Show detailed report on upgrade.

sdk/lib/_internal/pub/test/upgrade/report/describes_change_test.dart

Index: sdk/lib/_internal/pub/test/upgrade/report/describes_change_test.dart
diff --git a/sdk/lib/_internal/pub/test/upgrade/report/describes_change_test.dart b/sdk/lib/_internal/pub/test/upgrade/report/describes_change_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9bb02a5dee598efd733701adf547860faec20faf
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/upgrade/report/describes_change_test.dart
@@ -0,0 +1,62 @@
+// 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.
+
+library pub_tests;
+
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration("shows how package changed from previous lockfile", () {
+    servePackages([
+      packageMap("unchanged", "1.0.0"),
+      packageMap("version_changed", "1.0.0"),
+      packageMap("version_changed", "2.0.0"),
+      packageMap("source_changed", "1.0.0")
+    ]);
+
+    d.dir("source_changed", [
+      d.libDir("source_changed"),
+      d.libPubspec("source_changed", "2.0.0")
+    ]).create();
+
+    d.dir("description_changed_1", [
+      d.libDir("description_changed"),
+      d.libPubspec("description_changed", "1.0.0")
+    ]).create();
+
+    d.dir("description_changed_2", [
+      d.libDir("description_changed"),
+      d.libPubspec("description_changed", "1.0.0")
+    ]).create();
+
+    // Create the first lockfile.
+    d.appDir({
+      "unchanged": "any",
+      "version_changed": "1.0.0",
+      "source_changed": "any",
+      "description_changed": {"path": "../description_changed_1"}
+    }).create();
+
+    pubGet();
+
+    // Change the pubspec.
+    d.appDir({
+      "unchanged": "any",
+      "version_changed": "any",
+      "source_changed": {"path": "../source_changed"},
+      "description_changed": {"path": "../description_changed_2"}
+    }).create();
+
+    // Upgrade everything.
+    pubUpgrade(output: new RegExp(r"""
+Resolving dependencies\.+
+. description_changed 1\.0\.0 from path \.\.[/\\]description_changed_2 \(was 1\.0\.0 from path \.\.[/\\]description_changed_1\)
+. source_changed 2\.0\.0 from path \.\.[/\\]source_changed \(was 1\.0\.0\)
+. unchanged 1\.0\.0
+. version_changed 2\.0\.0 \(was 1\.0\.0\)
+""", multiLine: true));
+  });
+}