diff --git a/tests/alt_mysql_user_restore_post_pre_cleanup_tiers_test.sh b/tests/alt_mysql_user_restore_post_pre_cleanup_tiers_test.sh
index 2847b59..cbfb676 100755
--- a/tests/alt_mysql_user_restore_post_pre_cleanup_tiers_test.sh
+++ b/tests/alt_mysql_user_restore_post_pre_cleanup_tiers_test.sh
@@ -51,4 +51,69 @@ grep -q "CALLED native_staging_migrate" "$CALL_LOG" || fail "expected the native
 # imported, so it never touches demo_ok again.
 grep -q "\-\-skip demo_ok" "$CALL_LOG" || fail "expected native-staging-migrate to be told to skip demo_ok, log: $(cat "$CALL_LOG")"
 
+### Scenario A: native-backup-restore script unavailable must not abort the restore.
+mkdir -p "$TMP_DIR/fake_bin_a"
+
+cat > "$TMP_DIR/fake_bin_a/da_restore_native_staging_to_alt_mysql.sh" <<'EOF'
+#!/bin/bash
+echo "CALLED native_staging_migrate $*" >> "$FAKE_CALL_LOG"
+EOF
+chmod 755 "$TMP_DIR/fake_bin_a/da_restore_native_staging_to_alt_mysql.sh"
+
+mkdir -p "$TMP_DIR/empty_restore_root_a"
+
+CALL_LOG="$TMP_DIR/calls_a.log"
+: > "$CALL_LOG"
+
+DA_ALT_MYSQL_RESTORE_LOG="$TMP_DIR/restore_a.log" \
+DA_ALT_MYSQL_NATIVE_BACKUP_RESTORE_BIN="$TMP_DIR/fake_bin_a/does-not-exist.sh" \
+DA_ALT_MYSQL_NATIVE_STAGING_BIN="$TMP_DIR/fake_bin_a/da_restore_native_staging_to_alt_mysql.sh" \
+DA_ALT_MYSQL_SETTINGS_FILE="$TMP_DIR/missing-settings.conf" \
+FAKE_CALL_LOG="$CALL_LOG" \
+restore_path="$TMP_DIR/empty_restore_root_a" \
+username="demo" \
+bash "$SCRIPT" demo && rc=0 || rc=$?
+[ "$rc" -eq 0 ] || fail "expected the hook to exit 0 even when the native-backup-restore script is unavailable, got rc=$rc"
+
+if grep -q "CALLED native_backup_restore" "$CALL_LOG"; then
+  fail "did not expect the native-backup-restore tier to be invoked when its script is missing"
+fi
+grep -q "CALLED native_staging_migrate" "$CALL_LOG" || fail "expected the native-staging-migrate fallback to still run when native-backup-restore is unavailable"
+
+### Scenario B: zero databases imported must still invoke the fallback, with no stray/malformed --skip argument.
+mkdir -p "$TMP_DIR/fake_bin_b"
+
+cat > "$TMP_DIR/fake_bin_b/alt_mysql_native_backup_restore.sh" <<'EOF'
+#!/bin/bash
+echo "CALLED native_backup_restore $*" >> "$FAKE_CALL_LOG"
+echo "SKIPPED demo_only import-failed"
+EOF
+chmod 755 "$TMP_DIR/fake_bin_b/alt_mysql_native_backup_restore.sh"
+
+cat > "$TMP_DIR/fake_bin_b/da_restore_native_staging_to_alt_mysql.sh" <<'EOF'
+#!/bin/bash
+echo "CALLED native_staging_migrate $*" >> "$FAKE_CALL_LOG"
+EOF
+chmod 755 "$TMP_DIR/fake_bin_b/da_restore_native_staging_to_alt_mysql.sh"
+
+mkdir -p "$TMP_DIR/empty_restore_root_b"
+
+CALL_LOG="$TMP_DIR/calls_b.log"
+: > "$CALL_LOG"
+
+DA_ALT_MYSQL_RESTORE_LOG="$TMP_DIR/restore_b.log" \
+DA_ALT_MYSQL_NATIVE_BACKUP_RESTORE_BIN="$TMP_DIR/fake_bin_b/alt_mysql_native_backup_restore.sh" \
+DA_ALT_MYSQL_NATIVE_STAGING_BIN="$TMP_DIR/fake_bin_b/da_restore_native_staging_to_alt_mysql.sh" \
+DA_ALT_MYSQL_SETTINGS_FILE="$TMP_DIR/missing-settings.conf" \
+FAKE_CALL_LOG="$CALL_LOG" \
+restore_path="$TMP_DIR/empty_restore_root_b" \
+username="demo" \
+bash "$SCRIPT" demo
+
+grep -q "CALLED native_staging_migrate" "$CALL_LOG" || fail "expected the native-staging-migrate fallback to still run when zero databases were imported"
+
+if grep "CALLED native_staging_migrate" "$CALL_LOG" | grep -q -- "--skip"; then
+  fail "did not expect a --skip argument to be passed when zero databases were imported, log: $(cat "$CALL_LOG")"
+fi
+
 echo "alt_mysql_user_restore_post_pre_cleanup_tiers_test: OK"