diff --git a/cherrypick/README.md b/cherrypick/README.md
index a4499cb..160ab6b 100644
--- a/cherrypick/README.md
+++ b/cherrypick/README.md
@@ -30,7 +30,7 @@ Binding<String>().toProvide(() => "hello world");
 // Asynchronous lazy initialization
 Binding<String>().toProvideAsync(() async => "hello async world");
 
-/ Asynchronous lazy initialization with dynamic parameters
+// Asynchronous lazy initialization with dynamic parameters
 Binding<String>().toProvideAsyncWithParams((params) async => "hello $params");
 
 // Initialization with dynamic parameters
diff --git a/cherrypick/lib/src/binding.dart b/cherrypick/lib/src/binding.dart
index be00592..fe248c5 100644
--- a/cherrypick/lib/src/binding.dart
+++ b/cherrypick/lib/src/binding.dart
@@ -13,6 +13,8 @@
 
 enum Mode { simple, instance, providerInstance, providerInstanceWithParams }
 
+typedef Provider<T> = T? Function();
+
 typedef ProviderWithParams<T> = T Function(dynamic params);
 
 typedef AsyncProvider<T> = Future<T> Function();
@@ -27,11 +29,13 @@ class Binding<T> {
   late Type _key;
   late String _name;
   T? _instance;
-  T? Function()? _provider;
+  Future<T>? _instanceAsync;
+  Provider<T>? _provider;
+  ProviderWithParams<T>? _providerWithParams;
+
   AsyncProvider<T>? asyncProvider;
   AsyncProviderWithParams<T>? asyncProviderWithParams;
 
-  ProviderWithParams<T>? _providerWithParams;
   late bool _isSingleton = false;
   late bool _isNamed = false;
 
@@ -91,11 +95,22 @@ class Binding<T> {
     return this;
   }
 
+  /// RU: Инициализация экземляпяра [value].
+  /// ENG: Initialization instance [value].
+  ///
+  /// return [Binding]
+  Binding<T> toInstanceAsync(Future<T> value) {
+    _mode = Mode.instance;
+    _instanceAsync = value;
+    _isSingleton = true;
+    return this;
+  }
+
   /// RU: Инициализация экземляпяра  через провайдер [value].
   /// ENG: Initialization instance via provider [value].
   ///
   /// return [Binding]
-  Binding<T> toProvide(T Function() value) {
+  Binding<T> toProvide(Provider<T> value) {
     _mode = Mode.providerInstance;
     _provider = value;
     return this;
@@ -146,6 +161,12 @@ class Binding<T> {
   /// return [T]
   T? get instance => _instance;
 
+  /// RU: Поиск экземпляра.
+  /// ENG: Resolve instance.
+  ///
+  /// return [T]
+  Future<T>? get instanceAsync => _instanceAsync;
+
   /// RU: Поиск экземпляра.
   /// ENG: Resolve instance.
   ///
diff --git a/cherrypick/lib/src/scope.dart b/cherrypick/lib/src/scope.dart
index f0ac55d..cfc9ee1 100644
--- a/cherrypick/lib/src/scope.dart
+++ b/cherrypick/lib/src/scope.dart
@@ -160,11 +160,18 @@ class Scope {
           if (binding.key == T &&
               ((!binding.isNamed && named == null) ||
                   (binding.isNamed && named == binding.name))) {
+            if (binding.instanceAsync != null) {
+              return await binding.instanceAsync;
+            }
+
             if (binding.asyncProvider != null) {
               return await binding.asyncProvider?.call();
             }
 
             if (binding.asyncProviderWithParams != null) {
+              if (params == null) {
+                throw StateError('Param is null. Maybe you forget pass it');
+              }
               return await binding.asyncProviderWithParams!(params);
             }
           }
diff --git a/cherrypick/test/src/binding_test.dart b/cherrypick/test/src/binding_test.dart
index 9f69647..4d3ce11 100644
--- a/cherrypick/test/src/binding_test.dart
+++ b/cherrypick/test/src/binding_test.dart
@@ -2,314 +2,270 @@ import 'package:cherrypick/src/binding.dart';
 import 'package:test/test.dart';
 
 void main() {
-  group('Check instance.', () {
-    group('Without name.', () {
-      test('Binding resolves null', () {
+  // --- Instance binding (synchronous) ---
+  group('Instance Binding (toInstance)', () {
+    group('Without name', () {
+      test('Returns null by default', () {
         final binding = Binding<int>();
         expect(binding.instance, null);
       });
 
