diff --git a/tests/test.sh b/tests/test.sh
new file mode 100644
index 0000000..7905058
--- /dev/null
+++ b/tests/test.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+set -euo pipefail
+
+IMAGE="$1"
+FAILED=0
+PASSED=0
+
+TMPDIR="$(mktemp -d)"
+trap 'rm -rf "$TMPDIR"' EXIT
+CONTAINER_NAME="test-crond-$$"
+
+# Test 1: Container starts and crond is running
+docker run -d --name "$CONTAINER_NAME" "$IMAGE"
+sleep 3
+if docker exec "$CONTAINER_NAME" pgrep crond > /dev/null 2>&1; then
+  echo "PASS: crond is running"
+  PASSED=$((PASSED + 1))
+else
+  echo "FAIL: crond is not running"
+  FAILED=$((FAILED + 1))
+fi
+
+docker rm -f "$CONTAINER_NAME" > /dev/null 2>&1 || true
+
+echo ""
+echo "$PASSED/$((PASSED + FAILED)) tests passed"
+if [ "$FAILED" -gt 0 ]; then
+  exit 1
+fi