Testing
Testing
Testing begins at the analysis and design stages,
with prototypes being developed
It is much more cost effective...
Testing
The purpose of testing is to
to identify errors
to ensure that software is fit for purpose
to ensure that code ...
Test plan
Selecting appropriate test data sets is important, so we
need to create a test plan
Expected results should be k...
Test Data Sets
Normal
Extreme
Exceptional
Test Data Sets
Normal Data
A normal data set should be tested to show that the
program works as expected.
Test Data Sets
Extreme Data
Extreme data is used to test the boundary limits within
a program.
Test Data Sets
Exceptional Data
Exceptional data is used to test that the program can
properly handle unexpected inputs.
Comprehensive testing
Software should undergo comprehensive testing
This means testing against a range of normal,
exceptio...
Phases of testing
1. Procedure / Module Testing
Individual code procedures and modules tested
2. Integration Testing
Test ...
Who tests?
Initially, tests are carried out by the development team
Acceptance testing is carried out by the client
The...
Syntax Errors
Syntax errors are errors which appear in your code
and can be misspelled keywords or using the
language inc...
Syntax Errors
Run-time (execution) Errors
Run-time errors are those that appear when you run
your code
The syntax is correct, but the ...
Run-time (execution) Errors
Logic Errors
Logic errors are those that appear when the program
is running
They will not cause the program to crash but w...
Logic Errors
Testing removes all bugs...
...wrong!
Testing can only convince us of the presence of errors,
and not of their absence.
Te...
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National 5 Computing Science - Testing

National 5 Computing Science Testing
Published on: Mar 3, 2016
Published in: Education      
Source: www.slideshare.net


Transcripts - National 5 Computing Science - Testing

  • 1. Testing
  • 2. Testing Testing begins at the analysis and design stages, with prototypes being developed It is much more cost effective to fix problems at earlier stages of the software development process
  • 3. Testing The purpose of testing is to to identify errors to ensure that software is fit for purpose to ensure that code is efficient to ensure that code is maintainable
  • 4. Test plan Selecting appropriate test data sets is important, so we need to create a test plan Expected results should be known in advance (so the actual output can be checked against expected output)
  • 5. Test Data Sets Normal Extreme Exceptional
  • 6. Test Data Sets Normal Data A normal data set should be tested to show that the program works as expected.
  • 7. Test Data Sets Extreme Data Extreme data is used to test the boundary limits within a program.
  • 8. Test Data Sets Exceptional Data Exceptional data is used to test that the program can properly handle unexpected inputs.
  • 9. Comprehensive testing Software should undergo comprehensive testing This means testing against a range of normal, exceptional and extreme data It does not mean running a program a couple of times to find that it works OK.
  • 10. Phases of testing 1. Procedure / Module Testing Individual code procedures and modules tested 2. Integration Testing Test the modules work together 3. System Testing Test overall system 4. Acceptance Testing Customer tests program against their specification 5. Alpha and Beta Testing Put the software out to users to test
  • 11. Who tests? Initially, tests are carried out by the development team Acceptance testing is carried out by the client The final alpha and beta test are carried out by a select band of users. It is becoming common for software beta programs to be freely downloadable
  • 12. Syntax Errors Syntax errors are errors which appear in your code and can be misspelled keywords or using the language incorrectly Often software development environments will highlight syntax errors for you Syntax errors are the most common type of errors
  • 13. Syntax Errors
  • 14. Run-time (execution) Errors Run-time errors are those that appear when you run your code The syntax is correct, but the program fails to execute
  • 15. Run-time (execution) Errors
  • 16. Logic Errors Logic errors are those that appear when the program is running They will not cause the program to crash but will produce unwanted or unexpected results
  • 17. Logic Errors
  • 18. Testing removes all bugs... ...wrong! Testing can only convince us of the presence of errors, and not of their absence. Testing can never prove conclusively that a program is correct. No matter how exhaustive the testing, it will always be possible for the system to contain errors which have not been detected.