A baseline test for the noop negotiator

Author: Byron

Cargo.lock

@@ -17,3 +17,6 @@ gix-hash = { version = "^0.11.1", path = "../gix-hash" }
 gix-object = { version = "^0.29.2", path = "../gix-object" }
 gix-commitgraph = { version = "^0.15.0", path = "../gix-commitgraph" }
 gix-revision = { version = "^0.14.0", path = "../gix-revision" }
+
+[dev-dependencies]
+gix-testtools = { path = "../tests/tools" }

gix-negotiate/Cargo.toml

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6c75bf41bf8b98eec86b6876fd2129d4194232795fd1bc9f315a26cda2efa2c6
+size 18356

gix-negotiate/tests/fixtures/generated-archives/make_repos.tar.xz

@@ -0,0 +1,73 @@
+#!/bin/bash
+set -eu -o pipefail
+
+function tick () {
+  if test -z "${tick+set}"
+  then
+    tick=1112911993
+  else
+    tick=$(($tick + 60))
+  fi
+  GIT_COMMITTER_DATE="$tick -0700"
+  GIT_AUTHOR_DATE="$tick -0700"
+  export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
+}
+
+tick
+function commit() {
+  local message=${1:?first argument is the commit message}
+  local file="$message.t"
+  echo "$1" > "$file"
+  git add -- "$file"
+  git commit -m "$message"
+  git tag "$message"
+  tick
+}
+
+function negotiation_tips () {
+  local tips=""
+  for arg in "$@"; do
+    tips+=" --negotiation-tip=$arg"
+  done
+  echo "$tips"
+}
+
+function trace_fetch_baseline () {
+  for algo in noop consecutive skipping; do
+    GIT_TRACE_PACKET="$PWD/baseline.$algo" \
+    git -C client -c fetch.negotiationAlgorithm="$algo" fetch --negotiate-only $(negotiation_tips "$@") \
+      --upload-pack 'unset GIT_TRACE_PACKET; git-upload-pack' \
+      file://$PWD/server || :
+  done
+}
+
+
+(mkdir no_parents && cd no_parents
+  (git init -q server && cd server
+    commit to_fetch
+  )
+
+  (git init -q client && cd client
+    for i in $(seq 7); do
+      commit c$i
+    done
+  )
+
+  trace_fetch_baseline main
+)
+
+(mkdir two_colliding_skips && cd two_colliding_skips
+  (git init -q server && cd server
+    commit to_fetch
+  )
+
+  (git init -q client && cd client
+    for i in $(seq 11); do
+      commit c$i
+    done
+    git checkout c5
+    commit c5side
+  )
+
+  trace_fetch_baseline HEAD main
+)

gix-negotiate/tests/fixtures/make_repos.sh

@@ -1,3 +1,5 @@
+use gix_testtools::Result;
+
 mod window_size {
     use gix_negotiate::window_size;
 
@@ -31,3 +33,16 @@ mod window_size {
         }
     }
 }
+
+mod baseline {
+    use std::path::PathBuf;
+
+    #[test]
+    fn run() {
+        let _base = case_dir("no_parents");
+    }
+
+    fn case_dir(name: &str) -> crate::Result<PathBuf> {
+        Ok(gix_testtools::scripted_fixture_read_only("make_repos.sh")?.join(name))
+    }
+}