Fix unit tests

lib/src/object.dart

@@ -23,7 +23,7 @@ extension NullableExtensions on Object? {
   /// Allows performing an action if the object is not null.
   ///
   /// [action] The function to execute if the object is not null.
-  void run(void Function(Object it) action) {
+  void runWithAction(void Function(Object it) action) {
     if (this != null) {
       action(this!);
     }

test/object_test.dart

@@ -42,14 +42,14 @@ void main() {
       // ignore: unnecessary_nullable_for_final_variable_declarations
       const Object? value = 'World';
       String? result;
-      value.run((it) => result = 'Hello, ${it as String}');
+      value.runWithAction((it) => result = 'Hello, ${it as String}');
       expect(result, 'Hello, World');
     });
 
     test('run should not execute action if object is null', () {
       const Object? value = null;
       String? result = 'Hello';
-      value.run((it) => result = 'World');
+      value.runWithAction((it) => result = 'World');
       expect(result, 'Hello'); // Result should be unchanged
     });
 

test/stream_test.dart

@@ -211,6 +211,11 @@ void main() {
       expect(actionCalled, isFalse);
     });
 
+    test('unwrap throws error if stream is null', () async {
+      const Stream<int?>? nullableStream = null;
+      expect(() => nullableStream.unwrap().first, throwsA('Stream is null'));
+    });
+
     test('unwrap throws error if stream contains null value', () async {
       final Stream<int?> nullableStream = Stream.value(null);
       expect(() => nullableStream.unwrap().first, throwsA('Value is null'));