![UnitTest ¨C Definition
A unit test is a piece of code written by
a developer that exercises a very small,
specific area of functionality of the code
being tested.
¡°Program testing can be used to show the
presence of bugs, but never to show their
absence!¡±
Edsger Dijkstra, [1972]](https://image.slidesharecdn.com/unit-testing-nakov-varna-conf-2013-130722021643-phpapp02/85/Unit-testing-by-Svetlin-Nakov-3-320.jpg)
![UnitTest ¨C Example
int sum(int[] array) {
int sum = 0;
for (int i=0; i<array.length; i++)
sum += array[i];
return sum;
}
void testSum() {
if (sum(new int[]{1,2}) != 3)
throw new TestFailedException("1+2 != 3");
if (sum(new int[]{-2}) != -2)
throw new TestFailedException("-2 != -2");
if (sum(new int[]{}) != 0)
throw new TestFailedException("0 != 0");
}](https://image.slidesharecdn.com/unit-testing-nakov-varna-conf-2013-130722021643-phpapp02/85/Unit-testing-by-Svetlin-Nakov-4-320.jpg)
![JUnit ¨C Assertions
? Using org.junit.Assert class
? Assertions check a condition and throw exception if
the condition is not satisfied
? Comparing values
? assertEquals ([message], expected value,
calculated value)
? Comparing objects
? assertNull([message], object)
? assertNotNull([message], object)
? assertSame ([message], expected obj,
calculated obj)](https://image.slidesharecdn.com/unit-testing-nakov-varna-conf-2013-130722021643-phpapp02/85/Unit-testing-by-Svetlin-Nakov-11-320.jpg)
![? Java class that needs unit testing:
JUnit ¨C Example
public class Sumator {
public int sum(int a, int b) {
int sum = a + b;
return sum;
}
public int sum(int... nums) {
int sum = 0;
for (int i = 0; i < nums; i++)
sum += nums[i];
return sum;
}
}](https://image.slidesharecdn.com/unit-testing-nakov-varna-conf-2013-130722021643-phpapp02/85/Unit-testing-by-Svetlin-Nakov-13-320.jpg)
![? JUnit based test class (fixture):
JUnit ¨C Example
import org.junit.Test;
import static org.junit.Assert.*;
public class SumatorTest {
@Test
public void testSum() {
Sumator sumator = new Sumator();
int sum = sumator.sum(new int[] {2,3,4});
assertEquals(sum, 9);
}
}](https://image.slidesharecdn.com/unit-testing-nakov-varna-conf-2013-130722021643-phpapp02/85/Unit-testing-by-Svetlin-Nakov-14-320.jpg)
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Unit testing by Svetlin Nakov
- 1. UnitTesting Building Rock-Solid Software Svetlin Nakov Telerik Software Academy http://academy.telerik.com ManagerTechnicalTraining http://www.nakov.com
- 3. UnitTest ¨C Definition A unit test is a piece of code written by a developer that exercises a very small, specific area of functionality of the code being tested. ¡°Program testing can be used to show the presence of bugs, but never to show their absence!¡± Edsger Dijkstra, [1972]
- 4. UnitTest ¨C Example int sum(int[] array) { int sum = 0; for (int i=0; i<array.length; i++) sum += array[i]; return sum; } void testSum() { if (sum(new int[]{1,2}) != 3) throw new TestFailedException("1+2 != 3"); if (sum(new int[]{-2}) != -2) throw new TestFailedException("-2 != -2"); if (sum(new int[]{}) != 0) throw new TestFailedException("0 != 0"); }
- 5. UnitTesting ¨C Some Facts ? Tests are pieces of code (small programs) ? In most cases unit tests are written by developers, not by QA engineers ? Unit tests are released into the code repository (TFS / SVN / Git) along with the code they test ? Unit testing framework is needed ? Visual StudioTeamTest (VSTT) ? NUnit, MbUnit, Gallio, etc. 5
- 7. UnitTesting Frameworks ? JUnit ? The first popular unit testing framework ? Based on Java, written by Kent Beck & Co. ? Similar frameworks have been developed for a broad range of computer languages ? NUnit ¨C for C# and all .NET languages ? cppUnit, jsUnit, PhpUnit, PerlUnit, ... ? Visual StudioTeamTest (VSTT) ? Developed by Microsoft, integrated inVS 7
- 8. UnitTesting Frameworks ? JUnit ¨C the first unit testing framework ? www.junit.org ? Based on Java ? Developed by Erich Gamma and Kent Beck ? Unit testing frameworks have been developed for a broad range of computer languages ? NUnit ¨C for C#,VB.NET and .NET languages ? cppUnit, DUnit, jsUnit, PhpUnit, PerlUnit, ... ? List of xUnit frameworks can be found at: http://www.testingfaqs.org/t-unit.html
- 9. JUnit ¨C Features ? Test code is annotated using Java 5 annotations ? Test code contains assertions ? Tests are grouped in test fixtures and test suites ? Several execution interfaces ? Eclipse integrated plug-in ? Console interface: java org.junit.runner.JUnitCore <test-class>
- 10. JUnit ¨C Annotations ? @Test ? Annotates a test case method ? @Before, @After ? Annotates methods called before/after each test case ? @BeforeClass, @AfterClass ? Annotates methods called one time before and after all test cases in the class ? @Ignore ? Ignores a test case 10
- 11. JUnit ¨C Assertions ? Using org.junit.Assert class ? Assertions check a condition and throw exception if the condition is not satisfied ? Comparing values ? assertEquals ([message], expected value, calculated value) ? Comparing objects ? assertNull([message], object) ? assertNotNull([message], object) ? assertSame ([message], expected obj, calculated obj)
- 12. JUnit ¨C Assertions (2) ? Conditions ? assertTrue(condition) ? assertFalse(condition) ? Forced test fail ? fail() ? Expecting exception ? @Test(expected=IndexOutOfBoundsExcept ion.class)
- 13. ? Java class that needs unit testing: JUnit ¨C Example public class Sumator { public int sum(int a, int b) { int sum = a + b; return sum; } public int sum(int... nums) { int sum = 0; for (int i = 0; i < nums; i++) sum += nums[i]; return sum; } }
- 14. ? JUnit based test class (fixture): JUnit ¨C Example import org.junit.Test; import static org.junit.Assert.*; public class SumatorTest { @Test public void testSum() { Sumator sumator = new Sumator(); int sum = sumator.sum(new int[] {2,3,4}); assertEquals(sum, 9); } }
- 15. ? JUnit text fixture with setup and cleanup: JUnit ¨C Example public class SumatorTest { private Sumator sumator; @Before public void setUpTestCase() { this.sumator = new Sumator(); } @Test public void testSum() { int sum = sumator.sum(2, 3); assertEquals(sum, 5); } @After public void cleanUpTestCase() { this.sumator = null; } }
- 16. Test Suites ? Suits are sets of JUnit test classes ? We can define test suits with annotations: import org.junit.runner.RunWith; import org.junit.runners.Suite; import org.junit.runners.Suite.SuiteClasses; @RunWith(value=Suite.class) @SuiteClasses(value={Test1.class, Test2.class}) public class AllTests { }
- 17. Eclipse and JUnit ? Eclipse has built-in support for integration with JUnit ? Can create, run and debug JUnit tests
- 18. Testing with JUnit Live Demo
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