Implicitly constrain barback to versions pub supports.

sdk/lib/_internal/pub/test/implicit_barback_dependency_test.dart

+// Copyright (c) 2013, 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 'descriptor.dart' as d;
+import 'test_pub.dart';
+import '../lib/src/barback.dart' as barback;
+import '../lib/src/version.dart';
+
+main() {
+  initConfig();
+
+  var previousVersion = new Version(
+      barback.supportedVersion.major, barback.supportedVersion.minor - 1, 0);
+
+  forBothPubGetAndUpgrade((command) {
+    integration("implicitly constrains barback to versions pub supports", () {
+      servePackages([
+        packageMap("barback", previousVersion.toString()),
+        packageMap("barback", barback.supportedVersion.toString()),
+        packageMap("barback", barback.supportedVersion.nextPatch.toString()),
+        packageMap("barback", barback.supportedVersion.nextMinor.toString())
+      ]);
+
+      d.appDir({
+        "barback": "any"
+      }).create();
+
+      pubCommand(command);
+
+      d.packagesDir({
+        "barback": barback.supportedVersion.nextPatch.toString()
+      }).validate();
+    });
+
+    integration("discovers transitive dependency on barback", () {
+      servePackages([
+        packageMap("barback", previousVersion.toString()),
+        packageMap("barback", barback.supportedVersion.toString()),
+        packageMap("barback", barback.supportedVersion.nextPatch.toString()),
+        packageMap("barback", barback.supportedVersion.nextMinor.toString())
+      ]);
+
+      d.dir("foo", [
+        d.libDir("foo", "foo 0.0.1"),
+        d.libPubspec("foo", "0.0.1", deps: {
+          "barback": "any"
+        })
+      ]).create();
+
+      d.appDir({
+        "foo": {"path": "../foo"}
+      }).create();
+
+      pubCommand(command);
+
+      d.packagesDir({
+        "barback": barback.supportedVersion.nextPatch.toString(),
+        "foo": "0.0.1"
+      }).validate();
+    });
+  });
+
+  integration("unlock if the locked version doesn't meet pub's constraint", () {
+    servePackages([
+      packageMap("barback", previousVersion.toString()),
+      packageMap("barback", barback.supportedVersion.toString())
+    ]);
+
+    d.appDir({"barback": "any"}).create();
+
+    // Hand-create a lockfile to pin barback to an older version.
+    createLockFile("myapp", hosted: {
+      "barback": previousVersion.toString()
+    });
+
+    pubGet();
+
+    // It should be upgraded.
+    d.packagesDir({
+      "barback": barback.supportedVersion.toString()
+    }).validate();
+  });
+}