Switch to backtracking solver.

utils/tests/pub/sdk_constraint_test.dart

-// Copyright (c) 2012, 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.
-
-library check_sdk_test;
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import 'descriptor.dart' as d;
-import "test_pub.dart";
-
-main() {
-  initConfig();
-
-  for (var command in ["install", "update"]) {
-    var success = new RegExp(r"Dependencies installed!$");
-    if (command == "update") {
-      success = new RegExp(r"Dependencies updated!$");
-    }
-
-    integration("gives a friendly message if there are no constraints", () {
-      d.dir(appPath, [
-        d.pubspec({"name": "myapp"}),
-      ]).create();
-
-      schedulePub(args: [command], output: success);
-    });
-
-    integration("gives an error if the root package does not match", () {
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "environment": {"sdk": ">2.0.0"}
-        })
-      ]).create();
-
-      schedulePub(args: [command],
-          error:
-            """
-            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
-            - 'myapp' requires >2.0.0
-
-            You may be able to resolve this by upgrading to the latest Dart SDK
-            or adding a version constraint to use an older version of a package.
-            """);
-    });
-
-    integration("gives an error if some dependencies do not match", () {
-      // Using a path source, but this should be true of all sources.
-      d.dir("foo", [
-        d.libPubspec("foo", "0.0.1", sdk: ">0.1.3"),
-        d.libDir("foo")
-      ]).create();
-      d.dir("bar", [
-        d.libPubspec("bar", "0.0.1", sdk: ">0.1.1"),
-        d.libDir("bar")
-      ]).create();
-
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "dependencies": {
-            "foo": {"path": "../foo"},
-            "bar": {"path": "../bar"}
-          },
-          "environment": {"sdk": ">2.0.0"}
-        })
-      ]).create();
-
-      schedulePub(args: [command],
-          error:
-            """
-            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
-            - 'myapp' requires >2.0.0
-            - 'foo' requires >0.1.3
-
-            You may be able to resolve this by upgrading to the latest Dart SDK
-            or adding a version constraint to use an older version of a package.
-            """);
-    });
-
-    integration("gives an error if a transitive dependency doesn't match", () {
-      // Using a path source, but this should be true of all sources.
-      d.dir("foo", [
-        d.libPubspec("foo", "0.0.1", deps: [
-          {"path": "../bar"}
-        ]),
-        d.libDir("foo")
-      ]).create();
-      d.dir("bar", [
-        d.libPubspec("bar", "0.0.1", sdk: "<0.1.1"),
-        d.libDir("bar")
-      ]).create();
-
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "dependencies": {
-            "foo": {"path": "../foo"}
-          }
-        })
-      ]).create();
-
-      schedulePub(args: [command],
-          error:
-            """
-            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
-            - 'bar' requires <0.1.1
-
-            You may be able to resolve this by upgrading to the latest Dart SDK
-            or adding a version constraint to use an older version of a package.
-            """);
-    });
-
-    integration("handles a circular dependency on the root package", () {
-      // Using a path source, but this should be true of all sources.
-      d.dir("foo", [
-        d.libPubspec("foo", "0.0.1", sdk: ">3.0.0", deps: [
-          {"path": "../myapp"}
-        ]),
-        d.libDir("foo")
-      ]).create();
-
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "dependencies": {
-            "foo": {"path": "../foo"}
-          },
-          "environment": {"sdk": ">2.0.0"}
-        })
-      ]).create();
-
-      schedulePub(args: [command],
-          error:
-            """
-            Some packages that were installed are not compatible with your SDK version 0.1.2+3 and may not work:
-            - 'myapp' requires >2.0.0
-            - 'foo' requires >3.0.0
-
-            You may be able to resolve this by upgrading to the latest Dart SDK
-            or adding a version constraint to use an older version of a package.
-            """);
-    });
-  }
-}