Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/serve/serves_hidden_assets_that_arent_gitignored_test.dart

Index: sdk/lib/_internal/pub_generated/test/serve/serves_hidden_assets_that_arent_gitignored_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/serve/serves_hidden_assets_that_arent_gitignored_test.dart b/sdk/lib/_internal/pub_generated/test/serve/serves_hidden_assets_that_arent_gitignored_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4c59aa9b5612f10bc066c324f07ad121ff740072
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/serve/serves_hidden_assets_that_arent_gitignored_test.dart
@@ -0,0 +1,23 @@
+library pub_tests;
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+main() {
+  initConfig();
+  integration("serves hidden assets that aren't .gitignored", () {
+    ensureGit();
+    d.git(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir(
+                "web",
+                [
+                    d.file(".outer.txt", "outer contents"),
+                    d.dir(".dir", [d.file("inner.txt", "inner contents")])])]).create();
+    pubServe();
+    requestShouldSucceed(".outer.txt", "outer contents");
+    requestShouldSucceed(".dir/inner.txt", "inner contents");
+    endPubServe();
+  });
+}