Integrate logging system into Flutter app with service registration and testing setup

finlog_app/fluttery/test/fluttery_test.dart

@@ -1,12 +1,37 @@
-import 'package:flutter_test/flutter_test.dart';
-
 import 'package:fluttery/fluttery.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fluttery/logger/logger.dart';
+import 'package:fluttery/src/logger/logger_impl.dart';
+import 'package:kiwi/kiwi.dart';
+
+import 'mocks/mocks.dart';
 
 void main() {
-  test('adds one to input values', () {
-    final calculator = Calculator();
-    expect(calculator.addOne(2), 3);
-    expect(calculator.addOne(-7), -6);
-    expect(calculator.addOne(0), 1);
+  group('App Service Tests', () {
+    // Clear the singleton state before each test to ensure isolation
+    setUp(() {
+      // KiwiContainer provides a clear method to remove all registered services
+      KiwiContainer().clear();
+    });
+
+    test('should register and resolve a custom service', () {
+      // Register a mock logger service
+      final mockLogger = MockLogger();
+      App.registerService<Logger>(() => mockLogger);
+
+      // Resolve the service and check if it's the same instance
+      final resolvedLogger = App.service<Logger>();
+      expect(resolvedLogger, isA<MockLogger>());
+      expect(resolvedLogger, same(mockLogger));
+    });
+
+    test('should register and resolve default services', () {
+      // Register default services
+      App.registerDefaultServices();
+
+      // Resolve the Logger service and check if it's an instance of LoggerImpl
+      final logger = App.service<Logger>();
+      expect(logger, isA<LoggerImpl>());
+    });
   });
 }

finlog_app/fluttery/test/logger/logger_test.dart

@@ -0,0 +1,69 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:logging/logging.dart' as lib;
+import 'package:fluttery/src/logger/logger_impl.dart';
+
+// Mock class for the lib.Logger
+class MockLibLogger extends Mock implements lib.Logger {}
+
+void main() {
+  final mockLibLogger = MockLibLogger();
+
+  group('LoggerImpl', () {
+    late LoggerImpl loggerImpl;
+
+    setUp(() {
+      loggerImpl = LoggerImpl.forTest(mockLibLogger);
+    });
+
+    test('info method logs an info message', () {
+      loggerImpl.info('Info message');
+
+      // Verify that the info method was called on the mock logger with the correct message
+      verify(() => mockLibLogger.info('Info message')).called(1);
+    });
+
+    test('warning method logs a warning message', () {
+      loggerImpl.warning('Warning message');
+
+      // Verify that the warning method was called on the mock logger with the correct message
+      verify(() => mockLibLogger.warning('Warning message')).called(1);
+    });
+
+    test('error method logs an error message with optional parameters', () {
+      final exception = Exception('Test exception');
+      final stackTrace = StackTrace.current;
+
+      loggerImpl.error('Error message', exception, stackTrace);
+
+      // Verify that the severe method was called on the mock logger with the correct parameters
+      verify(
+        () => mockLibLogger.severe('Error message', exception, stackTrace),
+      ).called(1);
+    });
+
+    test('debug method logs a debug message', () {
+      loggerImpl.debug('Debug message');
+
+      // Verify that the fine method was called on the mock logger with the correct message
+      verify(() => mockLibLogger.fine('Debug message')).called(1);
+    });
+
+    test('setLogLevel method sets the logger level', () {
+      // This is to capture the change in the logger level
+      var capturedLevel = lib.Level.INFO;
+
+      // Capture the setter call
+      when(() => mockLibLogger.level = any()).thenAnswer((invocation) {
+        capturedLevel = invocation.positionalArguments.first as lib.Level;
+        return capturedLevel;
+      });
+
+      // Set the log level
+      loggerImpl.setLogLevel(lib.Level.WARNING);
+
+      // Verify that the logger level is set to the expected level
+      expect(capturedLevel, lib.Level.WARNING);
+    });
+  });
+}

finlog_app/fluttery/test/mocks/mocks.dart

@@ -0,0 +1,4 @@
+import 'package:fluttery/logger/logger.dart';
+import 'package:mocktail/mocktail.dart';
+
+class MockLogger extends Mock implements Logger {}