Log4JInstrumentationTest.java 文件源码

@Test
public void testLoggerReconfiguration() throws Exception {
  logger.setLevel(Level.ERROR);

  Map<String, Long> expectedCounts = getCurrentCounts();
  expectedCounts.compute("total", (s, aLong) -> aLong + 1);
  expectedCounts.compute("error", (s, aLong) -> aLong + 1);

  Properties properties = new Properties();
  properties.setProperty("log4j.rootCategory", "INFO,TestLog");
  properties.setProperty("log4j.appender.TestLog", "org.apache.log4j.ConsoleAppender");
  properties.setProperty("log4j.appender.TestLog.layout", "org.apache.log4j.PatternLayout");
  PropertyConfigurator.configure(properties);

  logger.error("error!");
  assertEquals(expectedCounts, getCurrentCounts());

}