Clean up tests that are duplicated between install and update.

sdk/lib/_internal/pub/test/hosted/offline_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 pub_tests;
+
+import 'dart:io';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+main() {
+  initConfig();
+
+  forBothPubInstallAndUpdate((command) {
+    integration('updates a package using the cache', () {
+      // Run the server so that we know what URL to use in the system cache.
+      servePackages([]);
+
+      d.cacheDir({
+        "foo": ["1.2.2", "1.2.3"],
+        "bar": ["1.2.3"]
+      }, includePubspecs: true).create();
+
+      d.appDir([
+        dependencyMap("foo", "any"),
+        dependencyMap("bar", "any")
+      ]).create();
+
+      var warning = null;
+      if (command == 'update') {
+        warning = "Warning: Updating when offline may not update you "
+                  "to the latest versions of your dependencies.";
+      }
+
+      runPub(command, args: ['--offline'], warning: warning);
+
+      d.packagesDir({
+        "foo": "1.2.3",
+        "bar": "1.2.3"
+      }).validate();
+    });
+
+    integration('fails gracefully if a dependency is not cached', () {
+      // Run the server so that we know what URL to use in the system cache.
+      servePackages([]);
+
+      d.appDir([
+        dependencyMap("foo", "any")
+      ]).create();
+
+      runPub(command, args: ['--offline'],
+          error: new RegExp('Could not find package "foo" in cache'));
+    });
+
+    integration('fails gracefully no cached versions match', () {
+      // Run the server so that we know what URL to use in the system cache.
+      servePackages([]);
+
+      d.cacheDir({
+        "foo": ["1.2.2", "1.2.3"]
+      }, includePubspecs: true).create();
+
+      d.appDir([
+        dependencyMap("foo", ">2.0.0")
+      ]).create();
+
+      runPub(command, args: ['--offline'],
+          error: new RegExp("Package 'foo' has no versions that match >2.0.0"));
+    });
+  });
+}