geode-log4j/src/integrationTest/java/org/apache/geode/logging/log4j/internal/impl/GeodeConsoleAppenderWithSystemOutRuleIntegrationTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
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package org.apache.geode.logging.log4j.internal.impl;

import static org.apache.geode.test.util.ResourceUtils.createFileFromResource;
import static org.apache.geode.test.util.ResourceUtils.getResource;
import static org.assertj.core.api.Assertions.assertThat;

import java.net.URL;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.junit.LoggerContextRule;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.SystemErrRule;
import org.junit.contrib.java.lang.system.SystemOutRule;
import org.junit.experimental.categories.Category;
import org.junit.rules.TemporaryFolder;
import org.junit.rules.TestName;

import org.apache.geode.logging.internal.log4j.api.LogService;
import org.apache.geode.test.junit.categories.LoggingTest;

/**
 * Integration tests for {@link GeodeConsoleAppender} with {@code
 * SystemOutRule} and {@code SystemErrRule}.
 *
 * <p>
 * Verifies that {@code SystemOutRule} can capture the output of {@link
 * GeodeConsoleAppender}. If this behavior changes, then Geode
 * logging tests may also need to change.
 */
@Category(LoggingTest.class)
public class GeodeConsoleAppenderWithSystemOutRuleIntegrationTest {

  private static final String CONFIG_FILE_NAME =
      "GeodeConsoleAppenderWithSystemOutRuleIntegrationTest_log4j2.xml";

  private static String configFilePath;

  private Logger logger;
  private String logMessage;

  @ClassRule
  public static SystemOutRule systemOutRule = new SystemOutRule().enableLog();

  @ClassRule
  public static SystemErrRule systemErrRule = new SystemErrRule().enableLog();

  @ClassRule
  public static TemporaryFolder temporaryFolder = new TemporaryFolder();

  @Rule
  public LoggerContextRule loggerContextRule = new LoggerContextRule(configFilePath);

  @Rule
  public TestName testName = new TestName();

  @BeforeClass
  public static void setUpLogConfigFile() {
    URL resource = getResource(CONFIG_FILE_NAME);
    configFilePath = createFileFromResource(resource, temporaryFolder.getRoot(), CONFIG_FILE_NAME)
        .getAbsolutePath();
  }

  @Before
  public void setUp() {
    systemOutRule.clearLog();
    systemErrRule.clearLog();

    logger = LogService.getLogger();
    logMessage = "Logging in " + testName.getMethodName();
  }

  @Test
  public void staticSystemOutRuleCapturesConsoleAppenderOutput() {
    logger.info(logMessage);

    assertThat(systemOutRule.getLog()).contains(logMessage);
    assertThat(systemErrRule.getLog()).isEmpty();
  }
}