JUnit测试中的SystemOutRule没有捕获标准输出 [英] SystemOutRule in JUnit test didn't capture standard output

问题描述

我想测试 ClientDtoServiceConsoleImpl.displayAllClientsInfo（）方法。它只是将一些数据输出到控制台。

我试图通过

---

displayAllClientsInfo（List< ClientDTO> clients） 大约以下结构：

  for（ClientDTO客户端：客户端） ）{
 System.out.println（client.getName（））; 
列表< AccountDTO> accounts = client.getAccounts（）; 
 for（AccountDTO账户：账户）{
 System.out.println（account.getLogin（））; 
} 
} 
  

---

当我通过 System.setOut（new PrintStream（outputStream））手动更改系统输出，然后用于测试 outputStream.toString（） - 测试效果很好。

---

控制台输出开始：

 客户账户
 ------------------------------- -------------------------------------------------- -------------------------------------------------- --------- 
 id电子邮件名称| id创建登录密码
 ========================================== ================================================== ================================================ 
 1 [e-mail] John Smith | 
 | 10 2017-05-25T12：59 JSmith1 zzwvp0d9 
 | 20 2016-01-05T18：32 JSmith2 mhjnbgfv 
 | 30 2015-11-10T11：29 JSmith3 ytersds1 
 ------------------------------------ -------------------------------------------------- -------------------------------------------------- ---- 
 2 [e-mail] Jack Black | 
 ---------------------------------------------- -------------------------------------------------- -------------------------------------------- 
 
