我开始发现Mockito库,但有一个问题我没有找到正确的答案。
例如,如果我在UserDAO类中有这样的方法,可以将用户保存在数据库中:
public class UserDAO{
...
public void create(User user) {
Connection connection = null;
PreparedStatement pstmt = null;
ResultSet generatedKeys = null;
try {
connection = getConnection();
pstmt = connection.prepareStatement(INSERT_USER,
PreparedStatement.RETURN_GENERATED_KEYS);
int counter = 1;
pstmt.setString(counter++, user.getFirstName());
pstmt.setString(counter++, user.getLastName());
pstmt.setString(counter++, user.getEmail());
pstmt.setString(counter++, user.getPassword());
pstmt.setString(counter++, user.getRole());
pstmt.setString(counter, user.getLang());
pstmt.execute();
connection.commit();
generatedKeys = pstmt.getGeneratedKeys();
if (generatedKeys.next()) {
user.setId(generatedKeys.getInt(Fields.GENERATED_KEY));
}
} catch (SQLException e) {
rollback(connection);
LOG.error("Can not create a user", e);
} finally {
close(connection);
close(pstmt);
close(generatedKeys);
}
}
....
}
我应该如何测试它?
例如,如果我想测试一个DAO类,那么我需要创建一个DataSource
模拟,Connection
模拟,ResultSet
模拟等等?所以不测试数据库本身吗?
但是,如果我还想测试dao和数据库的行为,该怎么办?
你能提供一些代码样本,链接,这些可能是有帮助的,并展示做这件事的最佳方法吗?
发布于 2015-02-08 12:11:13
这是使用Mockito测试UserDAO的一个很好的开始。这段代码使用了大量的Mockito特性,因此您可以了解如何使用它们。如果你有什么问题,请告诉我。
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.junit.Assert.*;
import org.junit.runner.RunWith;
import static org.mockito.Matchers.anyInt;
import static org.mockito.Matchers.anyString;
import org.mockito.Mock;
import static org.mockito.Mockito.doNothing;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import org.mockito.runners.MockitoJUnitRunner;
@RunWith(MockitoJUnitRunner.class)
public class TestUserDAO {
@Mock
DataSource mockDataSource;
@Mock
Connection mockConn;
@Mock
PreparedStatement mockPreparedStmnt;
@Mock
ResultSet mockResultSet;
int userId = 100;
public TestUserDAO() {
}
@BeforeClass
public static void setUpClass() throws Exception {
}
@AfterClass
public static void tearDownClass() {
}
@Before
public void setUp() throws SQLException {
when(mockDataSource.getConnection()).thenReturn(mockConn);
when(mockDataSource.getConnection(anyString(), anyString())).thenReturn(mockConn);
doNothing().when(mockConn).commit();
when(mockConn.prepareStatement(anyString(), anyInt())).thenReturn(mockPreparedStmnt);
doNothing().when(mockPreparedStmnt).setString(anyInt(), anyString());
when(mockPreparedStmnt.execute()).thenReturn(Boolean.TRUE);
when(mockPreparedStmnt.getGeneratedKeys()).thenReturn(mockResultSet);
when(mockResultSet.next()).thenReturn(Boolean.TRUE, Boolean.FALSE);
when(mockResultSet.getInt(Fields.GENERATED_KEYS)).thenReturn(userId);
}
@After
public void tearDown() {
}
@Test
public void testCreateWithNoExceptions() throws SQLException {
UserDAO instance = new UserDAO(mockDataSource);
instance.create(new User());
//verify and assert
verify(mockConn, times(1)).prepareStatement(anyString(), anyInt());
verify(mockPreparedStmnt, times(6)).setString(anyInt(), anyString());
verify(mockPreparedStmnt, times(1)).execute();
verify(mockConn, times(1)).commit();
verify(mockResultSet, times(2)).next();
verify(mockResultSet, times(1)).getInt(Fields.GENERATED_KEYS);
}
@Test(expected = SQLException.class)
public void testCreateWithPreparedStmntException() throws SQLException {
//mock
when(mockConn.prepareStatement(anyString(), anyInt())).thenThrow(new SQLException());
try {
UserDAO instance = new UserDAO(mockDataSource);
instance.create(new User());
} catch (SQLException se) {
//verify and assert
verify(mockConn, times(1)).prepareStatement(anyString(), anyInt());
verify(mockPreparedStmnt, times(0)).setString(anyInt(), anyString());
verify(mockPreparedStmnt, times(0)).execute();
verify(mockConn, times(0)).commit();
verify(mockResultSet, times(0)).next();
verify(mockResultSet, times(0)).getInt(Fields.GENERATED_KEYS);
throw se;
}
}
}
发布于 2015-02-08 06:47:31
结合使用JUnit和DBUnit这样的工具可以帮助您使用数据库测试DAO。DBUnit帮助您在UnitTest之前将测试数据插入数据库,并在测试后将数据库中的数据与您的预期进行比较。
https://stackoverflow.com/questions/28388204
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