Fix logger subscription cleanup on reconfiguration

lib/src/rohd_bridge_logger.dart

@@ -12,6 +12,7 @@
 
 import 'dart:io';
 import 'package:logging/logging.dart';
+import 'package:meta/meta.dart';
 import 'package:rohd_bridge/rohd_bridge.dart';
 
 /// Extension on [Logger] to throw an exception if an [error] is encountered.
@@ -68,6 +69,13 @@ abstract class RohdBridgeLogger {
     bool continueOnError = false,
     bool enableDebugMesage = false,
   }) {
+    // Clean up existing logger subscriptions and file sink
+    Logger.root.clearListeners();
+    if (fileSink != null) {
+      unawaited(fileSink!.close());
+    }
+    fileSink = null;
+
     RohdBridgeLogger.continueOnError = continueOnError;
     Logger.root.level = rootLevel;
     _printLevel = printLevel;

test/rohd_bridge_logger_test.dart

@@ -0,0 +1,93 @@
+// rohd_bridge_logger_test.dart
+// Tests for ROHD Bridge Logger functionality.
+
+import 'dart:io';
+import 'package:test/test.dart';
+import 'package:logging/logging.dart';
+import 'package:rohd_bridge/src/rohd_bridge_logger.dart';
+
+void main() {
+  group('RohdBridgeLogger', () {
+    late Directory tempDir;
+
+    setUp(() async {
+      tempDir = await Directory.systemTemp.createTemp('rohd_bridge_test');
+    });
+
+    tearDown(() async {
+      await RohdBridgeLogger.terminate();
+      if (tempDir.existsSync()) {
+        tempDir.deleteSync(recursive: true);
+      }
+    });
+
+    test('configureLogger cleans up previous subscriptions', () async {
+      final logFile1 = '${tempDir.path}/test1.log';
+      final logFile2 = '${tempDir.path}/test2.log';
+
+      // Configure logger first time
+      RohdBridgeLogger.configureLogger(logFile1);
+
+      // Log a message
+      RohdBridgeLogger.logger.info('First configuration');
+      await RohdBridgeLogger.flush();
+
+      // Reconfigure logger - this should clean up previous subscriptions
+      RohdBridgeLogger.configureLogger(logFile2);
+
+      // Log another message after reconfiguration
+      RohdBridgeLogger.logger.info('Second configuration');
+      await RohdBridgeLogger.flush();
+
+      // Verify first log file exists and has content from first configuration
+      expect(File(logFile1).existsSync(), isTrue);
+      final firstLogContent = await File(logFile1).readAsString();
+      expect(firstLogContent, contains('First configuration'));
+
+      // Verify second log file exists and has content from second configuration
+      expect(File(logFile2).existsSync(), isTrue);
+      final secondLogContent = await File(logFile2).readAsString();
+      expect(secondLogContent, contains('Second configuration'));
+
+      // Second log should not contain first message (proves no duplicate logging)
+      expect(secondLogContent, isNot(contains('First configuration')));
+
+      // First log should not contain second message (proves cleanup worked)
+      expect(firstLogContent, isNot(contains('Second configuration')));
+    });
+
+    test('configureLogger handles null fileSink gracefully', () {
+      // This should not throw even when fileSink is initially null
+      expect(() => RohdBridgeLogger.configureLogger('${tempDir.path}/test.log'),
+             returnsNormally);
+    });
+
+    test('multiple reconfigurations work correctly', () async {
+      final logFiles = <String>[];
+
+      // Configure logger multiple times
+      for (int i = 0; i < 3; i++) {
+        final logFile = '${tempDir.path}/test$i.log';
+        logFiles.add(logFile);
+
+        RohdBridgeLogger.configureLogger(logFile);
+        RohdBridgeLogger.logger.info('Message $i');
+        await RohdBridgeLogger.flush();
+      }
+
+      // Each log file should exist and contain only its respective message
+      for (int i = 0; i < 3; i++) {
+        expect(File(logFiles[i]).existsSync(), isTrue);
+        final content = await File(logFiles[i]).readAsString();
+        expect(content, contains('Message $i'));
+
+        // Should not contain messages from other configurations
+        for (int j = 0; j < 3; j++) {
+          if (i != j) {
+            expect(content, isNot(contains('Message $j')));
+          }
+        }
+      }
+    });
+  });
+}