-      test('Binding check mode', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toInstance(expectedValue);
-
+      test('Sets mode to instance', () {
+        final binding = Binding<int>().toInstance(5);
         expect(binding.mode, Mode.instance);
       });
 
-      test('Binding check singleton', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toInstance(expectedValue);
-
+      test('isSingleton is true', () {
+        final binding = Binding<int>().toInstance(5);
         expect(binding.isSingleton, true);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toInstance(expectedValue);
-
-        expect(binding.instance, expectedValue);
-      });
-
-      test('Binding resolves value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toInstance(expectedValue);
-        expect(binding.instance, expectedValue);
+      test('Stores value', () {
+        final binding = Binding<int>().toInstance(5);
+        expect(binding.instance, 5);
       });
     });
 
-    group('With name.', () {
-      test('Binding resolves null', () {
-        final binding = Binding<int>().withName('expectedValue');
+    group('With name', () {
+      test('Returns null by default', () {
+        final binding = Binding<int>().withName('n');
         expect(binding.instance, null);
       });
 
-      test('Binding check mode', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().withName('expectedValue').toInstance(expectedValue);
-
+      test('Sets mode to instance', () {
+        final binding = Binding<int>().withName('n').toInstance(5);
         expect(binding.mode, Mode.instance);
       });
 
-      test('Binding check key', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().withName('expectedValue').toInstance(expectedValue);
-
+      test('Sets key', () {
+        final binding = Binding<int>().withName('n').toInstance(5);
         expect(binding.key, int);
       });
 
-      test('Binding check singleton', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().withName('expectedValue').toInstance(expectedValue);
-
+      test('isSingleton is true', () {
+        final binding = Binding<int>().withName('n').toInstance(5);
         expect(binding.isSingleton, true);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().withName('expectedValue').toInstance(expectedValue);
-
-        expect(binding.instance, expectedValue);
+      test('Stores value', () {
+        final binding = Binding<int>().withName('n').toInstance(5);
+        expect(binding.instance, 5);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().withName('expectedValue').toInstance(expectedValue);
-
-        expect(binding.name, 'expectedValue');
+      test('Sets name', () {
+        final binding = Binding<int>().withName('n').toInstance(5);
+        expect(binding.name, 'n');
       });
+    });
 
-      test('Binding resolves value', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().withName('expectedValue').toInstance(expectedValue);
-        expect(binding.instance, expectedValue);
-      });
+    test('Multiple toInstance calls change value', () {
+      final binding = Binding<int>().toInstance(1).toInstance(2);
+      expect(binding.instance, 2);
     });
   });
 
-  group('Check provide.', () {
-    group('Without name.', () {
-      test('Binding resolves null', () {
+  // --- Instance binding (asynchronous) ---
+  group('Async Instance Binding (toInstanceAsync)', () {
+    test('Resolves instanceAsync with expected value', () async {
+      final binding = Binding<int>().toInstanceAsync(Future.value(42));
+      expect(await binding.instanceAsync, 42);
+    });
+
+    test('Does not affect instance', () {
+      final binding = Binding<int>().toInstanceAsync(Future.value(5));
+      expect(binding.instance, null);
+    });
+
+    test('Sets mode to instance', () {
+      final binding = Binding<int>().toInstanceAsync(Future.value(5));
+      expect(binding.mode, Mode.instance);
+    });
+
+    test('isSingleton is true after toInstanceAsync', () {
+      final binding = Binding<int>().toInstanceAsync(Future.value(5));
+      expect(binding.isSingleton, isTrue);
+    });
+
+    test('Composes with withName', () async {
+      final binding = Binding<int>()
+          .withName('asyncValue')
+          .toInstanceAsync(Future.value(7));
+      expect(binding.isNamed, isTrue);
+      expect(binding.name, 'asyncValue');
+      expect(await binding.instanceAsync, 7);
+    });
+
+    test('Keeps value after multiple awaits', () async {
+      final binding = Binding<int>().toInstanceAsync(Future.value(123));
+      final result1 = await binding.instanceAsync;
+      final result2 = await binding.instanceAsync;
+      expect(result1, equals(result2));
+    });
+  });
+
+  // --- Provider binding (synchronous) ---
+  group('Provider Binding (toProvide)', () {
+    group('Without name', () {
+      test('Returns null by default', () {
         final binding = Binding<int>();
         expect(binding.provider, null);
       });
 
