如何使用会话豆进行 Mockito 单元测试

Question

我正在学习为我的JSF项目编写一个UnitTest，该项目具有ManangedBeans和Session Beans

我在从 Mockito 测试调用 EJB 时遇到问题

package Test;
import ejb.CountrySession;
import java.io.Serializable;
import javax.ejb.EJB;
import javax.inject.Named;
import javax.faces.view.ViewScoped;
@Named(value = "countryMB")
@ViewScoped
public class CountryMB implements Serializable {
@EJB
private CountrySession countSession;
//
private String countryName;
//
private StatusMsg msg;
public CountryMB() {
}
public void setMsg(StatusMsg msg) {
    this.msg = msg;
}
public void setCountSession(CountrySession countSession) {
    this.countSession = countSession;
}
public String getCountryName() {
    return countryName;
}
public void setCountryName(String countryName) {
    this.countryName = countryName;
}
public void ajaxAll() {
}
public void saveCountry() {
    if (countryName != null && !countryName.trim().isEmpty()) {
        boolean chk = countSession.chkCountry(countryName);
        if (!chk) {
            chk = countSession.addCountry(countryName);
            if (chk) {
                msg.addInfo("Add Country", "New Country added");
            } else {
                msg.addError("Add Country", "Unable to add Country");
            }
        } else {
            msg.addWarn("Add Country", "Country already exists");
        }
    } else {
        msg.addWarn("Add Country", "Required parameter not available");
    }
}
}

现在在我的测试代码中，我有以下内容

package Test;
import ejb.CountrySession;
import entities.Country;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
public class CountryMBTest {
@Mock
private CountryMB countryMB;
@Mock
private StatusMsg sm;
@Mock
private CountrySession countSession;
@Mock
private EntityManager em;
@Mock
private Query qry;
@Before
public void setup() {
    MockitoAnnotations.initMocks(this);
    countryMB = new CountryMB();
    countryMB.setMsg(sm);
    countryMB.setCountSession(countSession);
}
@After
public void after() {
    countryMB = null;
}
@Test
public void infoCountrySave() {
    countryMB.setCountryName("Test");
    countryMB.saveCountry();
    verify(sm).addInfo("Add Country", "New Country added");
}
@Test
public void errorCountrySave() {
    countryMB.setCountryName("Test");
    countryMB.saveCountry();
    verify(sm).addError("Add Country", "Unable to add Country");
}
@Test
public void warnCountrySave() {
    countryMB.setCountryName("Test");
    countryMB.saveCountry();
    verify(sm).addWarn("Add Country", "Country already exists");
}
@Test
public void chkCountSave() {
    List<Country> countLst = null;
    Country dum = mock(Country.class);
    EntityManager em = mock(EntityManager.class);
    Mockito.when(em.find(Country.class, 111)).thenReturn(dum);
    CountrySession cs = Mockito.mock(CountrySession.class);
    Mockito.when(cs.chkCountry("Test")).thenCallRealMethod();
    Mockito.when(cs.getEm()).thenReturn(em);
    String name = "Test";
    Assert.assertNull(cs.chkCountry(name));
}
}

我的表只有一个记录 pk=1，国家=测试

上面的测试代码从不检查会话 bean，它只是抛出

java.lang.NullPointerException
at ejb.CountrySession.chkCountry(CountrySession.java:67)
at Test.CountryMBTest.chkCountSave(CountryMBTest.java:112)

对于 infoCountrySave（） 和 warnCountrySave（），它从不检查数据库中提供的值。

由于我以前从未使用过任何 UnitTest，所以我真的不知道我正在做的事情是否正确，而且我无法通过谷歌搜索找出任何工作代码。

如果有人可以指导我访问一些在线可用的资源，甚至让我知道我需要更正什么才能获得上述 ejb 部分的模拟测试工作，这将非常有帮助。

Answer 1

用 @InjectMocks 更改@Mock

private CountryMB countryMB 

当你得到java.lang.NullPointerException.大多数情况下，您错过了注入某些类或某些依赖项的调用when