LOG4J2-2850 : LocalizedMessageFactory creates new message with baseName as messagePattern

Added test cases
diff --git a/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageFactoryTest.java b/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageFactoryTest.java
index 1e49a6f..b977a18 100644
--- a/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageFactoryTest.java
+++ b/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageFactoryTest.java
@@ -35,4 +35,12 @@
         final Message message = localizedMessageFactory.newMessage("hello_world");
         assertEquals("Hello world.", message.getFormattedMessage());
     }
+	
+	  @Test
+    public void testNewMessageUsingBaseName() {
+        final LocalizedMessageFactory localizedMessageFactory = new LocalizedMessageFactory("MF");
+		final String testMsg = "hello_world";
+        final Message message = localizedMessageFactory.newMessage(testMsg);
+        assertEquals("Hello world.", message.getFormattedMessage());
+    }
 }
diff --git a/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageTest.java b/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageTest.java
index 019bd69..918e93d 100644
--- a/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageTest.java
+++ b/log4j-api/src/test/java/org/apache/logging/log4j/message/LocalizedMessageTest.java
@@ -90,4 +90,11 @@
         final String actual = msg.getFormattedMessage();
         assertEquals("Test message abc", actual, "Should use initial param value");
     }
+	
+	@Test
+    public void testMessageUsingBaseName() { // LOG4J2-2850
+        final String testMsg = "hello_world";
+        final LocalizedMessage msg = new LocalizedMessage("MF", testMsg, null);
+        assertEquals("Hello world.", msg.getFormattedMessage());
+    }
 }
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 8418044..6264f1b 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -277,6 +277,9 @@
       <action issue="LOG4J2-2954" dev="ckozak" type="fix" due-to="Henry Tung">
         Prevent premature garbage collection of shutdown hooks in DefaultShutdownCallbackRegistry.
       </action>
+	  <action issue="LOG4J2-2850" dev="sandeepbarnwal" type="fix">
+		Fix incorrect constructor call in LocalizedMessageFactory.
+      </action>
     </release>
     <release version="2.13.3" date="2020-05-10" description="GA Release 2.13.3">
       <action issue="LOG4J2-2838" dev="rgoers" type="fix">