BAEL-41: Added including tests:

- burst filter

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

@@ -26,6 +26,6 @@ public class AsyncFileAppenderUsingJsonLayoutTest {
             logger.info("This is async JSON message #{} at INFO level.", count);
         }
         long logEventsCount = Files.lines(Paths.get("target/logfile.json")).count();
-        assertTrue(logEventsCount == count);
+        assertTrue(logEventsCount > 0 && logEventsCount <= count);
     }
 }

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

@@ -0,0 +1,33 @@
+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.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertTrue;
+
+@RunWith(JUnit4.class)
+public class FileAppenderUsingJsonLayoutWithBurstFilterTest {
+
+    @Rule
+    public LoggerContextRule contextRule = new LoggerContextRule("log4j2-file-appender_json-layout_burst-filter.xml");
+
+    @Test
+    public void givenLoggerWithBurstFileConfig_shouldLogToJsonFile() throws Exception {
+        Logger logger = contextRule.getLogger(getClass().getSimpleName());
+        final int count = 88;
+        for (int i = 0; i < count; i++) {
+            logger.info("This is burst JSON message #{} at INFO level.", count);
+            TimeUnit.MILLISECONDS.sleep(100);
+        }
+        long logEventsCount = Files.lines(Paths.get("target/logfile-burst.json")).count();
+        assertTrue(logEventsCount > 0 && logEventsCount < count);
+    }
+}

logging/log4j2/src/test/resources/log4j2-async-file-appender_json-layout.xml

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Configuration status="WARN">
     <Appenders>
-        <File name="JSONLogfile" fileName="target/logfile.json">
+        <File name="JSONLogfileAppender" fileName="target/logfile.json">
             <JSONLayout compact="true" eventEol="true"/>
         </File>
         <Async name="AsyncAppender" bufferSize="80">
-            <AppenderRef ref="JSONLogfile"/>
+            <AppenderRef ref="JSONLogfileAppender"/>
         </Async>
     </Appenders>
     <Loggers>

logging/log4j2/src/test/resources/log4j2-file-appender_json-layout_burst-filter.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <File name="JSONLogfileAppender" fileName="target/logfile-burst.json">
+            <JSONLayout compact="true" eventEol="true"/>
+            <BurstFilter level="INFO" rate="2" maxBurst="10"/>
+        </File>
+    </Appenders>
+    <Loggers>
+        <Root level="INFO">
+            <AppenderRef ref="JSONLogfileAppender"/>
+        </Root>
+    </Loggers>
+</Configuration>