Add test for logger name

Author: 0xced

tests/Log4NetTextFormatterTest.LoggerName.approved.xml

@@ -0,0 +1,3 @@
+<log4net:event logger="Namespace.Component.Class" timestamp="2003-01-04T15:09:26.535+01:00" level="INFO" xmlns:log4net="http://logging.apache.org/log4net/schemas/log4net-events-1.2/">
+  <log4net:message><![CDATA[Hello from Serilog]]></log4net:message>
+</log4net:event>

tests/Log4NetTextFormatterTest.cs

@@ -7,6 +7,7 @@
 using ApprovalTests.Namers;
 using ApprovalTests.Reporters;
 using FluentAssertions;
+using Serilog.Core;
 using Serilog.Enrichers;
 using Serilog.Events;
 using Serilog.Parsing;
@@ -227,6 +228,21 @@ public void NullProperty()
             Approvals.VerifyWithExtension(output.ToString(), "xml");
         }
 
+        [Fact]
+        public void LoggerName()
+        {
+            // Arrange
+            using var output = new StringWriter();
+            var logEvent = CreateLogEvent(properties: new LogEventProperty(Constants.SourceContextPropertyName, new ScalarValue("Namespace.Component.Class")));
+            var formatter = new Log4NetTextFormatter();
+
+            // Act
+            formatter.Format(logEvent, output);
+
+            // Assert
+            Approvals.VerifyWithExtension(output.ToString(), "xml");
+        }
+
         [Fact]
         public void DefaultFormatProvider()
         {