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Introduction to Eclipse, Unit Testing and JUnit

Introduction to Eclipse, Unit Testing and JUnit. Amit Shabtay. Eclipse. Eclipse is a kind of universal tool platform - an open extensible IDE for anything and nothing in particular. plugins JDT CDT UML Many many more. Working with Eclipse – Live Demonstration. Project Views Code Assist

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Introduction to Eclipse, Unit Testing and JUnit

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  1. Introduction to Eclipse, Unit Testing and JUnit Amit Shabtay

  2. Eclipse • Eclipse is a kind of universal tool platform - an open extensible IDE for anything and nothing in particular. • plugins • JDT • CDT • UML • Many many more Object Oriented Design Course

  3. Working with Eclipse – Live Demonstration • Project • Views • Code Assist • Errors • Debugging • JUnit • UML Object Oriented Design Course

  4. Unit Tests • First level of testing • Done by the programmer • Part of the coding process • Delivered with the code • Part of the build process Object Oriented Design Course

  5. What’s a Unit? • Unit tests should be written in test classes, that replace ‘drivers’ • For example, class Stack • Class Stack Has push, pop, count, … • Class TestStack Has testPush, testPop • Tests are per-functionality • Not per method (testPushNull) • Not per class (testIterators) • Unit testing can have several levels Object Oriented Design Course

  6. What’s a Unit Test? • Call methods, and assert conditions void testPush() { s = new Stack(); s.push(new Integer(10)); assertEquals(s.count() == 1); } • Tests check themselves • Only output if a test fails • Write tests after writing interface • Run all tests after each change Object Oriented Design Course

  7. Running Unit Tests • A main() is required to run tests • There are better options • JUnit for Java • CppUnit for C++ • Unit Testing Frameworks • Graphical user interface • Easily choose which tests to run • Elegantly support for test suites Object Oriented Design Course

  8. Coding with Unit Tests • Part of the design process • Design for testability --> Modularity • Part of the coding process • Test-first coding • Run tests after each build • Part of the build process • Build = compile + link + pass unit tests • A.k.a. “smoke tests” Object Oriented Design Course

  9. Benefits of Unit Tests • Regression Testing • For your own code • Daily build: for others’ work • Part of the usual work • Replaces work done anyway • Causes tests to be written • Validates the design before impl Object Oriented Design Course

  10. Top 12 Reasons to Write Unit Tests Part I • Tests Reduce Bugs in New Features • Tests Reduce Bugs in Existing Features • Tests Are Good Documentation • Tests Reduce the Cost of Change Object Oriented Design Course

  11. Top 12 Reasons to Write Unit Tests Part II • Tests Improve Design • Tests Allow Refactoring • Tests Constrain Features • Tests Defend Against Other Programmers Object Oriented Design Course

  12. Top 12 Reasons to Write Unit Tests Part III • Testing Is Fun • Testing Forces You to Slow Down and Think • Testing Makes Development Faster • Tests Reduce Fear Object Oriented Design Course

  13. JUnit • Unit testing framework for Java • Open Source • Integrated into Eclipse • TestCase • setUp(), tearDown() • Test<TestName>() • TestSuite • TestRunner Object Oriented Design Course

  14. Resources • Eclipse • http://www.eclipse.org/ • http://www.eclipse-plugins.info/ • Top 12 Reasons to Write Unit Tests • http://www.onjava.com/pub/a/onjava/2003/04/02/javaxpckbk.html • JUnit • http://www.junit.org/ Object Oriented Design Course

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