使用JUnit测试内部类中的案例

Question

我读到了结构化单元测试,每个类都有一个测试类,每个方法都有一个内部类.想象一下,这似乎是一种组织测试的方便方法,所以我在Java项目中尝试过.但是,内部类中的测试似乎根本没有被接受.

我大致这样做了:

public class DogTests
{
    public class BarkTests
    {
        @Test
        public void quietBark_IsAtLeastAudible() { }

        @Test
        public void loudBark_ScaresAveragePerson() { }
    }

    public class EatTests
    {
        @Test
        public void normalFood_IsEaten() { }

        @Test
        public void badFood_ThrowsFit() { }
    }
}

JUnit不支持这个,还是我做错了？

Answer 1

您应该使用@RunWith(Enclosed.class),并像其他人所说的那样,将内部类声明为静态:

@RunWith(Enclosed.class)
public class DogTests
  {
  public static class BarkTests
  {
    @Test
    public void quietBark_IsAtLeastAudible() { }

    @Test
    public void loudBark_ScaresAveragePerson() { }
  }

  public static class EatTests
  {
    @Test
    public void normalFood_IsEaten() { }

    @Test
    public void badFood_ThrowsFit() { }
  }
}

Answer 2

public class ServicesTest extends TestBase {

   public static class TestLogon{

       @Test
       public void testLogonRequest() throws Exception {
         //My Test Code
       }
   }
}

使内部类静态适用于我.

Answer 3

我认为一些答案可能适用于旧版本的JUnit.在JUnit 4中,这对我有用:

@RunWith(DogTests.class)
@SuiteClasses({ DogTests.BarkTests.class, DogTests.EatTests.class })
public class DogTests extends Suite
{
    public DogTests(Class<?> klass, RunnerBuilder builder) throws InitializationError {
        super(klass, builder);
    }

    public static class BarkTests
    {
        @Test
        public void quietBark_IsAtLeastAudible() { }

        @Test
        public void loudBark_ScaresAveragePerson() { }
    }

    public static class EatTests
    {
        @Test
        public void normalFood_IsEaten() { }

        @Test
        public void badFood_ThrowsFit() { }
    }
}

Answer 4

在JUnit 5中,您只需将非静态内部类标记为@Nested:

import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;

public class DogTests {
    @Nested
    public class BarkTests {
        @Test
        public void quietBark_IsAtLeastAudible() { }

        @Test
        public void loudBark_ScaresAveragePerson() { }
    }

    @Nested
    public class EatTests {
        @Test
        public void normalFood_IsEaten() { }

        @Test
        public void badFood_ThrowsFit() { }
    }
}

Answer 5

我在Nitor Creation的Nested Runner中也取得了成功.

如何使用Nitor Creation的嵌套运行器

有一篇文章在这里解释:

添加此依赖项:

<dependency>
    <groupId>com.nitorcreations</groupId>
    <artifactId>junit-runners</artifactId>
    <version>1.2</version>
    <scope>test</scope>
</dependency>

和@RunWith您的测试:

import com.nitorcreations.junit.runners.NestedRunner
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import static org.junit.Assert.*;

@RunWith(NestedRunner.class)
public class RepositoryUserServiceTest {

    public class RegisterNewUserAccount {

        public class WhenUserUsesSocialSignIn {

            public class WhenUserAccountIsFoundWithEmailAddress {

                @Test
                public void shouldThrowException() {
                     assertTrue(true);
                }
            }

        }
    }
}

PS:示例代码已经从上面的博客文章中获取和修改