 org.opentest4j.AssertionFailedError：
 at org.junit.jupiter.api.AssertionUtils.fail（AssertionUtils.java:48）
 at org.junit.jupiter.api.AssertTrue.assertTrue（AssertTrue。 java：54）
 at org.junit.jupiter.api.AssertTrue.assertTrue（AssertTrue.java:33）
 at org.junit.jupiter.api.Assertions.assertTrue（Assertions.java:110） 
 at com.example.services.dto.ClientDtoServiceConsoleImplTest.lambda $ displayAllClientsInfo $ 0（ClientDtoServiceConsoleImplTest.java:73）
 at org.junit.jupiter.api.AssertAll.lambda $ assertAll $ 0（AssertAll.java： 57）java.util.Spliterators的
 $ ArraySpliterator.forEachRemaining（Spliterators.java:948）java.util.stream.ReferencePipeline上的
 $ Head.forEach（ReferencePipeline.java:580）
在org.junit.jupiter.api.AssertAll.assertAll（AssertAll.java:55）
 at org.junit。 jupiter.api.AssertAll.assertAll（AssertAll.java:44）
 at org.junit.jupiter.api.AssertAll.assertAll（AssertAll.java:38）
 at org.junit.jupiter.api。 Assertions.assertAll（Assertions.java:1039）
 at com.example.services.dto.ClientDtoServiceConsoleImplTest.displayAllClientsInfo（ClientDtoServiceConsoleImplTest.java:71）
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
 at java.lang.reflect.Method。调用（Method.java:498）
 org.junit.platform.commons.util.ReflectionUtils.invokeMethod（ReflectionUtils.java:389）
 at org.junit.jupiter.engine.execution.ExecutableInvoker。调用（ExecutableInvoker.java:115）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda $ invokeTestMethod $ 6（TestMethodTestDescriptor.java:167）
 at o rg.junit.jupiter.engine.execution.ThrowableCollector.execute（ThrowableCollector.java:40）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod（TestMethodTestDescriptor.java:163）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute（TestMethodTestDescriptor.java:110）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute（TestMethodTestDescriptor.java:57）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:83）
 at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor.java： 66）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $ null $ 2（HierarchicalTestExecutor.java:92）
 at java.util.stream.ForEachOps $ Fo rEachOp $ OfRef.accept（ForEachOps.java:184）
 at java.util.stream.ReferencePipeline $ 2 $ 1.accept（ReferencePipeline.java:175）
 at java.util.Iterator.forEachRemaining（Iterator。 java：116）
 at java.util.Spliterators $ IteratorSpliterator.forEachRemaining（Spliterators.java:1801）
 at java.util.stream.AbstractPipeline.copyInto（AbstractPipeline.java:481)
 at java.util.stream.AbstractPipeline.wrapAndCopyInto（AbstractPipeline.java:471）
 at java.util.stream.ForEachOps $ ForEachOp.evaluateSequential（ForEachOps.java:151)
 at java.util.stream .ForEachOps $ ForEachOp $ OfRef.evaluateSequential（ForEachOps.java:174）
 at java.util.stream.AbstractPipeline.evaluate（AbstractPipeline.java:234）
 at java.util.stream.ReferencePipeline.forEach （ReferencePipeline.java:418）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:92）
 org.junit.platform.engine。 support.hierar chical.SingleTestExecutor.executeSafely（SingleTestExecutor.java:66）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform。 engine.support.hierarchical.HierarchicalTestExecutor.lambda $ null $ 2（HierarchicalTestExecutor.java:92）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.accept（ForEachOps.java:184）
 at java .util.stream.ReferencePipeline $ 2 $ 1.accept（ReferencePipeline.java:175）
 at java.util.Iterator.forEachRemaining（Iterator.java:116) 
 at java.util.Spliterators $ IteratorSpliterator.forEachRemaining （Spliterators.java:1801）
 at java.util.stream.AbstractPipeline.copyInto（AbstractPipeline.java:481）
 at java.util.stream.AbstractPipeline.wrapAndCopyInto（AbstractPipeline.java:471）
 at java.util.stream.ForEachOps $ ForEachOp.evaluateSequential（ForEachOps.java:151）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.evaluateSequential（ForEa chOps.java:174）
 at java.util.stream.AbstractPipeline.evaluate（AbstractPipeline.java:234）
 at java.util.stream.ReferencePipeline.forEach（ReferencePipeline.java:418)
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:92）
 at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor） .java：66）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor .execute（HierarchicalTestExecutor.java:51）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute（HierarchicalTestEngine.java:43）
 at org.junit.platform.launcher.core .DefaultLauncher.execute（DefaultLauncher.java:170）
 at org.junit.platform.launcher.core.DefaultLauncher.execute（DefaultLauncher.java:154） 
 at org.junit.platform.launcher.core.DefaultLauncher.execute（DefaultLauncher.java:90）
 at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs（JUnit5IdeaTestRunner.java:62）
 at com.intellij.rt.execution.junit.IdeaTestRunner $ Repeater.startRunnerWithArgs（IdeaTestRunner.java:47）
 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart（JUnitStarter.java:242)
 at com.intellij.rt.execution.junit.JUnitStarter.main（JUnitStarter.java:70）
 
