Install before starting the server if the lockfile is out of date.

sdk/lib/_internal/pub/test/serve/does_not_install_first_if_locked_version_matches_test.dart

Index: sdk/lib/_internal/pub/test/serve/does_not_install_first_if_locked_version_matches_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/does_not_install_first_if_locked_version_matches_test.dart b/sdk/lib/_internal/pub/test/serve/does_not_install_first_if_locked_version_matches_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..fd2c2ffccee289056aa11b88e83c133e30789f98
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/serve/does_not_install_first_if_locked_version_matches_test.dart
@@ -0,0 +1,48 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 'dart:json' as json;
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+
+main() {
+  initConfig();
+  integration("does not install if the locked version of a dependency is "
+      "allowed by the pubspec's constraint", () {
+    d.dir("foo", [
+      d.libPubspec("foo", "0.0.1"),
+      d.libDir("foo")
+    ]).create();
+
+    // Install to get "foo" into the lock file.
+    d.dir(appPath, [
+      d.appPubspec({
+        "foo": {
+          "path": "../foo",
+          "version": ">=0.0.1"
+        },
+      })
+    ]).create();
+    pubInstall();
+
+    // Change the version.
+    d.dir(appPath, [
+      d.appPubspec({
+        "foo": {
+          "path": "../foo",
+          "version": "<2.0.0"
+        },
+      })
+    ]).create();
+
+    startPubServe(shouldInstallFirst: false);
+    requestShouldSucceed("packages/foo/foo.dart", 'main() => "foo";');
+    endPubServe();
+  });
+}