Create binstubs for executables when activating a package.

sdk/lib/_internal/pub/test/global/binstubs/name_collision_test.dart

Index: sdk/lib/_internal/pub/test/global/binstubs/name_collision_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/binstubs/name_collision_test.dart b/sdk/lib/_internal/pub/test/global/binstubs/name_collision_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0ec1c4fe9df2d74befb2a25402fbfc4042704d13
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/global/binstubs/name_collision_test.dart
@@ -0,0 +1,61 @@
+// Copyright (c) 2014, 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 'package:scheduled_test/scheduled_stream.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration("does not overwrite an existing binstub", () {
+    d.dir("foo", [
+      d.pubspec({
+        "name": "foo",
+        "executables": {
+          "foo": "foo",
+          "collide1": "foo",
+          "collide2": "foo"
+        }
+      }),
+      d.dir("bin", [
+        d.file("foo.dart", "main() => print('ok');")
+      ])
+    ]).create();
+
+    d.dir("bar", [
+      d.pubspec({
+        "name": "bar",
+        "executables": {
+          "bar": "bar",
+          "collide1": "bar",
+          "collide2": "bar"
+        }
+      }),
+      d.dir("bin", [
+        d.file("bar.dart", "main() => print('ok');")
+      ])
+    ]).create();
+
+    schedulePub(args: ["global", "activate", "-spath", "../foo"]);
+
+    var pub = startPub(args: ["global", "activate", "-spath", "../bar"]);
+    pub.stdout.expect(consumeThrough("Installed executable bar."));
+    pub.stderr.expect("Executable collide1 was already installed from foo.");
+    pub.stderr.expect("Executable collide2 was already installed from foo.");
+    pub.stderr.expect("Deactivate the other package(s) or activate bar using "
+        "--overwrite-executables.");
+    pub.shouldExit();
+
+    d.dir(cachePath, [
+      d.dir("bin", [
+        d.matcherFile("foo", contains("foo:foo")),
+        d.matcherFile("bar", contains("bar:bar")),
+        d.matcherFile("collide1", contains("foo:foo")),
+        d.matcherFile("collide2", contains("foo:foo"))
+      ])
+    ]).validate();
+  });
+}