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

sdk/lib/_internal/pub_generated/test/no_package_symlinks_test.dart

+import 'package:scheduled_test/scheduled_test.dart';
+import 'descriptor.dart' as d;
+import 'test_pub.dart';
+main() {
+  initConfig();
+  forBothPubGetAndUpgrade((command) {
+    group("with --no-package-symlinks", () {
+      integration("installs hosted dependencies to the cache", () {
+        servePackages((builder) {
+          builder.serve("foo", "1.0.0");
+          builder.serve("bar", "1.0.0");
+        });
+        d.appDir({
+          "foo": "any",
+          "bar": "any"
+        }).create();
+        pubCommand(command, args: ["--no-package-symlinks"]);
+        d.nothing("$appPath/packages").validate();
+        d.hostedCache(
+            [
+                d.dir(
+                    "foo-1.0.0",
+                    [d.dir("lib", [d.file("foo.dart", 'main() => "foo 1.0.0";')])]),
+                d.dir(
+                    "bar-1.0.0",
+                    [d.dir("lib", [d.file("bar.dart", 'main() => "bar 1.0.0";')])])]).validate();
+      });
+      integration("installs git dependencies to the cache", () {
+        ensureGit();
+        d.git(
+            'foo.git',
+            [d.libDir('foo'), d.libPubspec('foo', '1.0.0')]).create();
+        d.appDir({
+          "foo": {
+            "git": "../foo.git"
+          }
+        }).create();
+        pubCommand(command, args: ["--no-package-symlinks"]);
+        d.nothing("$appPath/packages").validate();
+        d.dir(
+            cachePath,
+            [
+                d.dir(
+                    'git',
+                    [
+                        d.dir('cache', [d.gitPackageRepoCacheDir('foo')]),
+                        d.gitPackageRevisionCacheDir('foo')])]).validate();
+      });
+      integration("locks path dependencies", () {
+        d.dir("foo", [d.libDir("foo"), d.libPubspec("foo", "0.0.1")]).create();
+        d.dir(appPath, [d.appPubspec({
+            "foo": {
+              "path": "../foo"
+            }
+          })]).create();
+        pubCommand(command, args: ["--no-package-symlinks"]);
+        d.nothing("$appPath/packages").validate();
+        d.matcherFile("$appPath/pubspec.lock", contains("foo"));
+      });
+      integration("removes package directories near entrypoints", () {
+        d.dir(
+            appPath,
+            [
+                d.appPubspec(),
+                d.dir("packages"),
+                d.dir("bin/packages"),
+                d.dir("web/packages"),
+                d.dir("web/subdir/packages")]).create();
+        pubCommand(command, args: ["--no-package-symlinks"]);
+        d.dir(
+            appPath,
+            [
+                d.nothing("packages"),
+                d.nothing("bin/packages"),
+                d.nothing("web/packages"),
+                d.nothing("web/subdir/packages")]).validate();
+      });
+      integration(
+          "doesn't remove package directories that pub wouldn't " "generate",
+          () {
+        d.dir(
+            appPath,
+            [
+                d.appPubspec(),
+                d.dir("packages"),
+                d.dir("bin/subdir/packages"),
+                d.dir("lib/packages")]).create();
+        pubCommand(command, args: ["--no-package-symlinks"]);
+        d.dir(
+            appPath,
+            [
+                d.nothing("packages"),
+                d.dir("bin/subdir/packages"),
+                d.dir("lib/packages")]).validate();
+      });
+    });
+  });
+}