Create binstubs for executables when activating a package.

sdk/lib/_internal/pub_generated/test/global/binstubs/reactivate_removes_old_executables_test.dart

Index: sdk/lib/_internal/pub_generated/test/global/binstubs/reactivate_removes_old_executables_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/global/binstubs/reactivate_removes_old_executables_test.dart b/sdk/lib/_internal/pub_generated/test/global/binstubs/reactivate_removes_old_executables_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..bda450ab670c942674bbe008ffb07d49cac1c62f
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/global/binstubs/reactivate_removes_old_executables_test.dart
@@ -0,0 +1,34 @@
+import 'package:scheduled_test/scheduled_test.dart';
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration("removes previous binstubs when reactivating a package", () {
+    d.dir("foo", [d.pubspec({
+        "name": "foo",
+        "executables": {
+          "one": null,
+          "two": null
+        }
+      }),
+          d.dir(
+              "bin",
+              [
+                  d.file("one.dart", "main() => print('ok');"),
+                  d.file("two.dart", "main() => print('ok');")])]).create();
+    schedulePub(args: ["global", "activate", "--source", "path", "../foo"]);
+    d.dir("foo", [d.pubspec({
+        "name": "foo",
+        "executables": {
+          "two": null
+        }
+      })]).create();
+    schedulePub(args: ["global", "activate", "--source", "path", "../foo"]);
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                "bin",
+                [d.nothing("one"), d.matcherFile("two", contains("two"))])]).validate();
+  });
+}