test(history-rewrite): add non-interactive test for clean_history script

scripts/history-rewrite/tests/clean_history.non_interactive.bats

@@ -0,0 +1,42 @@
+#!/usr/bin/env bats
+
+setup() {
+  TMPREPO=$(mktemp -d)
+  cd "$TMPREPO"
+  git init -q
+  # local git identity
+  git config user.email "test@example.com"
+  git config user.name "Test Runner"
+  # create a directory that matches the paths to be pruned
+  mkdir -p backend/codeql-db
+  echo "dummy" > backend/codeql-db/keep.txt
+  git add -A && git commit -m 'add test files' -q
+  git checkout -b feature/test
+  # Create a local bare repo to act as origin and allow git push
+  TMPORIGIN=$(mktemp -d)
+  git init --bare "$TMPORIGIN" >/dev/null
+  git remote add origin "$TMPORIGIN"
+  git push -u origin feature/test >/dev/null 2>&1 || true
+  # Add a stub git-filter-repo to PATH to satisfy requirements without installing
+  STUBBIN=$(mktemp -d)
+  cat > "$STUBBIN/git-filter-repo" <<'SH'
+#!/usr/bin/env bash
+echo "stub git-filter-repo called: $@"
+exit 0
+SH
+  chmod +x "$STUBBIN/git-filter-repo"
+  PATH="$STUBBIN:$PATH"
+}
+
+teardown() {
+  rm -rf "$TMPREPO"
+}
+
+REPO_ROOT=$(cd "$BATS_TEST_DIRNAME/../../../" && pwd)
+SCRIPT="$REPO_ROOT/scripts/history-rewrite/clean_history.sh"
+
+@test "clean_history non-interactive + force runs without prompting and invokes git-filter-repo" {
+  run bash "$SCRIPT" --force --non-interactive --paths 'backend/codeql-db' --strip-size 1
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"stub git-filter-repo called"* ]]
+}