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test/unit_test.dart

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+// This is an example unit test.
+//
+// A unit test tests a single function, method, or class. To learn more about
+// writing unit tests, visit
+// https://flutter.dev/to/unit-testing
+
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('Plus Operator', () {
+    test('should add two numbers together', () {
+      expect(1 + 1, 2);
+    });
+  });
+}