-      test('Binding check mode', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toProvide(() => expectedValue);
-
+      test('Sets mode to providerInstance', () {
+        final binding = Binding<int>().toProvide(() => 5);
         expect(binding.mode, Mode.providerInstance);
       });
 
-      test('Binding check singleton', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toProvide(() => expectedValue);
-
+      test('isSingleton is false by default', () {
+        final binding = Binding<int>().toProvide(() => 5);
         expect(binding.isSingleton, false);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toProvide(() => expectedValue);
-
-        expect(binding.provider, expectedValue);
-      });
-
-      test('Binding resolves value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>().toProvide(() => expectedValue);
-        expect(binding.provider, expectedValue);
+      test('Returns provided value', () {
+        final binding = Binding<int>().toProvide(() => 5);
+        expect(binding.provider, 5);
       });
     });
 
-    group('With name.', () {
-      test('Binding resolves null', () {
-        final binding = Binding<int>().withName('expectedValue');
+    group('With name', () {
+      test('Returns null by default', () {
+        final binding = Binding<int>().withName('n');
         expect(binding.provider, null);
       });
 
-      test('Binding check mode', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue);
-
+      test('Sets mode to providerInstance', () {
+        final binding = Binding<int>().withName('n').toProvide(() => 5);
         expect(binding.mode, Mode.providerInstance);
       });
 
-      test('Binding check key', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue);
-
+      test('Sets key', () {
+        final binding = Binding<int>().withName('n').toProvide(() => 5);
         expect(binding.key, int);
       });
 
-      test('Binding check singleton', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue);
-
+      test('isSingleton is false by default', () {
+        final binding = Binding<int>().withName('n').toProvide(() => 5);
         expect(binding.isSingleton, false);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue);
-
-        expect(binding.provider, expectedValue);
+      test('Returns provided value', () {
+        final binding = Binding<int>().withName('n').toProvide(() => 5);
+        expect(binding.provider, 5);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue);
-
-        expect(binding.name, 'expectedValue');
-      });
-
-      test('Binding resolves value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue);
-        expect(binding.provider, expectedValue);
+      test('Sets name', () {
+        final binding = Binding<int>().withName('n').toProvide(() => 5);
+        expect(binding.name, 'n');
       });
     });
   });
 
-  group('Check Async provider.', () {
-    test('Binding resolves value asynchronously', () async {
-      final expectedValue = 5;
-      final binding = Binding<int>().toProvideAsync(() async => expectedValue);
-
-      final result = await binding.asyncProvider?.call();
-      expect(result, expectedValue);
+  // --- Async provider binding ---
+  group('Async Provider Binding', () {
+    test('Resolves asyncProvider value', () async {
+      final binding = Binding<int>().toProvideAsync(() async => 5);
+      expect(await binding.asyncProvider?.call(), 5);
     });
 
-    test('Binding resolves value asynchronously with params', () async {
-      final expectedValue = 5;
-      final binding = Binding<int>().toProvideAsyncWithParams(
-          (param) async => expectedValue + (param as int));
-
-      final result = await binding.asyncProviderWithParams?.call(3);
-      expect(result, expectedValue + 3);
+    test('Resolves asyncProviderWithParams value', () async {
+      final binding = Binding<int>()
+          .toProvideAsyncWithParams((param) async => 5 + (param as int));
+      expect(await binding.asyncProviderWithParams?.call(3), 8);
     });
   });
 
-  group('Check singleton provide.', () {
-    group('Without name.', () {
-      test('Binding resolves null', () {
+  // --- Singleton provider binding ---
+  group('Singleton Provider Binding', () {
+    group('Without name', () {
+      test('Returns null if no provider set', () {
         final binding = Binding<int>().singleton();
         expect(binding.provider, null);
       });
 
-      test('Binding check mode', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().toProvide(() => expectedValue).singleton();
-
+      test('Sets mode to providerInstance', () {
+        final binding = Binding<int>().toProvide(() => 5).singleton();
         expect(binding.mode, Mode.providerInstance);
       });
 
