Shadow PostgreSQL promotion database preflight

tests/test-promote-database-shadow.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)"
+FILE="$ROOT/ocf/loxthelion/managed-container.d/applications/postgresql/promote.sh"
+
+grep -q '^mc_pg_promote_database_shadow()' "$FILE"
+grep -q '"promote.database"' "$FILE"
+grep -q 'response.get("ready") is not True' "$FILE"
+grep -q 'response.get("mutation") is not False' "$FILE"
+grep -q 'comparison=MATCH' "$FILE"
+grep -q 'promote.database shadow MISMATCH' "$FILE"
+
+SHADOW_LINE="$(
+    grep -n '^[[:space:]]*mc_pg_promote_database_shadow$' "$FILE" |
+    tail -1 |
+    cut -d: -f1
+)"
+
+PROMOTE_LINE="$(
+    grep -n 'exec "\$BINDIR/pg_ctl"' "$FILE" |
+    head -1 |
+    cut -d: -f1
+)"
+
+[ -n "$SHADOW_LINE" ]
+[ -n "$PROMOTE_LINE" ]
+[ "$SHADOW_LINE" -lt "$PROMOTE_LINE" ]
+
+echo "PROMOTE_DATABASE_SHADOW_TEST_PASS=1"