first commit

test/country_code_picker_test.dart

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+import 'package:test/test.dart';
+
+import 'package:country_code_picker/country_code_picker.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);
+  });
+}