add(unixfs): sharded to non-sharded resolving test

unixfs/src/dir.rs

@@ -233,6 +233,7 @@ mod tests {
     use cid::Cid;
     use hex_literal::hex;
     use std::convert::TryFrom;
+    use crate::file::tests::FakeBlockstore;
 
     #[test]
     fn resolve_paths_from_plain_dagpb() {
@@ -285,4 +286,28 @@ mod tests {
         // that we dont know how to resolve through this
         resolve(&payload[..], "anything", &mut None).unwrap_err();
     }
+
+    #[test]
+    fn sharded_directory_linking_to_non_sharded() {
+        // created this test case out of doubt that we could fail a traversal as ShardedLookup
+        // expects the linked cids to be hamt shards. However that cannot happen as we only resolve
+        // a single step.
+        let blocks = FakeBlockstore::with_fixtures();
+
+        let block = blocks.get_by_str("QmQXUANxYGpkwMTWQUdZBPx9jqfFP7acNgL4FHRWkndKCe");
+
+        let next = match resolve(&block[..], "non_sharded_dir", &mut None).unwrap() {
+            MaybeResolved::Found(cid) => cid,
+            x => unreachable!("{:?}", x),
+        };
+
+        let block = blocks.get_by_cid(&next);
+
+        let next = match resolve(&block[..], "foobar", &mut None).unwrap() {
+            MaybeResolved::Found(cid) => cid,
+            x => unreachable!("{:?}", x),
+        };
+
+        assert_eq!(&next.to_string(), "QmRgutAxd8t7oGkSm4wmeuByG6M51wcTso6cubDdQtuEfL");
+    }
 }

unixfs/src/file.rs

@@ -362,6 +362,16 @@ pub(crate) mod tests {
                 // symlink linking to "foobar": QmNgQEdXVdLw79nH2bnxLMxnyWMaXrijfqMTiDVat3iyuz
                 &hex!("0a0a08041206666f6f626172"),
 
+                // sharded directory with single link to a non-sharded directory
+                // QmQXUANxYGpkwMTWQUdZBPx9jqfFP7acNgL4FHRWkndKCe
+                &hex!("12390a2212209b04586b8bdc01a7e0db04b8358a3717954572720f6b6803af5eec781cf73801121146416e6f6e5f736861726465645f64697218430a290805122004000000000000000000000000000000000000000000000000000000000000002822308002"),
+
+                // the non-sharded directory linked by the the above sharded directory
+                // QmYmmkD3dGZjuozuqSzDYjU4ZyhAgc4T4P4SUgY6qjzBi8
+                &hex!("122e0a22122031c3d57080d8463a3c63b2923df5a1d40ad7a73eae5a14af584213e5f504ac331206666f6f626172180f0a020801"),
+
+                // single block version of "foobar\n" linked to by above non-sharded directory
+                &hex!("0a0d08021207666f6f6261720a1807"),
             ];
 
             for block in foobar_blocks {