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/** * Creates a DbUnit database connection. * @return test database connection */ public static IDatabaseConnection createConnection() throws Exception { Properties properties = new Properties(); properties.load(new FileInputStream(Paths.BASEDIR + "/build.properties")); String String String String driver = properties.getProperty("test.db.driver"); url = properties.getProperty("test.db.url"); user = properties.getProperty("test.db.username"); password = properties.getProperty("test.db.password");
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Class.forName(driver); Connection connection = DriverManager.getConnection(url, user, password); return new DatabaseConnection(connection); } /** * Creates a DbUnit dataset based on an XML file. * @param xmlFile path to an XML file containing the dataset * @return requested dataset */ public static IDataSet createDataSet(String file) throws Exception { return new XmlDataSet(new FileInputStream(Paths.BASEDIR + "/setup/data/dbunit/" + file)); } } To use DbUnit in your tests you interact with the DatabaseOperation class, which provides methods for operations performed against the database. The DbUnitUtils class provides methods to create a connection and create a DbUnit data set. Listing 8-23 shows the usage of the DbUnitUtils class in a TestNG class. In the init method, annotated to execute once before any test method in the test class, the DbUnitUtils class method createConnection is used to get a database connection and to load a dataset. The DatabaseOperation DbUnit class is then used to perform a CLEAN_INSERT operation using the connection and the loaded dataset. DbUnit supports several combinations of operations for inserting, updating, and deleting data from the database using a data set. The CLEAN_INSERT operation deletes all rows from tables in the data set and inserts the data contained in the data set. If you don t want to clear the database before the test but only want to modify the data, use the REFRESH operation, which only performs updates and inserts against the database.
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Listing 8-23. Using DbUnitUtils in a TestNG Test import org.dbunit.operation.DatabaseOperation; public class MyDbTest { @Configuration(beforeTestClass = true) protected void init() { IDatabaseConnection connection = DbUnitUtils.createConnection(); try { DatabaseOperation.CLEAN_INSERT.execute( connection, DbUnitUtils.createDataSet(myDataSet)); } finally { connection.close(); } } ... } Finally, in your test methods DbUnit can also be used to compare changes to the database. Listing 8-24 shows an example of what the DbUnit code will look like for comparing the state of the database after a database insert of a record into a table with a database-generated primary key. DbUnit is used to verify that the insert is successful by comparing the contents of the database with an XML data set file named AfterDataSubmitted.xml, using the DbUnit Assertion class. Listing 8-24. A Typical DbUnit/TestNG Test import import import import import org.dbunit.Assertion; org.dbunit.database.IDatabaseConnection; org.dbunit.dataset.IDataSet; org.dbunit.dataset.ITable; org.dbunit.operation.DatabaseOperation;
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public class MyDbTest { ... @Test(groups = {"db"}) public void testCreateData() { // do something that causes a SQL insert ... // compare contents of database // ignore primary key since it is auto generated IDatabaseConnection connection = DatabaseConnectionFactory.createConnection();
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// load the contents of the table, since we want to ignore the PK it is not // part of the select statement ITable actualTable = connection .createQueryTable("MYTABLE", "select COLUMN1,COLUMN2, from MYTABLE"); // load the expected data set from the XML DbUnit file IDataSet expectedDataSet = DatabaseConnectionFactory .createDataSet("AfterDataSubmitted.xml"); // create a virtual table out of the loaded data for the comparison ITable expectedTable = expectedDataSet.getTable("MYTABLE"); // using the DbUnit Assertion class compare the tables Assertion.assertEquals(expectedTable, actualTable); } ... }
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Testing the DTO layer implemented with DynaDTO in 5 becomes very simple with TestNG. Listing 8-25 shows a TestNG class with two methods. In the setUp method the DynaDTO configuration is loaded using the DynaDTO ConfigurationLoader class. In the testNewsItemCreation method a News domain object is created, and then, using the DynaDTO Builder, a dynamic DTO is created. The rest of the method uses the TestNG Assert class to compare every field of the domain object against the DTO. (In this case the DTO is a mirror image of the domain object.) Listing 8-25. A TestNG Test for a DynaDTO DTO package com.integrallis.techconf.dto; import java.io.File; import java.util.Date; import import import import import import import org.dynadto.Builder; org.dynadto.BuilderFactory; org.dynadto.ConfigurationLoader; org.dynadto.exception.ConfigurationException; org.testng.Assert; org.testng.annotations.Configuration; org.testng.annotations.Test;
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import com.integrallis.techconf.domain.News; import com.integrallis.techconf.test.util.Paths;
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