-      test('Binding check singleton', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().toProvide(() => expectedValue).singleton();
-
+      test('isSingleton is true', () {
+        final binding = Binding<int>().toProvide(() => 5).singleton();
         expect(binding.isSingleton, true);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().toProvide(() => expectedValue).singleton();
-
-        expect(binding.provider, expectedValue);
+      test('Returns singleton value', () {
+        final binding = Binding<int>().toProvide(() => 5).singleton();
+        expect(binding.provider, 5);
       });
 
-      test('Binding resolves value', () {
-        final expectedValue = 5;
-        final binding =
-            Binding<int>().toProvide(() => expectedValue).singleton();
-        expect(binding.provider, expectedValue);
+      test('Returns same value each call and provider only called once', () {
+        int counter = 0;
+        final binding = Binding<int>().toProvide(() {
+          counter++;
+          return counter;
+        }).singleton();
+
+        final first = binding.provider;
+        final second = binding.provider;
+        expect(first, equals(second));
+        expect(counter, 1);
       });
     });
 
-    group('With name.', () {
-      test('Binding resolves null', () {
-        final binding = Binding<int>().withName('expectedValue').singleton();
+    group('With name', () {
+      test('Returns null if no provider set', () {
+        final binding = Binding<int>().withName('n').singleton();
         expect(binding.provider, null);
       });
 
-      test('Binding check mode', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue)
-            .singleton();
-
+      test('Sets mode to providerInstance', () {
+        final binding =
+            Binding<int>().withName('n').toProvide(() => 5).singleton();
         expect(binding.mode, Mode.providerInstance);
       });
 
-      test('Binding check key', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue)
-            .singleton();
-
+      test('Sets key', () {
+        final binding =
+            Binding<int>().withName('n').toProvide(() => 5).singleton();
         expect(binding.key, int);
       });
 
-      test('Binding check singleton', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue)
-            .singleton();
-
+      test('isSingleton is true', () {
+        final binding =
+            Binding<int>().withName('n').toProvide(() => 5).singleton();
         expect(binding.isSingleton, true);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue)
-            .singleton();
-
-        expect(binding.provider, expectedValue);
+      test('Returns singleton value', () {
+        final binding =
+            Binding<int>().withName('n').toProvide(() => 5).singleton();
+        expect(binding.provider, 5);
       });
 
-      test('Binding check value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue)
-            .singleton();
-
-        expect(binding.name, 'expectedValue');
+      test('Sets name', () {
+        final binding =
+            Binding<int>().withName('n').toProvide(() => 5).singleton();
+        expect(binding.name, 'n');
       });
+    });
 
-      test('Binding resolves value', () {
-        final expectedValue = 5;
-        final binding = Binding<int>()
-            .withName('expectedValue')
-            .toProvide(() => expectedValue)
-            .singleton();
-        expect(binding.provider, expectedValue);
-      });
+    test('Chained withName and singleton preserves mode', () {
+      final binding =
+          Binding<int>().toProvide(() => 3).withName("named").singleton();
+      expect(binding.mode, Mode.providerInstance);
+    });
+  });
+
+  // --- WithName / Named binding, isNamed, edge-cases ---
+  group('Named binding & helpers', () {
+    test('withName sets isNamed true and stores name', () {
+      final binding = Binding<int>().withName('foo');
+      expect(binding.isNamed, true);
+      expect(binding.name, 'foo');
+    });
+
+    test('providerWithParams returns null if not set', () {
+      final binding = Binding<int>();
+      expect(binding.providerWithParams(123), null);
     });
   });
 }
diff --git a/cherrypick/test/src/scope_test.dart b/cherrypick/test/src/scope_test.dart
index 267cac8..738ae74 100644
--- a/cherrypick/test/src/scope_test.dart
+++ b/cherrypick/test/src/scope_test.dart
@@ -3,46 +3,44 @@ import 'package:cherrypick/src/scope.dart';
 import 'package:test/test.dart';
 
 void main() {
-  group('Without parent scope.', () {
-    test('Parent scope is null.', () {
+  // --------------------------------------------------------------------------
+  group('Scope & Subscope Management', () {
+    test('Scope has no parent if constructed with null', () {
       final scope = Scope(null);
       expect(scope.parentScope, null);
     });
 
-    test('Open sub scope.', () {
+    test('Can open and retrieve the same subScope by key', () {
       final scope = Scope(null);
       final subScope = scope.openSubScope('subScope');
       expect(scope.openSubScope('subScope'), subScope);
     });
 
