zefyr/packages/zefyr/test/fast_diff_test.dart

// Copyright (c) 2018, the Zefyr project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:zefyr/src/fast_diff.dart';

void main() {
  group('fastDiff', () {
    test('insert', () {
      var oldText = 'fastDiff';
      var newText = 'fasterDiff';
      var result = fastDiff(oldText, newText, 6);
      expect(result.start, 4);
      expect(result.deleted, "");
      expect(result.inserted, "er");
      expect("$result", 'DiffResult[4, "", "er"]');
    });

    test('delete', () {
      var oldText = 'fastDiff';
      var newText = 'fasDiff';
      var result = fastDiff(oldText, newText, 3);
      expect(result.start, 3);
      expect(result.deleted, "t");
      expect(result.inserted, "");
    });

    test('replace', () {
      var oldText = 'fastDiff';
      var newText = 'fas_Diff';
      var result = fastDiff(oldText, newText, 4);
      expect(result.start, 3);
      expect(result.deleted, "t");
      expect(result.inserted, "_");
    });
  });
}