diff --git a/scripts/run-tests-in-container.sh b/scripts/run-tests-in-container.sh
new file mode 100755
index 0000000..b3f5a1f
--- /dev/null
+++ b/scripts/run-tests-in-container.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# Run tests in a Node.js container (for consistent environment)
+
+set -e
+
+echo "Running tests in node:20-alpine container..."
+echo "This avoids Node.js setup time and ensures consistent environment."
+echo ""
+
+# Run unit tests in container
+docker run --rm \
+  -v "$(pwd):/app" \
+  -w /app \
+  node:20-alpine \
+  sh -c "apk add --no-cache bash git && npm ci && npm run test:run"