)
'
+test_expect_success 'preparing second superproject with a nested submodule plus partial clone' '
+ test_create_repo supersuper &&
+ (
+ cd supersuper &&
+ echo "I am super super." >file &&
+ git add file &&
+ git commit -m B-super-super-initial
+ git submodule add "file://$base_dir/super" subwithsub &&
+ git commit -m B-super-super-added &&
+ git submodule update --init --recursive &&
+ git repack -ad
+ ) &&
+ git clone supersuper supersuper2 &&
+ (
+ cd supersuper2 &&
+ git submodule update --init
+ )
+'
+
+# At this point there are three root-level positories: A, B, super and super2
+
+test_expect_success 'nested submodule alternate in works and is actually used' '
+ test_when_finished "rm -rf supersuper-clone" &&
+ git clone --recursive --reference supersuper supersuper supersuper-clone &&
+ (
+ cd supersuper-clone &&
+ # test superproject has alternates setup correctly
+ test_alternate_is_used .git/objects/info/alternates . &&
+ # immediate submodule has alternate:
+ test_alternate_is_used .git/modules/subwithsub/objects/info/alternates subwithsub &&
+ # nested submodule also has alternate:
+ test_alternate_is_used .git/modules/subwithsub/modules/sub/objects/info/alternates subwithsub/sub
+ )
+'
+
+check_that_two_of_three_alternates_are_used() {
+ test_alternate_is_used .git/objects/info/alternates . &&
+ # immediate submodule has alternate:
+ test_alternate_is_used .git/modules/subwithsub/objects/info/alternates subwithsub &&
+ # but nested submodule has no alternate:
+ test_must_fail test_alternate_is_used .git/modules/subwithsub/modules/sub/objects/info/alternates subwithsub/sub
+}
+
+
+test_expect_success 'missing nested submodule alternate fails clone and submodule update' '
+ test_when_finished "rm -rf supersuper-clone" &&
+ test_must_fail git clone --recursive --reference supersuper2 supersuper2 supersuper-clone &&
+ (
+ cd supersuper-clone &&
+ check_that_two_of_three_alternates_are_used &&
+ # update of the submodule fails
+ test_must_fail git submodule update --init --recursive
+ )
+'
+
+test_expect_success 'missing nested submodule alternate in --reference-if-able mode' '
+ test_when_finished "rm -rf supersuper-clone" &&
+ git clone --recursive --reference-if-able supersuper2 supersuper2 supersuper-clone &&
+ (
+ cd supersuper-clone &&
+ check_that_two_of_three_alternates_are_used &&
+ # update of the submodule succeeds
+ git submodule update --init --recursive
+ )
+'
+
test_done