diff --git a/git-refspec/tests/fixtures/generated-archives/make_baseline.tar.xz b/git-refspec/tests/fixtures/generated-archives/make_baseline.tar.xz
new file mode 100644
index 0000000000..c8c9489050
--- /dev/null
+++ b/git-refspec/tests/fixtures/generated-archives/make_baseline.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0a85fe0b4d9fb179baab26ea008ddbb48a657d4e92561c42a213269468481a66
+size 9308
diff --git a/git-refspec/tests/fixtures/make_baseline.sh b/git-refspec/tests/fixtures/make_baseline.sh
new file mode 100644
index 0000000000..cb9fcfc3bc
--- /dev/null
+++ b/git-refspec/tests/fixtures/make_baseline.sh
@@ -0,0 +1,91 @@
+#!/bin/bash
+set -eu -o pipefail
+
+git init;
+
+function baseline() {
+    local kind=$1
+    local refspec=$2
+
+  cat <<EOF >.git/config
+[remote "test"]
+  url = .
+  $kind = "$refspec"
+EOF
+
+    git ls-remote "test" && status=0 || status=$?
+    {
+        echo "$kind" "$refspec"
+        echo "$status"
+    } >> baseline.git
+}
+
+
+# invalid
+
+baseline push ''
+baseline push '::'
+baseline fetch '::'
+
+baseline push 'refs/heads/*:refs/remotes/frotz'
+baseline push 'refs/heads:refs/remotes/frotz/*'
+
+baseline fetch 'refs/heads/*:refs/remotes/frotz'
+baseline fetch 'refs/heads:refs/remotes/frotz/*'
+baseline fetch 'refs/heads/main::refs/remotes/frotz/xyzzy'
+baseline fetch 'refs/heads/maste :refs/remotes/frotz/xyzzy'
+baseline fetch 'main~1:refs/remotes/frotz/backup'
+baseline fetch 'HEAD~4:refs/remotes/frotz/new'
+baseline push 'refs/heads/ nitfol'
+baseline fetch 'refs/heads/ nitfol'
+baseline push 'HEAD:'
+baseline push 'refs/heads/ nitfol:'
+baseline fetch 'refs/heads/ nitfol:'
+baseline push ':refs/remotes/frotz/delete me'
+baseline fetch ':refs/remotes/frotz/HEAD to me'
+baseline fetch 'refs/heads/*/*/for-linus:refs/remotes/mine/*'
+baseline push 'refs/heads/*/*/for-linus:refs/remotes/mine/*'
+
+baseline fetch 'refs/heads/*g*/for-linus:refs/remotes/mine/*'
+baseline push 'refs/heads/*g*/for-linus:refs/remotes/mine/*'
+bad=$(printf '\011tab')
+baseline fetch "refs/heads/${bad}"
+
+# valid
+baseline push '+:'
+baseline push ':'
+
+baseline fetch ''
+baseline fetch ':'
+baseline push 'refs/heads/main:refs/remotes/frotz/xyzzy'
+baseline push 'refs/heads/*:refs/remotes/frotz/*'
+
+
+baseline fetch 'refs/heads/*:refs/remotes/frotz/*'
+baseline fetch 'refs/heads/main:refs/remotes/frotz/xyzzy'
+
+baseline push 'main~1:refs/remotes/frotz/backup'
+baseline push 'HEAD~4:refs/remotes/frotz/new'
+
+baseline push 'HEAD'
+baseline fetch 'HEAD'
+baseline push '@'
+baseline fetch '@'
+
+baseline fetch 'HEAD:'
+
+baseline push ':refs/remotes/frotz/deleteme'
+baseline fetch ':refs/remotes/frotz/HEAD-to-me'
+
+baseline fetch 'refs/heads/*/for-linus:refs/remotes/mine/*-blah'
+baseline push 'refs/heads/*/for-linus:refs/remotes/mine/*-blah'
+
+baseline fetch 'refs/heads*/for-linus:refs/remotes/mine/*'
+baseline push 'refs/heads*/for-linus:refs/remotes/mine/*'
+
+
+baseline fetch 'refs/heads/*/for-linus:refs/remotes/mine/*'
+baseline push 'refs/heads/*/for-linus:refs/remotes/mine/*'
+
+good=$(printf '\303\204')
+baseline fetch "refs/heads/${good}"
diff --git a/git-refspec/tests/parse/mod.rs b/git-refspec/tests/parse/mod.rs
new file mode 100644
index 0000000000..a388d8284c
--- /dev/null
+++ b/git-refspec/tests/parse/mod.rs
@@ -0,0 +1,7 @@
+use git_testtools::scripted_fixture_repo_read_only;
+
+#[test]
+#[ignore]
+fn baseline() {
+    let _dir = scripted_fixture_repo_read_only("make_baseline.sh").unwrap();
+}
diff --git a/git-refspec/tests/refspec.rs b/git-refspec/tests/refspec.rs
index 8b13789179..06f1a3c69d 100644
--- a/git-refspec/tests/refspec.rs
+++ b/git-refspec/tests/refspec.rs
@@ -1 +1 @@
-
+mod parse;