--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg-web/repository_sync_test.sh	Tue Aug 04 04:16:45 2026 -0700
@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+if [[ -n "${RUNFILES_DIR:-}" ]]; then
+  source "$RUNFILES_DIR/bazel_tools/tools/bash/runfiles/runfiles.bash"
+elif [[ -n "${RUNFILES_MANIFEST_FILE:-}" ]]; then
+  runfiles_library="$(
+    grep -sm1 '^bazel_tools/tools/bash/runfiles/runfiles.bash ' \
+      "$RUNFILES_MANIFEST_FILE" | cut -d' ' -f2-
+  )"
+  source "$runfiles_library"
+else
+  echo "Bazel runfiles are unavailable." >&2
+  exit 1
+fi
+
+hg_binary="$(rlocation _main/third_party/mercurial/runtime/bin/hg)"
+root="${TEST_TMPDIR:?}/repository-sync"
+source_repository="$root/source"
+production_repository="$root/production"
+bundle="$root/workspace.hg"
+mkdir -p "$root"
+
+HGRCPATH= "$hg_binary" init "$source_repository"
+printf 'base\n' > "$source_repository/file.txt"
+HGRCPATH= "$hg_binary" --cwd "$source_repository" add file.txt
+HGRCPATH= "$hg_binary" --cwd "$source_repository" \
+  commit -u test -m base
+
+HGRCPATH= "$hg_binary" clone \
+  "$source_repository" "$production_repository"
+
+printf 'workspace\n' >> "$source_repository/file.txt"
+HGRCPATH= "$hg_binary" --cwd "$source_repository" \
+  commit -u test -m workspace
+
+printf 'production\n' >> "$production_repository/file.txt"
+HGRCPATH= "$hg_binary" --cwd "$production_repository" \
+  commit -u test -m production
+
+HGRCPATH= "$hg_binary" --repository "$source_repository" \
+  bundle --all "$bundle"
+HGRCPATH= "$hg_binary" --repository "$production_repository" \
+  pull "$bundle"
+
+descriptions="$(
+  HGRCPATH= "$hg_binary" --repository "$production_repository" \
+    log -T '{desc}\n'
+)"
+grep -qx workspace <<<"$descriptions"
+grep -qx production <<<"$descriptions"
+[[ "$(
+  HGRCPATH= "$hg_binary" --repository "$production_repository" \
+    heads -T '.'
+)" == ".." ]]