-    test("Container throws state error if the value can't be resolved", () {
+    test('closeSubScope removes subscope so next openSubScope returns new', () {
+      final scope = Scope(null);
+      final subScope = scope.openSubScope("child");
+      expect(scope.openSubScope("child"), same(subScope));
+      scope.closeSubScope("child");
+      final newSubScope = scope.openSubScope("child");
+      expect(newSubScope, isNot(same(subScope)));
+    });
+  });
+
+  // --------------------------------------------------------------------------
+  group('Dependency Resolution (standard)', () {
+    test("Throws StateError if value can't be resolved", () {
       final scope = Scope(null);
       expect(() => scope.resolve<String>(), throwsA(isA<StateError>()));
     });
 
-    test('Container resolves value after adding a dependency', () {
+    test('Resolves value after adding a dependency', () {
       final expectedValue = 'test string';
       final scope = Scope(null)
           .installModules([TestModule<String>(value: expectedValue)]);
       expect(scope.resolve<String>(), expectedValue);
     });
-  });
 
-  group('With parent scope.', () {
-    /*  
-    test(
-        "Container bind() throws state error (if it's parent already has a resolver)",
-        () {
-      final parentScope = new Scope(null)
-          .installModules([TestModule<String>(value: "string one")]);
-      final scope = new Scope(parentScope);
-
-      expect(
-          () => scope.installModules([TestModule<String>(value: "string two")]),
-          throwsA(isA<StateError>()));
-    });
-*/
-    test('Container resolve() returns a value from parent container.', () {
+    test('Returns a value from parent scope', () {
       final expectedValue = 5;
       final parentScope = Scope(null);
       final scope = Scope(parentScope);
@@ -52,8 +50,7 @@ void main() {
       expect(scope.resolve<int>(), expectedValue);
     });
 
-    test('Container resolve() returns a  several value from parent container.',
-        () {
+    test('Returns several values from parent container', () {
       final expectedIntValue = 5;
       final expectedStringValue = 'Hello world';
       final parentScope = Scope(null).installModules([
@@ -66,15 +63,126 @@ void main() {
       expect(scope.resolve<String>(), expectedStringValue);
     });
 
