Junit in Action proposes some example scenarios to apply Unit Testing with the JUnit 4.x Framework

1. JUNIT IN ACTION
Software Engineering (Exercise) Class
Valerio Maggio, Ph.D. Candidate
valerio.maggio@unina.it
Prof.Adriano Peron
May, 31st 2013

5. JUNIT WORDS CLOUD
a.k.a. some random words (almost) related to JUnit
UnitTesting
JavaTesting
Black BoxTesting
Testing framework
xUnit
Test Suite
Test Fixtures
Test RunnersSimpleTest Program
Testing Automation

6. TEST FIXTURES
SetUp testXXX tearDown
fixture: The set of common resources or
data that you need to run one or more
tests.
@Before @After@Test

7. EXERCISE 1
Calculator

8. CALCULATOR CLASS
• Requirements:
• Input numbers cannot have
more than 5 digits;
• The calculator can remember
a given (unique) number;
• Only non-negative numbers
are allowed.
• In case of negative numbers,
an exception is thrown!
Calculator
+ add (double augend, double addend): double
+ subtract (double minuend, double subtrahend): double
+ multiply (double multiplicand, double multiplier): double
+ divide (double dividend, double divisor): double
+ addToMemory(double number): void
+ recallNumber(): double
- memory: double
+ MAX_DIGITS_LEN: int = 5 <<final>> <<static>>

9. Calculator
+ add (double augend, double addend): double
+ subtract (double minuend, double subtrahend): double
+ multiply (double multiplicand, double multiplier): double
+ divide (double dividend, double divisor): double
+ addToMemory(double number): void
+ recallNumber(): double
+ parseExpression(String expression): double
- memory: double
+ MAX_DIGITS_LEN: int = 5 <<final>> <<static>>
• Add method parseExpression to
the Calculator class and
corresponding bunch of tests!
• The method takes in input an
expression string
• (e.g., 1+2-3*4/2)
• and returns the correct output
result!
• (i.e., -3)

10. EXERCISE 1I
Stack

11. STACK: LIFO QUEUE
Stack
<<constructor>>
+ Stack(capacity: int)
+ pop(): Process
+ push(Process p): void
Process
+ getName():String
+ setName(String n): void
+getPid(): Integer
+ setPid(Integer pid): void
+getPriority():Integer
+setPriority(Integer p): void
- name: String
- pid: Integer
- priority: Integer (default=-1)
*1
_list

12. + enqueue(Process p):void
+ dequeue():Process
<<abstract>>
Queue
*1
_list
Process
FIFOQueue LIFOQueue PriorityQueue
+ addProcess(Process p, Queue q):void
+ schedule(Queue q):Process
Scheduler
1 *
_queues
Q: How would you test Scheduler? Remember: Unit tests run in isolation!