BAEL-41: Added including tests:

- rolling file appender using XML layout
- async file appender using JSON layout

logging/log4j2/pom.xml

@@ -31,6 +31,13 @@
             <version>2.8.2</version>
         </dependency>
 
+        <!-- This is used by XMLLayout. -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>2.8.2</version>
+        </dependency>
+
         <!-- This is used for testing only. -->
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>

logging/log4j2/src/test/java/com/baeldung/logging/log4j2/tests/AsyncFileAppenderUsingJsonLayoutTest.java

@@ -1,19 +1,14 @@
 package com.baeldung.logging.log4j2.tests;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.logging.log4j.Logger;
-import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.junit.LoggerContextRule;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
-import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.util.List;
-import java.util.stream.Collectors;
 
 import static org.junit.Assert.assertTrue;
 
@@ -21,7 +16,7 @@ import static org.junit.Assert.assertTrue;
 public class AsyncFileAppenderUsingJsonLayoutTest {
 
     @Rule
-    public LoggerContextRule contextRule = new LoggerContextRule("log4j2-async-file-appender_json-layout_colored.xml");
+    public LoggerContextRule contextRule = new LoggerContextRule("log4j2-async-file-appender_json-layout.xml");
 
     @Test
     public void givenLoggerWithAsyncConfig_shouldLogToJsonFile() throws Exception {
@@ -30,16 +25,7 @@ public class AsyncFileAppenderUsingJsonLayoutTest {
         for (int i = 0; i < count; i++) {
             logger.info("This is async JSON message #{} at INFO level.", count);
         }
-        ObjectMapper objectMapper = new ObjectMapper();
-        List<LogEvent> logEvents = Files.readAllLines(Paths.get("target/logfile.json")).stream()
-          .map(s -> {
-              try {
-                  return objectMapper.readValue(s.getBytes(), LogEvent.class);
-              } catch (IOException e) {
-                  throw new RuntimeException("Failed to import LogEvent!", e);
-              }
-          })
-          .collect(Collectors.toList());
-        assertTrue(logEvents.size() <= count);
+        long logEventsCount = Files.lines(Paths.get("target/logfile.json")).count();
+        assertTrue(logEventsCount == count);
     }
 }

logging/log4j2/src/test/java/com/baeldung/logging/log4j2/tests/RollingFileAppenderUsingXMLLayoutTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.logging.log4j2.tests;
+
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.junit.LoggerContextRule;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.stream.Collectors;
+
+import static org.junit.Assert.assertTrue;
+
+@RunWith(JUnit4.class)
+public class RollingFileAppenderUsingXMLLayoutTest {
+
+    @Rule
+    public LoggerContextRule contextRule = new LoggerContextRule("log4j2-rolling-file-appender_xml-layout.xml");
+
+    @Test
+    public void givenLoggerWithRollingFileConfig_shouldLogToXMLFile() throws Exception {
+        Logger logger = contextRule.getLogger(getClass().getSimpleName());
+        final int count = 88;
+        for (int i = 0; i < count; i++) {
+            logger.info("This is rolling file XML message #{} at INFO level.", count);
+        }
+        String[] logEvents = Files.readAllLines(Paths.get("target/logfile.xml")).stream()
+          .collect(Collectors.joining(System.lineSeparator()))
+          .split("\\n\\n+");
+        assertTrue(logEvents.length == count);
+    }
+}

logging/log4j2/src/test/resources/log4j2-rolling-file-appender_xml-layout.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <RollingFile name="XMLLogfile" fileName="target/logfile.xml"
+                     filePattern="target/logfile-%d{yyyy-MM-dd}-%i.log.gz">
+            <XMLLayout/>
+            <Policies>
+                <SizeBasedTriggeringPolicy size="256 kB"/>
+            </Policies>
+        </RollingFile>
+    </Appenders>
+    <Loggers>
+        <Root level="trace">
+            <AppenderRef ref="XMLLogfile"/>
+        </Root>
+    </Loggers>
+</Configuration>