 
 org.opentest4j.AssertionFailedError：
 at org.junit。 jupiter.api.AssertionUtils.fail（AssertionUtils.java:48）
 at org.junit.jupiter.api.AssertTrue.assertTrue（AssertTrue.java:54）
 at org.junit.jupiter.api。 AssertTrue.assertTrue（AssertTrue.java:33）
 at org.junit.jupiter.api.Assertions.assertTrue（Assertions.java:110）
 at com.example.services.dto.ClientDtoServiceConsoleImplTest.lambda $ displayAllClientsInfo $ 1（ClientDtoServiceConsoleImplTest.java:74）
 at org.junit.jupiter.api.AssertAll.lambda $ assertAll $ 0（AssertAll.java:57）
 at java.util.Spliterators $ ArraySpliterator.forEachRemaining（Spliterators.java:948) 
 at java.util.stream.ReferencePipeline $ Head.forEach（ReferencePipeline.java:580）
 at org.junit.jupiter.api.AssertAll.assertAll（AssertAll.java:55）
 at org.junit .jupiter.api.AssertAll.assertAll（AssertAll.java:44）
 at org.junit.jupiter.api.AssertAll.assertAll（AssertAll.java:38）
 at org.junit.jupiter.api .Assertions.assertAll（Assertions.java:1039）
 at com.example.services.dto.ClientDtoServiceConsoleImplTest.displayAllClientsInfo（ClientDtoServiceConsoleImplTest.java:71）
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） 
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
 at java.lang.reflect.Method .invoke（方法。 java：498）
 at org.junit.platform.commons.util.ReflectionUtils.invokeMethod（ReflectionUtils.java:389）
 at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke（ExecutableInvoker。 java：115）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda $ invokeTestMethod $ 6（TestMethodTestDescriptor.java:167）
 at org.junit.jupiter.engine.execution.ThrowableCollector.execute （ThrowableCollector.java:40）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod（TestMethodTestDescriptor.java:163）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute （TestMethodTestDescriptor.java:110）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute（TestMethodTestDescriptor.java:57）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor .lambda $执行$ 3（HierarchicalTestExecutor.java:83）
 at org.junit.platform.engine.support.hierarchical.Singl eTestExecutor.executeSafely（SingleTestExecutor.java:66）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine。 support.hierarchical.HierarchicalTestExecutor.lambda $ null $ 2（HierarchicalTestExecutor.java:92）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.accept（ForEachOps.java:184）
 at java.util .stream.ReferencePipeline $ 2 $ 1.accept（ReferencePipeline.java:175）
 at java.util.Iterator.forEachRemaining（Iterator.java:116) 
 at java.util.Spliterators $ IteratorSpliterator.forEachRemaining（Spliterators .java：1801）
 at java.util.stream.AbstractPipeline.copyInto（AbstractPipeline.java:481）
 at java.util.stream.AbstractPipeline.wrapAndCopyInto（AbstractPipeline.java:471) 
 at java.util.stream.ForEachOps $ ForEachOp.evaluateSequential（ForEachOps.java:151）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.evaluateSequential（ForEachOps.java:1 74）
 at java.util.stream.AbstractPipeline.evaluate（AbstractPipeline.java:234）
 at java.util.stream.ReferencePipeline.forEach（ReferencePipeline.java:418) 
 at org .junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:92）
 org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor.java:66 ）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $ null $ 2（HierarchicalTestExecutor.java:92）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.accept（ForEachOps.java:184）
 at java.util.stream.ReferencePipeline $ 2 $ 1.accept（ ReferencePipeline.java:175）
 at java.util.Iterator.forEachRemaining（Iterator.java:116）
 at java.util.Spliterators $ IteratorSpliterator.forEachRemaining（Spliterat ors.java:1801)
 at java.util.stream.AbstractPipeline.copyInto（AbstractPipeline.java:481）
 at java.util.stream.AbstractPipeline.wrapAndCopyInto（AbstractPipeline.java:471)
 at java.util.stream.ForEachOps $ ForEachOp.evaluateSequential（ForEachOps.java:151）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.evaluateSequential（ForEachOps.java:174）
 at java.util.stream.AbstractPipeline.evaluate（AbstractPipeline.java:234）
 at java.util.stream.ReferencePipeline.forEach（ReferencePipeline.java:418) 
 at org.junit.platform.engine .support.hierarchical.HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:92）
 at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor.java:66）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecuto r.execute（HierarchicalTestExecutor.java:51）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute（HierarchicalTestEngine.java:43）
 at org.junit.platform.launcher。 core.DefaultLauncher.execute（DefaultLauncher.java:170）
 at org.junit.platform.launcher.core.DefaultLauncher.execute（DefaultLauncher.java:154）
 at org.junit.platform.launcher。 core.DefaultLauncher.execute（DefaultLauncher.java:90）
 at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs（JUnit5IdeaTestRunner.java:62）
 at com.intellij.rt.execution.junit.IdeaTestRunner $ Repeater.startRunnerWithArgs（IdeaTestRunner.java:47）
 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart（JUnitStarter.java:242）
 at com.intellij.rt.execution.junit。 JUnitStarter.main（JUnitStarter.java:70）
 
