sdk/lib/_internal/pub/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:scheduled_test/scheduled_test.dart';

import '../../lib/src/io.dart';
import '../descriptor.dart' as d;
import '../test_pub.dart';

main() {
  initConfig();
  integration("--dry-run shows report but does not apply changes", () {
    servePackages([
      packageMap("foo", "1.0.0"),
      packageMap("foo", "2.0.0"),
    ]);

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

    pubGet();

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

    // Also delete the "packages" directory.
    schedule(() {
      deleteEntry(path.join(sandboxDir, appPath, "packages"));
    });

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

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