add unit test

Author: oliver-zhang

instrumentation/log4j/log4j-appender-1.2/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/log4j/appender/v1_2/LogEventMapper.java

@@ -129,7 +129,7 @@ public void capture(
       if (!lineNumber.equals("?")) {
         try {
           codeLineNo = Integer.parseInt(lineNumber);
-        }catch (NumberFormatException e) {
+        } catch (NumberFormatException e) {
           // ignore
         }
       }

instrumentation/log4j/log4j-appender-1.2/javaagent/src/test/java/io/opentelemetry/instrumentation/log4j/appender/v1_2/Log4j1Test.java

@@ -106,6 +106,7 @@ public void test(boolean logException, boolean withParent) throws InterruptedExc
     test(Logger::error, Logger::error, logException, withParent, "abc", Severity.ERROR, "ERROR");
     testing.clearData();
   }
+
   private static void test(
       LoggerMethod loggerMethod,
       ExceptionLoggerMethod exceptionLoggerMethod,