extract derive_unode_manifest test_utils to a test crate

Summary:
Extract the test utils from derive_unode_manifest to their own crate so that
they can be re-used in future tests.

Reviewed By: StanislavGlebik

Differential Revision: D17282411

fbshipit-source-id: 50410cffe8a912bd07283bc6ac4e97e28663d854

manifest/derive_unode_manifest/derived_data_unodes.rs

@@ -142,7 +142,6 @@ pub(crate) fn get_file_changes(
 #[cfg(test)]
 mod test {
     use super::*;
-    use crate::test_utils::iterate_all_entries;
     use bookmarks::BookmarkName;
     use cloned::cloned;
     use fixtures::{
@@ -153,6 +152,7 @@ mod test {
     use mercurial_types::{Changeset, HgChangesetId, HgManifestId};
     use revset::AncestorsNodeStream;
     use std::sync::Arc;
+    use test_utils::iterate_all_entries;
     use tokio::runtime::Runtime;
 
     fn fetch_manifest_by_cs_id(

manifest/derive_unode_manifest/lib.rs

@@ -28,9 +28,6 @@ use std::collections::BTreeMap;
 pub mod derived_data_unodes;
 pub use derived_data_unodes::{RootUnodeManifestId, RootUnodeManifestMapping};
 
-#[cfg(test)]
-mod test_utils;
-
 #[derive(Debug, Fail)]
 pub enum ErrorKind {
     #[fail(display = "cannot fetch FileUnode: {}", _0)]
@@ -300,7 +297,6 @@ fn return_if_unique_filenode(unodes: &Vec<FileUnode>) -> Option<(&ContentId, &Fi
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::test_utils::{get_bonsai_changeset, iterate_all_entries};
     use blobrepo::save_bonsai_changesets;
     use blobrepo_factory::new_memblob_empty;
     use blobstore::Storable;
@@ -316,6 +312,7 @@ mod tests {
         RepoPath,
     };
     use std::collections::{HashSet, VecDeque};
+    use test_utils::{get_bonsai_changeset, iterate_all_entries};
     use tokio::runtime::Runtime;
 
     #[test]