatic test case generator

Stages of Testing


Integration TestingTests interactions between two or more units or components. Usually done by programmers. Emphasizes interfaces.

Issues: In what order are units combined? How do you assure the compatibility and

correctness of externally-supplied components?


Most of the software testing literature equates testcase selection to software testing but that is just onedifficult part. Other difficult issues include:

Determining whether or not outputs are correct. Comparing resulting internal states to expected

states. Determining whether adequate testing has been

done. Determining what you can say about the software

when testing is completed. Measuring performance characteristics. Comparing testing strategies.

Software Testing Difficulties


Testing in the Large System Testing End-to-End Testing Operations Readiness Testing Beta Testing Load Testing Stress Testing Performance Testing Reliability Testing Regression Testing

Stages of Testing


Conclusion


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Reference


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Questions


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