CSE360 Tutorial 11

Introduction to Software Engineering
Software Testing
(202206)

Transcript

1. CSE360
   Introduction to Software Engineering
   Lecture:
   Software Testing
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu
   Office Hours: By appointment
   

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2. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 2
   Announcement
   • Assignment 04 is open and it is due June 30.
   • Quiz 04 will be later this week about Unit Testing
   • The Final Exam is on July 7
   

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3. Software Testing
   Unit Testing
   

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4. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 4
   Next Step
   Process
   Requirements
   Planning
   Modeling
   Coding
   Testing
   

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5. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 5
   Definition
   • Validation. It is about requirements. Are we building
   the right product? Does this software do what it
   needs to do?
   • Verification. It is about design. Are we building the
   product right? Does this meet it requirements?
   • Testing. Examination of the behavior of a program
   by executing it on sample data sets.
   

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6. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 6
   Testing
   Testing
   White Box
   (Verification)
   Unit Testing
   Integration Testing
   Black Box
   (Validation)
   System Testing
   Scenario-based
   testing
   Model-based testing
   

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7. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 7
   Verify, Validate, and Test
   

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8. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 8
   Unit Testing
   • Unit testing is the testing of an individual unit or
   group of related units.
   • It test that a unit is producing expected output
   against given input.
   • Each Unit developer must define Unit Test Cases for
   that Unit.
   • Unit Testing Frameworks are tools and libraries that
   help to implement the Unit Testing process. Example
   JUnit
   

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9. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 9
   Example
   

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10. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 10
    Example
    

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11. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 11
    Limitations and Constraints
    • Missing or Bad requirements
    • Limited time and money
    • Exhaustive testing is not possible
    • Sampling
    

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12. Software Testing
    Test Yourselves
    

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13. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 13
    Coverage
    • Statement Coverage: every statement is executed
    at least 1 time.
    • Decision Coverage: every decision point is
    executed at least 1 time
    • Decision-Condition Coverage: every decision
    tested with all possible outcomes
    

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14. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 14
    Statement Coverage
    1. if (a <10 || b>5)
    2. x = 50
    3. else
    4. x = 0;
    5. if (w == 5 || y>0)
    6. z = 48;
    7. else
    8. z = 5;
    Total Statements?
    Statement Coverage with a = 0, b=0, w=0, y=0 ?
    Statement Coverage with a=10, b=4, w=5, y = anything ?
    Coverage is cumulative
    

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15. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 15
    Decision Coverage
    1. x = 0;
    2. if (x<10)
    3. doSomething();
    4. x =5;
    Total Statements?
    Statement coverage ?
    Decision Coverage ?
    

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16. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 16
    Decision-Condition Coverage
    1. if (x<1 || y>5 a&& z!=0 || flag== T && s==NIL)
    2. doThis();
    3. else
    4. doThat();
    Total Statements?
    Test cases needed for 100% statement coverage?
    Test cases needed for Test for 100% decision coverage?
    Test cases needed for Test for 100% decision-condition
    coverage?
    

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17. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 17
    Test Yourselves
    

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18. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 18
    Test Yourselves
    1. start =1;
    2. end = num;
    3. found = false;
    4. while (starts <= end and not found ) {
    5. middle =(start - end)/2;
    6. if (key > table[middle]) {
    7. start = middle +1
    8. } else if (key = table[middle]) {
    9. found = T
    10. LOC = middle;
    11. } else
    12. end = middle -1;
    13. }
    14. }
    //TestCase1 table={10, 20, 30, 40, 50, 60, 70}, key=55
    //TestCase2 table={10, 20, 30, 40, 50, 60, 70}, key=40
    

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19. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 19
    Reference
    Chapter 8
    

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20. CSE360 – Introduction to Software Engineering
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Summer 2022
    Disclaimer. These slides can only be used as study material for the class CSE360 at ASU. They cannot be distributed or used for another purpose.
    

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