Unit testing involves writing code to test individual units or components of a software to ensure they operate as intended. JUnit is a popular tool for performing unit tests in Java. It allows writing test cases as Java classes and methods, and running them to validate the code under test. Eclipse IDE facilitates creating and running JUnit test cases directly from the Java code being tested.

1. Manajemen dan Kualitas Perangkat Lunak
IKP321
Unit Testing

2. Unit
 Perangkat Lunak
 Code
 Documentation
 Procedure
 Data
 Satuan terkecil Code
 Unit
 Method atau Function atau Procedure

3. Unit Test
 a piece of code
 written by a developer
 executes a specific functionality in the code under test
 Unit tests ensure
 that code is working as intended
 and validate that this is still the case after code changes.
 Menguji apakah Unit sudah berfungsi sebagaimana yang
diharapkan (as expected)
 Menguji Unit secara independen, tanpa bergantung pada
hasil komputasi Unit lain

4. Rehat Sejenak: JUnit
 Package untuk menjalankan Unit Testing di Java
 Dapat diunduh dari
 https://github.com/KentBeck/junit/downloads
 Jar file
 junit-4.10.jar
 Simpan di folder tertentu
 C:jarfilesjunit-4.10.jar
 /usr/share/java/junit-4.10.jar
 Update CLASSPATH environment variable
 Set CLASSPATH=.;C:jarfilesjunit-4.10.jar
 Export CLASSPATH=.:/usr/share/java/junit-4.10.jar

5. Deklarasi Class Test Case
import junit.framework.*;
public class MaxThreeTest extends TestCase {
public MaxThreeTest(String name) {
super(name);
}
@Test public void testSimple() {
assertEquals(9, MaxThree.largest(7, 8, 9));
}
}

6. Kompilasi Class Test Case
 CLASSPATH sudah diset
 javac MaxThreeTest.java
 CLASSPATH belum diset
 javac -cp /usr/share/java/junit-4.10.jar
MaxThreeTest.java
 javac -cp C:jarfilesjunit-4.10.jar MaxThreeTest.java
 Jalankan Test Case
 java junit.textui.TestRunner MaxThreeTest
 java junit.swingui.TestRunner MaxThreeTest
 java org.junit.runner.JUnitCore MaxThreeTest

7. Kompilasi Class Test Case
.E
Time: 0.043
There was 1 error:
1) testSimple(MaxThreeTest)java.lang.NoClassDefFoundError: MaxThree
at MaxThreeTest.testSimple(MaxThreeTest.java:13)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl
.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcce
ssorImpl.java:25)
Caused by: java.lang.ClassNotFoundException: MaxThree
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 16 more
FAILURES!!!
Tests run: 1, Failures: 0, Errors: 1

8. Implementasi Class
public class MaxThree {
/**
* Return the largest element from 3 integers.
*
* @param a,b,c Three integers
* @return The largest number between inputs.
*/
public static int largest(int a, int b, int c) {
int max;

9. Implementasi Class
if (a >= b) {
max = a;
} else {
max = b;
}
if (c >= max) {
max = c;
}
return max;
}
}

10. ●Jalankan Test Case
 java junit.textui.TestRunner MaxThreeTest
 java junit.swingui.TestRunner MaxThreeTest
 java org.junit.runner.JUnitCore MaxThreeTest
 Hasil
JUnit version 4.10
.
Time: 0.005
OK (1 test)

11. JUnit dan Eclipse
 Eclipse IDE for Java
Developers
 http://www.eclipse.org/
downloads/
 Unduh, Pasang, dan
Jalankan
 Buat Java Project yang
baru

12. JUnit dan Eclipse

13. JUnit dan Eclipse
 Klik-kanan src, pilih New,
pilih Class
 Tuliskan nama class
 MyClass

14. JUnit dan Eclipse

15. JUnit dan Eclipse
 Klik-kanan pada Class
yang baru dibuat
 Pilih New, pilih Junit Test
Case
 Pilih opsi "New JUnit 4
test"
 Ubah nama folder ke
folder "test"

16. JUnit dan Eclipse
 Pilih nama method yang
perlu dibuat Test Case-
nya

17. JUnit dan Eclipse
 Tambahkan class JUnit ke
dalam path Project

18. JUnit dan Eclipse

19. JUnit dan Eclipse
 Klik-kanan pada Class
Test Case,
 Pilih Run As,
 Pilih JUnit test

20. JUnit dan Eclipse

21. Pustaka
 http://www.vogella.de/articles/JUnit/article.html
 starship.python.net/~tbryan/UnitTestTalk/index.html
 tjerdastangkas.blogspot.com/search/label/ikp321