Unit Testing - Nakov's Talk @ VarnaConf 2013
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Unit Testing - Nakov's Talk @ VarnaConf 2013

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Unit testing - презентацията на Наков на ВарнаКонф 2013 - http://www.varnaconf.com

Unit testing - презентацията на Наков на ВарнаКонф 2013 - http://www.varnaconf.com

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Unit Testing - Nakov's Talk @ VarnaConf 2013 Unit Testing - Nakov's Talk @ VarnaConf 2013 Presentation Transcript

  • UnitTesting Building Rock-Solid Software Svetlin Nakov Telerik Software Academy http://academy.telerik.com ManagerTechnicalTraining http://www.nakov.com
  • What is UnitTesting?
  • UnitTest – 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]
  • UnitTest – 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"); }
  • UnitTesting – 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
  • UnitTesting Frameworks & JUnit
  • 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 – for C# and all .NET languages  cppUnit, jsUnit, PhpUnit, PerlUnit, ...  Visual StudioTeamTest (VSTT)  Developed by Microsoft, integrated inVS 7
  • UnitTesting Frameworks  JUnit – 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 – 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
  • JUnit – 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>
  • JUnit – 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
  • JUnit – 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)
  • JUnit – Assertions (2)  Conditions  assertTrue(condition)  assertFalse(condition)  Forced test fail  fail()  Expecting exception  @Test(expected=IndexOutOfBoundsExcept ion.class)
  •  Java class that needs unit testing: JUnit – 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; } }
  •  JUnit based test class (fixture): JUnit – 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); } }
  •  JUnit text fixture with setup and cleanup: JUnit – 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; } }
  • 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 { }
  • Eclipse and JUnit  Eclipse has built-in support for integration with JUnit  Can create, run and debug JUnit tests
  • Testing with JUnit Live Demo
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