[BAEL-2749] add `SampleDbUnitTest` (extending `DBTestCase`)

dbunit/src/test/java/com/baeldung/dbunit/SampleDbUnitTest.java

@@ -0,0 +1,96 @@
+package com.baeldung.dbunit;
+
+import org.dbunit.Assertion;
+import org.dbunit.DBTestCase;
+import org.dbunit.PropertiesBasedJdbcDatabaseTester;
+import org.dbunit.dataset.IDataSet;
+import org.dbunit.dataset.ITable;
+import org.dbunit.dataset.xml.FlatXmlDataSetBuilder;
+import org.dbunit.operation.DatabaseOperation;
+import org.junit.Test;
+
+import java.io.InputStream;
+import java.sql.Connection;
+import java.sql.ResultSet;
+
+public class SampleDbUnitTest extends DBTestCase {
+    private static final String JDBC_DRIVER = org.h2.Driver.class.getName();
+    private static final String JDBC_URL = "jdbc:h2:mem:default;DB_CLOSE_DELAY=-1;init=runscript from 'classpath:schema.sql'";
+    private static final String USER = "sa";
+    private static final String PASSWORD = "";
+
+    public SampleDbUnitTest(String name) {
+        super(name);
+        System.setProperty(PropertiesBasedJdbcDatabaseTester.DBUNIT_DRIVER_CLASS, JDBC_DRIVER);
+        System.setProperty(PropertiesBasedJdbcDatabaseTester.DBUNIT_CONNECTION_URL, JDBC_URL);
+        System.setProperty(PropertiesBasedJdbcDatabaseTester.DBUNIT_USERNAME, USER);
+        System.setProperty(PropertiesBasedJdbcDatabaseTester.DBUNIT_PASSWORD, PASSWORD);
+        // System.setProperty( PropertiesBasedJdbcDatabaseTester.DBUNIT_SCHEMA, "");
+    }
+
+    @Override
+    protected IDataSet getDataSet() throws Exception {
+        final InputStream is = SampleDbUnitTest.class.getClassLoader().getResourceAsStream("data.xml");
+        return new FlatXmlDataSetBuilder().build(is);
+    }
+
+    @Override
+    protected DatabaseOperation getSetUpOperation() {
+        return DatabaseOperation.REFRESH;
+    }
+
+    @Override
+    protected DatabaseOperation getTearDownOperation() {
+        return DatabaseOperation.NONE;
+    }
+
+    @Test
+    public void testSelect() throws Exception {
+        // Arrange
+        final Connection connection = getConnection().getConnection();
+
+        // Act
+        final ResultSet rs = connection.createStatement().executeQuery("select * from iTEMS where id = 1");
+
+        // Assert
+        assertTrue(rs.next());
+        assertEquals("Grey T-Shirt", rs.getString("title"));
+    }
+
+    @Test
+    public void testDelete() throws Exception {
+        // Arrange
+        final Connection connection = getConnection().getConnection();
+
+        final InputStream is = SampleDbUnitTest.class.getClassLoader().getResourceAsStream("items_exp_delete.xml");
+        ITable expectedTable = (new FlatXmlDataSetBuilder().build(is)).getTable("items");
+
+        // Act
+        connection.createStatement().executeUpdate("delete from ITEMS where id = 2");
+
+        // Assert
+        final IDataSet databaseDataSet = getConnection().createDataSet();
+        ITable actualTable = databaseDataSet.getTable("items");
+
+        Assertion.assertEquals(expectedTable, actualTable);
+    }
+
+    @Test
+    public void testUpdate() throws Exception {
+        // Arrange
+        final Connection connection = getConnection().getConnection();
+
+        final InputStream is = SampleDbUnitTest.class.getClassLoader().getResourceAsStream("items_exp_rename.xml");
+        ITable expectedTable = (new FlatXmlDataSetBuilder().build(is)).getTable("items");
+
+        // Act
+        connection.createStatement().executeUpdate("update ITEMS set title='new name' where id = 1");
+
+        // Assert
+        final IDataSet databaseDataSet = getConnection().createDataSet();
+        ITable actualTable = databaseDataSet.getTable("items");
+
+        Assertion.assertEquals(expectedTable, actualTable);
+    }
+
+}