Go through each method and add enough documentation to show what the code is doing using JavaDoc comments (i.e /** */).

Code 1

code 2

code 3

code 4

package main; 3 import static org. junit.Assert.* 5 import org. junit.After import org. junit. Before; 7 import org. junit. Test 8 import java. sgl.Connection 9 import java.sql.SQLException; 10 12 public class DbHelperTest 13 private DbHelper helper; 14 15 @Before 16 public void in itHelper() throws SQLException helper DbHelper getInstance( 18 helper init(); 19 20 21 @After 22 public void close Helper() throws SQLException 23 helper. close 24 25 26 27 OTest public void connectionTest 28 try t 29 Connection conn helper. getConnection 30 assertNotNull("could not get database connection", conn); 31 conn. close 32 33 catch (SQLException e) 34 e.printStackTrace(); 35 36 37 38 39 40 41