 
 org.opentest4j.AssertionFailedError：
 at org.junit.jupiter.api.AssertionUtils.fail（AssertionUtils.java:48） ）org的
 .junit.jupiter.api.AssertTrue.assertTrue（AssertTrue.java:54）
 at org.junit.jupiter.api.AssertTrue.assertTrue（AssertTrue.java:33）
 at org.junit.jupiter .api.Assertions.assertTrue（Assertions.java:110）
 at com.example.services.dto.ClientDtoServiceConsoleImplTest.lambda $ displayAllClientsInfo $ 2（ClientDtoServiceConsoleImplTest.java:75）
 at org.junit.jupiter。 api.AssertAll.lambda $ assertAll $ 0（AssertAll.java:57）
 at java.util.Spliterators $ ArraySpliterator.forEachRemaining（Spliterators.java:948) 
 at java.util.stream.ReferencePipeline $ Head .forEach（ReferencePipeline.java:580）
 at org.junit.jupiter.api.AssertAll.assertAll（AssertAll.java:55）
 at org.junit.jupiter.api.AssertAll.assertAll（AssertAll） .java：44）
 at org.junit.jupiter.api.AssertAll.assertAll（AssertAll.java:38）
 at org.junit.jupiter.api.Assertions.assertAll（Assertions.java:1039 ）com.example.services.dto.ClientDtoServiceConsoleImplTest.displayAllClientsI 
 nfo（ClientDtoServiceConsoleImplTest.java:71）
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）
 at sun。 reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
 at java.lang.reflect.Method.invoke（Method.java:498）
 at org.junit.platform.commons.util.ReflectionUtils。 invokeMethod（ReflectionUtils.java:389）
 at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke（ExecutableInvoker.java:115）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor。 lambda $ invokeTestMethod $ 6（TestMethodTestDescriptor.java:167）
 at org.junit.jupiter.engine.execution.ThrowableCollector.execute（ThrowableCollector.java:40）
 at org.junit.jupiter.engine.descriptor .TestMethodTestDescriptor.invokeTestMethod（TestMethodTestDescriptor.java:163）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.e xecute（TestMethodTestDescriptor.java:110）
 at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute（TestMethodTestDescriptor.java:57）
 at org.junit.platform.engine.support.hierarchical。 HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:83）
 at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor.java:66）
 at org.junit.platform .engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $ null $ 2（HierarchicalTestExecutor.java:92）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.accept（ForEachOps.java:184）
 at java.util.stream.ReferencePipeline $ 2 $ 1.accept（ReferencePipeline.java:175)
 at java.util.Iterator.forEachRemaining（Iterator.java:116）java.util.Spliterators的
 $ IteratorSpliterator.forEachRemaining（Spliterators.java:180） 1）
在java.util.stream.AbstractPipeline.copyInto（AbstractPipeline.java:481）
在java.util.stream.AbstractPipeline.wrapAndCopyInto（AbstractPipeline.java:471）
在java .util.stream.ForEachOps $ ForEachOp.evaluateSequential（ForEachOps.java:151）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.evaluateSequential（ForEachOps.java:174）
 at java.util .stream.AbstractPipeline.evaluate（AbstractPipeline.java:234）
 at java.util.stream.ReferencePipeline.forEach（ReferencePipeline.java:418）
 at org.junit.platform.engine.support.hierarchical .HierarchicalTestExecutor.lambda $执行$ 3（HierarchicalTestExecutor.java:92）
 at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor.java:66）
 at org.junit。 platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $ nul l $ 2（HierarchicalTestExecutor.java:92）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.accept（ForEachOps.java:184）
 at java.util.stream.ReferencePipeline $ 2 $ 1.accept （ReferencePipeline.java:175）java.util.Iterator.forEachRemaining的
（Iterator.java:116）java.util.Spliterators的
 $ IteratorSpliterator.forEachRemaining（Spliterators.java:1801）
 at java.util.stream.AbstractPipeline.copyInto（AbstractPipeline.java:481）
 at java.util.stream.AbstractPipeline.wrapAndCopyInto（AbstractPipeline.java:471）
 at java.util.stream。 ForEachOps $ ForEachOp.evaluateSequential（ForEachOps.java:151）
 at java.util.stream.ForEachOps $ ForEachOp $ OfRef.evaluateSequential（ForEachOps.java:174）
 at java.util.stream.AbstractPipeline。评估（AbstractPipeline.java:234）
在java.util.stream.ReferencePipeline.forEach（ReferencePipeline.java:418）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda $执行$ 3（Hierar chicalTestExecutor.java:92）
 at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely（SingleTestExecutor.java:66）
 at org.junit.platform.engine.support.hierarchical。 HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:77）
 at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute（HierarchicalTestExecutor.java:51）
 at org.junit.platform.engine。 support.hierarchical.HierarchicalTestEngine.execute（HierarchicalTestEngine.java:43）
 at org.junit.platform.launcher.core.DefaultLauncher.execute（DefaultLauncher.java:170)
 at org.junit.platform。 launcher.core.DefaultLauncher.execute（DefaultLauncher.java:154）
 at org.junit.platform.launcher.core.DefaultLauncher.execute（DefaultLauncher.java:90）
 at com.intellij.junit5。在com.intellij.rt.execution.junit.IdeaTestRunner $ Repeater.startRunnerWithArgs（Ide aTestRunner.java:47）
 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart（JUnitStarter.java:242）
 at com.intellij.rt.execution.junit.JUnitStarter.main（ JUnitStarter.java:70）
  

