Remove dead test code

test/flutter_circular_chart_test.dart

@@ -3,11 +3,5 @@ import 'package:test/test.dart';
 import 'package:flutter_circular_chart/flutter_circular_chart.dart';
 
 void main() {
-  test('adds one to input values', () {
-    final calculator = new Calculator();
-    expect(calculator.addOne(2), 3);
-    expect(calculator.addOne(-7), -6);
-    expect(calculator.addOne(0), 1);
-    expect(() => calculator.addOne(null), throwsNoSuchMethodError);
-  });
+
 }