test/downgrade/dry_run_does_not_apply_changes_test.dart

// Copyright (c) 2014, the Dart 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:path/path.dart' as path;
import 'package:test/test.dart';

import 'package:pub/src/io.dart';

import '../descriptor.dart' as d;
import '../test_pub.dart';

main() {
  test("--dry-run shows report but does not apply changes", () async {
    await servePackages((builder) {
      builder.serve("foo", "1.0.0");
      builder.serve("foo", "2.0.0");
    });

    // Create the first lockfile.
    await d.appDir({"foo": "2.0.0"}).create();

    await pubGet();

    // Change the pubspec.
    await d.appDir({"foo": "any"}).create();

    // Also delete the "packages" directory.
    deleteEntry(path.join(d.sandbox, appPath, "packages"));

    // Do the dry run.
    await pubDowngrade(
        args: ["--dry-run"],
        output: allOf(
            [contains("< foo 1.0.0"), contains("Would change 1 dependency.")]));

    await d.dir(appPath, [
      // The lockfile should be unmodified.
      d.file("pubspec.lock", contains("2.0.0")),
      // The "packages" directory should not have been regenerated.
      d.nothing("packages")
    ]).validate();
  });
}