Ensure that a locked git dependency is downloaded correctly.

sdk/lib/_internal/pub/test/get/git/locked_revision_without_repo_test.dart

Index: sdk/lib/_internal/pub/test/get/git/locked_revision_without_repo_test.dart
diff --git a/sdk/lib/_internal/pub/test/get/git/lock_version_test.dart b/sdk/lib/_internal/pub/test/get/git/locked_revision_without_repo_test.dart
similarity index 81%
copy from sdk/lib/_internal/pub/test/get/git/lock_version_test.dart
copy to sdk/lib/_internal/pub/test/get/git/locked_revision_without_repo_test.dart
index 0d764576155b5a3639e47bf47d7b021edc574297..137e38414cae1301a8ae884c82c754a592299c1e 100644
--- a/sdk/lib/_internal/pub/test/get/git/lock_version_test.dart
+++ b/sdk/lib/_internal/pub/test/get/git/locked_revision_without_repo_test.dart
@@ -11,9 +11,11 @@ import '../../../lib/src/io.dart';
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
+// Regression test for issue 16470.
+
 main() {
   initConfig();
-  integration('keeps a Git package locked to the version in the lockfile', () {
+  integration('checks out the repository for a locked revision', () {
     ensureGit();
 
     d.git('foo.git', [
@@ -32,8 +34,10 @@ main() {
       ])
     ]).validate();
 
-    // Delete the packages path to simulate a new checkout of the application.
+    // Delete the packages path and the cache to simulate a brand new checkout
+    // of the application.
     schedule(() => deleteEntry(path.join(sandboxDir, packagesPath)));
+    schedule(() => deleteEntry(path.join(sandboxDir, cachePath)));
 
     d.git('foo.git', [
       d.libDir('foo', 'foo 2'),