解决方案

规则来自JUnit 4个世界。在JUnit 5中（或更准确地说是JUnit Jupiter）静默忽略规则。 您需要分机并使用 ExtendWith 注释测试类或方法。

<$ c $的作者c> SystemOutRule 打算将规则移植到扩展名。

---

更新：

扩展程序由JUnit 5核心提交者。

I want to test ClientDtoServiceConsoleImpl.displayAllClientsInfo() method. It simply prints some data to console.

I tried to capture output in unit test by SystemOutRule, but got empty String output. Why?

package com.example.services.dto;
import com.example.dtos.AccountDTO;
import com.example.dtos.ClientDTO;
import org.junit.Rule;
import org.junit.contrib.java.lang.system.SystemOutRule;
import org.junit.jupiter.api.Test;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertTrue;

class ClientDtoServiceConsoleImplTest {
    @Rule
    public final SystemOutRule systemOutput = new SystemOutRule().enableLog();

    @SuppressWarnings("unchecked")
    @Test
    void displayAllClientsInfo() {
        // Given
        List<ClientDTO> clients = new ArrayList<>();
        clients.add(new ClientDTO(1L, "John Smith", "[e-mail]", Arrays.asList(
                new AccountDTO(10L, 1L, "JSmith1","zzwvp0d9", LocalDateTime.of(2017,5,25,12,59) ),
                new AccountDTO(20L, 1L, "JSmith2","mhjnbgfv", LocalDateTime.of(2016,1,5,18,32) ),
                new AccountDTO(30L, 1L, "JSmith3","ytersds1", LocalDateTime.of(2015,11,10,11,29) )
                )));
        clients.add(new ClientDTO(2L, "Jack Black", "[e-mail]", new ArrayList<>()));
        ClientDtoService clientDtoService = new ClientDtoServiceConsoleImpl();

        // When
        clientDtoService.displayAllClientsInfo(clients);

        // Then
        String output = systemOutput.getLog();
        assertAll(
                // Client
                () -> assertTrue(output.contains(Long.toString(1))),
                () -> assertTrue(output.contains("[e-mail]")),
                () -> assertTrue(output.contains("John Smith")),
                // Accounts
                () -> assertTrue(output.contains(Long.toString(10))),
                () -> assertTrue(output.contains("JSmith1")),
                () -> assertTrue(output.contains("zzwvp0d9")),
                () -> assertTrue(output.contains(LocalDateTime.of(2017,5,25,12,59).toString())),
                () -> assertTrue(output.contains(Long.toString(20))),
                () -> assertTrue(output.contains("JSmith2")),
                () -> assertTrue(output.contains("mhjnbgfv")),
                () -> assertTrue(output.contains(LocalDateTime.of(2016,1,5,18,32).toString())),
                () -> assertTrue(output.contains(Long.toString(30))),
                () -> assertTrue(output.contains("JSmith3")),
                () -> assertTrue(output.contains("ytersds1")),
                () -> assertTrue(output.contains(LocalDateTime.of(2015,11,10,11,29).toString())),
                // Client
                () -> assertTrue(output.contains(Long.toString(2))),
                () -> assertTrue(output.contains("[e-mail]")),
                () -> assertTrue(output.contains("Jack Black"))
        );
    }
}

