chore: add hamt directory sharding test

test/sharness/t0115-gateway-dir-listing.sh

@@ -13,14 +13,34 @@ test_description="Test directory listing (dir-index-html) on the HTTP gateway"
 
 test_expect_success "ipfs init" '
   export IPFS_PATH="$(pwd)/.ipfs" &&
-  ipfs init --profile=test > /dev/null
+  ipfs init --empty-repo --profile=test > /dev/null
 '
 
 test_launch_ipfs_daemon_without_network
 
+# HAMT-sharded directory test. We must execute this test first as we want to
+# start from an empty repository and count the exact number of refs we want.
+HAMT_CID=bafybeiggvykl7skb2ndlmacg2k5modvudocffxjesexlod2pfvg5yhwrqm
+HAMT_REFS_CID=bafybeicv4utmj46mgbpamvw2k6zg4qjs5yvspfnlxz2y6iuey5smjfcn4a
+HAMT_REFS_COUNT=963
+
+test_expect_success "hamt: import fixture with necessary refs" '
+  ipfs dag import ../t0115-gateway-dir-listing/hamt-refs.car &&
+  ipfs refs local | wc -l | tr -d " " > refs_count_actual &&
+  echo $HAMT_REFS_COUNT > refs_count_expected &&
+  test_cmp refs_count_expected refs_count_actual
+'
+
+test_expect_success "hamt: fetch directory from gateway in offline mode" '
+  curl --max-time 1 -sD - http://127.0.0.1:$GWAY_PORT/ipfs/$HAMT_CID/ > hamt_list_response &&
+  ipfs refs local | wc -l | tr -d " " > refs_count_actual &&
+  echo $HAMT_REFS_COUNT > refs_count_expected &&
+  test_cmp refs_count_expected refs_count_actual
+'
+
 # Import test case
 # See the static fixtures in ./t0115-gateway-dir-listing/
-test_expect_success "Add the test directory" '
+test_expect_success "add remaining test fixtures" '
   ipfs dag import ../t0115-gateway-dir-listing/fixtures.car
 '
 DIR_CID=bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i # ./rootDir/

test/sharness/t0115-gateway-dir-listing/README.md

@@ -2,8 +2,12 @@
 
 - fixtures.car
   - raw CARv1
+- hamt-refs.car
+  - raw CARv1 containing all the necessary blocks to present a directory listing
+    for `bafybeiggvykl7skb2ndlmacg2k5modvudocffxjesexlod2pfvg5yhwrqm`, which is
+    a directory containing over 10k items.
 
-generated with:
+fixutres.car generated with:
 
 ```sh
 # using ipfs version 0.18.1
@@ -30,3 +34,20 @@ ipfs dag export ${DIR_CID} > ./fixtures.car
 # FILE_CID=bafkreialihlqnf5uwo4byh4n3cmwlntwqzxxs2fg5vanqdi3d7tb2l5xkm # ./rootDir/ą/ę/file-źł.txt
 # FILE_SIZE=34
 ```
+
+hamt-refs.car generated with:
+
+```sh
+# using ipfs version 0.18.1
+export IPFS_PATH=$(mktemp -d)
+ipfs init --empty-repo
+ipfs daemon &
+curl http://127.0.0.1:8080/ipfs/bafybeiggvykl7skb2ndlmacg2k5modvudocffxjesexlod2pfvg5yhwrqm/
+killall ipfs
+ipfs refs local >> refs
+ipfs files mkdir --cid-version 1 /Test
+cat refs | xargs -I {} ipfs files cp /ipfs/{} /Test/{}
+ipfs files stat /Test
+# Grab CID: bafybeicv4utmj46mgbpamvw2k6zg4qjs5yvspfnlxz2y6iuey5smjfcn4a
+ipfs dag export bafybeicv4utmj46mgbpamvw2k6zg4qjs5yvspfnlxz2y6iuey5smjfcn4a > ./refs.car
+```