How to use ErrorCollector class of org.assertj.core.api package

Best Assertj code snippet using org.assertj.core.api.ErrorCollector

Source: SimpleControllerIntegrationTest.java

1package com.stackify.slf4j.guide.controllers;2import static org.powermock.api.mockito.PowerMockito.doNothing;3import static org.powermock.api.mockito.PowerMockito.spy;4import java.util.Collections;5import org.apache.log4j.Level;6import org.apache.log4j.spi.LoggingEvent;7import org.assertj.core.api.Condition;8import org.assertj.core.api.SoftAssertions;9import org.junit.Before;10import org.junit.Test;11import org.junit.runner.RunWith;12import org.powermock.core.classloader.annotations.PrepareForTest;13import org.powermock.modules.junit4.PowerMockRunner;14import org.slf4j.MDC;15import com.stackify.slf4j.guide.utils.ListAppender;16@RunWith(PowerMockRunner.class)17@PrepareForTest(MDC.class)18public class SimpleControllerIntegrationTest {19    private SimpleController controller = new SimpleController();20    @Before21    public void clearLogList() {22        ListAppender.clearEventList();23    }24    @Test25    public void whenSimpleRequestMade_thenAllRegularMessagesLogged() {26        String output = controller.processList(Collections.emptyList());27        SoftAssertions errorCollector = new SoftAssertions();28        errorCollector.assertThat(ListAppender.getEvents())29            .haveAtLeastOne(eventContains("Client requested process the following list: []", Level.INFO))30            .haveAtLeastOne(eventContains("Starting process", Level.DEBUG))31            .haveAtLeastOne(eventContains("Finished processing", Level.INFO))32            .haveExactly(0, eventOfLevel(Level.ERROR));33        errorCollector.assertThat(output)34            .isEqualTo("done");35        errorCollector.assertAll();36    }37    @Test38    public void givenClientId_whenMDCRequestMade_thenMessagesWithClientIdLogged() throws Exception {39        // We avoid cleaning the context so tht we can check it afterwards40        spy(MDC.class);41        doNothing().when(MDC.class);42        MDC.clear();43        String clientId = "id-1234";44        String output = controller.clientMDCRequest(clientId);45        SoftAssertions errorCollector = new SoftAssertions();46        errorCollector.assertThat(ListAppender.getEvents())47            .allMatch(entry -> {48                return clientId.equals(entry.getMDC("clientId"));49            })50            .haveAtLeastOne(eventContains("Client id-1234 has made a request", Level.INFO))51            .haveAtLeastOne(eventContains("Starting request", Level.INFO))52            .haveAtLeastOne(eventContains("Finished request", Level.INFO));53        errorCollector.assertThat(output)54            .isEqualTo("finished");55        errorCollector.assertAll();56    }57    private Condition<LoggingEvent> eventOfLevel(Level level) {58        return eventContains(null, level);59    }60    private Condition<LoggingEvent> eventContains(String substring, Level level) {61        return new Condition<LoggingEvent>(entry -> (substring == null || (entry.getRenderedMessage() != null && entry.getRenderedMessage()62            .contains(substring))) && (level == null || level.equals(entry.getLevel())), String.format("entry with message '%s', level %s", substring, level));63    }64}...

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