-    test("Container resolve() throws a state error if parent hasn't value too.",
-        () {
+    test("Throws StateError if parent hasn't value too", () {
       final parentScope = Scope(null);
       final scope = Scope(parentScope);
       expect(() => scope.resolve<int>(), throwsA(isA<StateError>()));
     });
+
+    test("After dropModules resolves fail", () {
+      final scope = Scope(null)..installModules([TestModule<int>(value: 5)]);
+      expect(scope.resolve<int>(), 5);
+      scope.dropModules();
+      expect(() => scope.resolve<int>(), throwsA(isA<StateError>()));
+    });
+  });
+
+  // --------------------------------------------------------------------------
+  group('Named Dependencies', () {
+    test('Resolve named binding', () {
+      final scope = Scope(null)
+        ..installModules([
+          TestModule<String>(value: "first"),
+          TestModule<String>(value: "second", name: "special")
+        ]);
+      expect(scope.resolve<String>(named: "special"), "second");
+      expect(scope.resolve<String>(), "first");
+    });
+
+    test('Named binding does not clash with unnamed', () {
+      final scope = Scope(null)
+        ..installModules([
+          TestModule<String>(value: "foo", name: "bar"),
+        ]);
+      expect(() => scope.resolve<String>(), throwsA(isA<StateError>()));
+      expect(scope.resolve<String>(named: "bar"), "foo");
+    });
+
+    test("tryResolve returns null for missing named", () {
+      final scope = Scope(null)
+        ..installModules([
+          TestModule<String>(value: "foo"),
+        ]);
+      expect(scope.tryResolve<String>(named: "bar"), isNull);
+    });
+  });
+
+  // --------------------------------------------------------------------------
+  group('Provider with parameters', () {
+    test('Resolve dependency using providerWithParams', () {
+      final scope = Scope(null)
+        ..installModules([
+          _InlineModule((m, s) {
+            m.bind<int>().toProvideWithParams((param) => (param as int) * 2);
+          }),
+        ]);
+      expect(scope.resolve<int>(params: 3), 6);
+      expect(() => scope.resolve<int>(), throwsA(isA<StateError>()));
+    });
+  });
+
+  // --------------------------------------------------------------------------
+  group('Async Resolution', () {
+    test('Resolve async instance', () async {
+      final scope = Scope(null)
+        ..installModules([
+          _InlineModule((m, s) {
+            m.bind<String>().toInstanceAsync(Future.value('async value'));
+          }),
+        ]);
+      expect(await scope.resolveAsync<String>(), "async value");
+    });
+
+    test('Resolve async provider', () async {
+      final scope = Scope(null)
+        ..installModules([
+          _InlineModule((m, s) {
+            m.bind<int>().toProvideAsync(() async => 7);
+          }),
+        ]);
+      expect(await scope.resolveAsync<int>(), 7);
+    });
+
+    test('Resolve async provider with param', () async {
+      final scope = Scope(null)
+        ..installModules([
+          _InlineModule((m, s) {
+            m.bind<int>().toProvideAsyncWithParams((x) async => (x as int) * 3);
+          }),
+        ]);
+      expect(await scope.resolveAsync<int>(params: 2), 6);
+      expect(() => scope.resolveAsync<int>(), throwsA(isA<StateError>()));
+    });
+
+    test('tryResolveAsync returns null for missing', () async {
+      final scope = Scope(null);
+      final result = await scope.tryResolveAsync<String>();
+      expect(result, isNull);
+    });
+  });
+
+  // --------------------------------------------------------------------------
+  group('Optional resolution and error handling', () {
+    test("tryResolve returns null for missing dependency", () {
+      final scope = Scope(null);
+      expect(scope.tryResolve<int>(), isNull);
+    });
+
+    // Не реализован:
+    // test("Container bind() throws state error (if it's parent already has a resolver)", () {
+    //   final parentScope = new Scope(null).installModules([TestModule<String>(value: "string one")]);
+    //   final scope = new Scope(parentScope);
+
+    //   expect(
+    //       () => scope.installModules([TestModule<String>(value: "string two")]),
+    //       throwsA(isA<StateError>()));
+    // });
   });
 }
 
+// ----------------------------------------------------------------------------
+// Вспомогательные модули
+
 class TestModule<T> extends Module {
   final T value;
   final String? name;
@@ -89,3 +197,12 @@ class TestModule<T> extends Module {
     }
   }
 }
+
+/// Вспомогательный модуль для подстановки builder'а через конструктор
+class _InlineModule extends Module {
+  final void Function(Module, Scope) _builder;
+  _InlineModule(this._builder);
+
+  @override
+  void builder(Scope s) => _builder(this, s);
+}
diff --git a/examples/client_app/pubspec.lock b/examples/client_app/pubspec.lock
index 02b6015..1b8f1a3 100644
--- a/examples/client_app/pubspec.lock
+++ b/examples/client_app/pubspec.lock
@@ -28,18 +28,16 @@ packages:
   cherrypick:
     dependency: "direct main"
     description:
-      name: cherrypick
-      sha256: e1e2b4f3a70cbe7760e479e6ddb7dce2fc85a1bbb2fba6c398efe235ed111dfe
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.2"
+      path: "../../cherrypick"
+      relative: true
+    source: path
+    version: "2.1.0"
   cherrypick_flutter:
     dependency: "direct main"
     description:
-      name: cherrypick_flutter
-      sha256: ad63ae816b7d1147ffb0a82bcae5a1ea3d51e9d398a79459c619464391a43a79
-      url: "https://pub.dev"
-    source: hosted
+      path: "../../cherrypick_flutter"
+      relative: true
+    source: path
     version: "1.1.1"
   clock:
     dependency: transitive
diff --git a/examples/postly/pubspec.lock b/examples/postly/pubspec.lock
index 3fcb01b..880c933 100644
--- a/examples/postly/pubspec.lock
+++ b/examples/postly/pubspec.lock
@@ -153,11 +153,10 @@ packages:
   cherrypick:
     dependency: "direct main"
     description:
-      name: cherrypick
-      sha256: e1e2b4f3a70cbe7760e479e6ddb7dce2fc85a1bbb2fba6c398efe235ed111dfe
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.2"
+      path: "../../cherrypick"
+      relative: true
+    source: path
+    version: "2.1.0"
   clock:
     dependency: transitive
     description: