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Testing Web Applications with HtmlUnit and Dbunit

Learn about Java APIs HtmlUnit and Dbunit for automated functional testing of web and database applications, benefits, designing tests, and more.

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Testing Web Applications with HtmlUnit and Dbunit

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  1. Testing Web Applications with HtmlUnit and Dbunit Michael J. Bresnahan Fruition Consulting Inc.

  2. Agenda • About Me, Mike Bresnahan • Brief Overview of HtmlUnit and Dbunit • Benefits of Automated Testing • About HtmlUnit • About Dbunit • Designing Tests • Questions and Answers

  3. About Me, Mike Bresnahan • 9 years of software development experience • Enterprise applications • C, C++, Java • Relational Databases • Client/Server • Web • 1 year of HtmlUnit and Dbunit experience

  4. A Brief Overview of HtmlUnit and Dbunit • Both are Java APIs for automated functional testing. • HtmlUnit is a Java API for automated testing of web applications. • Dbunit is a JUnit extension for automated testing of database applications. • Both are Java API’s, but can be used to test applications written in any language. • Both are Open Source.

  5. Benefits of Automated Testing • More efficient than manual testing. • Less error prone than manual testing. • Enables collective code ownership. • Enables refactoring. • Enables frequent integration.

  6. About HtmlUnit HtmlUnit Test Client Web Server Application Server

  7. HtmlUnit Features • HTTP 1.0 and 1.1 • HTTPS • HTML 4 • Cookies • Proxy Servers • JavaScript • Simulated Mouse Clicks • DOM Search and Navigation

  8. Simple HtmlUnit Test 1 publicclassSimpleHtmlUnitTestextendsjunit.framework.TestCase{ 2 3 publicvoidtestHomePage()throwsException{ 4 WebClientwebClient=newWebClient(); 5 java.net.URLurl=new 6 java.net.URL("http://htmlunit.sourceforge.net"); 7 8 HtmlPagepage=(HtmlPage)webClient.getPage(url); 9 10 assertEquals("Welcome to HtmlUnit",page.getTitleText()); 11 } 12 }

  9. HTML Form Test 1 publicclassFormTestextendsjunit.framework.TestCase{ 2 3 publicvoidtestForm()throwsException{ 4 WebClientwebClient=newWebClient(); 5 java.net.URLurl= 6 newjava.net.URL("http://htmlunit.sourceforge.net"); 7 8 HtmlPagepage=(HtmlPage)webClient.getPage(url); 9 10 HtmlFormform=page.getFormByName("myform"); 11 12 HtmlTextInputtextInput= 13 (HtmlTextInput)form.getInputByName("myfield"); 14 15 textInput.setValueAttribute("zappa zoo yeah!"); 16 17 form.submit(); 18 } 19 }

  10. Button Click Test 1 publicclassButtonClickTestextendsjunit.framework.TestCase{ 2 3 publicvoidtestButtonClick()throwsException{ 4 WebClientwebClient=newWebClient(); 5 java.net.URLurl= 6 newjava.net.URL("http://htmlunit.sourceforge.net"); 7 8 HtmlPagepage=(HtmlPage)webClient.getPage(url); 9 10 HtmlFormform=page.getFormByName("myform"); 11 12 HtmlButtonInputbuttonInput= 13 (HtmlButtonInput)form.getInputByName("mybutton"); 14 15 HtmlPagenewPage=(HtmlPage)buttonInput.click(); 16 } 17 }

  11. About Dbunit XML Database

  12. Dbunit Features • DTD database schemas • Import/export XML datasets • Manipulate datasets • Compare datasets • Ant task

  13. Abstract Database Test 1 public abstract classAbstractDatabaseTestCase 2 extendsorg.dbunit.DatabaseTestCase{ 3 4 protectedIDatabaseConnectiongetConnection()throwsException{ 5 java.sql.Connectionconnection= java.sql.DriverManager. 6 getConnection("jdbc:oracle:thin:@localhost:1521:foo"); 7 returnnewDatabaseConnection(connection); 8 } 9 10 protectedDatabaseOperationgetSetUpOperation()throwsException{ 11 returnDatabaseOperation.CLEAN_INSERT; 12 } 13 14 protectedIDataSetgetDataSet()throwsException{ 15 returnnewFlatXmlDataSet(newjava.io.File("dataset.xml")); 16 } 17 }

  14. Dataset.xml <!DOCTYPE dataset SYSTEM "dataset.dtd"> <dataset> <STUDY_SESSIONS ID="1" AIMR_AREAS_ID="1" STUDY_SESSION_CODE="1“/> <STUDY_SESSIONS ID="2" AIMR_AREAS_ID="1" STUDY_SESSION_CODE="2“/> <READINGS ID="1" STUDY_SESSIONS_ID="1" READING_CODE="1"/> <READINGS ID="2" STUDY_SESSIONS_ID="2" READING_CODE="2"/> </dataset>

  15. Simple Dbunit Test 1 publicvoidtest()throwsException{ 2 3 // exercise the application 4 5 IDataSetexpectedDataSet= 6 newFlatXmlDataSet(newjava.io.File("expected.xml")); 7 8 ITableexpectedTable=expectedDataSet.getTable(“readings"); 9 10 ITabledatabaseTable=getConnection(). 11 createQueryTable(“readings","select * from readings"); 12 13 Assertion.assertEquals(expectedTable,databaseTable); 14 }

  16. Designing Tests • Keep tests independent • Keep tests small and single purpose • Pool database connections • Load common reference data once • Engineer the test suite • Decouple tests from the application as much as possible • Use Dbunit to hold the expected data of web pages

  17. Further Reading • http://htmlunit.sf.net • http://dbunit.sf.net • http://junit.org

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