---

---

displayAllClientsInfo(List<ClientDTO> clients) has approximately the following structure:

for (ClientDTO client : clients) {
    System.out.println(client.getName());
    List<AccountDTO> accounts = client.getAccounts();
    for (AccountDTO account : accounts){
        System.out.println(account.getLogin());
    }
}

---

When I manually change system output by System.setOut(new PrintStream(outputStream)) and then use for testing outputStream.toString() — test works good.

---

Begin of console output:

                        Clients                                                              Accounts                                       
--------------------------------------------------------------------------------------------------------------------------------------------
   id                   e-mail                     name | id                       created                    login                 password
============================================================================================================================================
    1       [e-mail]               John Smith |
                                                        | 10              2017-05-25T12:59                  JSmith1                 zzwvp0d9
                                                        | 20              2016-01-05T18:32                  JSmith2                 mhjnbgfv
                                                        | 30              2015-11-10T11:29                  JSmith3                 ytersds1
--------------------------------------------------------------------------------------------------------------------------------------------
    2         [e-mail]               Jack Black |
--------------------------------------------------------------------------------------------------------------------------------------------

org.opentest4j.AssertionFailedError: 
    at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:48)
    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:54)
    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:33)
    at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:110)
    at com.example.services.dto.ClientDtoServiceConsoleImplTest.lambda$displayAllClientsInfo$0(ClientDtoServiceConsoleImplTest.java:73)
    at org.junit.jupiter.api.AssertAll.lambda$assertAll$0(AssertAll.java:57)
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:55)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:44)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:38)
    at org.junit.jupiter.api.Assertions.assertAll(Assertions.java:1039)
    at com.example.services.dto.ClientDtoServiceConsoleImplTest.displayAllClientsInfo(ClientDtoServiceConsoleImplTest.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)
    at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.Iterator.forEachRemaining(Iterator.java:116)
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.Iterator.forEachRemaining(Iterator.java:116)
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:62)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)


org.opentest4j.AssertionFailedError: 
    at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:48)
    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:54)
    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:33)
    at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:110)
    at com.example.services.dto.ClientDtoServiceConsoleImplTest.lambda$displayAllClientsInfo$1(ClientDtoServiceConsoleImplTest.java:74)
    at org.junit.jupiter.api.AssertAll.lambda$assertAll$0(AssertAll.java:57)
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:55)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:44)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:38)
    at org.junit.jupiter.api.Assertions.assertAll(Assertions.java:1039)
    at com.example.services.dto.ClientDtoServiceConsoleImplTest.displayAllClientsInfo(ClientDtoServiceConsoleImplTest.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)
    at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.Iterator.forEachRemaining(Iterator.java:116)
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.Iterator.forEachRemaining(Iterator.java:116)
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:62)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)


org.opentest4j.AssertionFailedError: 
    at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:48)
    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:54)
    at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:33)
    at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:110)
    at com.example.services.dto.ClientDtoServiceConsoleImplTest.lambda$displayAllClientsInfo$2(ClientDtoServiceConsoleImplTest.java:75)
    at org.junit.jupiter.api.AssertAll.lambda$assertAll$0(AssertAll.java:57)
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:55)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:44)
    at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:38)
    at org.junit.jupiter.api.Assertions.assertAll(Assertions.java:1039)
    at com.example.services.dto.ClientDtoServiceConsoleImplTest.displayAllClientsInfo(ClientDtoServiceConsoleImplTest.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)
    at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.Iterator.forEachRemaining(Iterator.java:116)
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
    at java.util.Iterator.forEachRemaining(Iterator.java:116)
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:62)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

解决方案

Rules are from the JUnit 4 world. In JUnit 5 (or to be more precise JUnit Jupiter) Rules are silently ignored. You need an Extension and annotate the test class or method with ExtendWith.

The author of the SystemOutRule intends to port the rule to an extension.

---

Update:

There is an extension by a JUnit 5 core commiter.

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