From 3f3c664c6375e25ad612c6d591735d0c048e2a71 Mon Sep 17 00:00:00 2001
From: HuseynBlv <129767381+HuseynBlv@users.noreply.github.com>
Date: Sun, 12 Jul 2026 15:16:38 +0400
Subject: [PATCH] Add MongoDB init script regression test

---
 .../mongodb/MongoDBContainerTest.java         | 27 +++++++++++++++++++
 .../mongodb/src/test/resources/mongo-init.js  |  2 ++
 2 files changed, 29 insertions(+)
 create mode 100644 modules/mongodb/src/test/resources/mongo-init.js

diff --git a/modules/mongodb/src/test/java/org/testcontainers/mongodb/MongoDBContainerTest.java b/modules/mongodb/src/test/java/org/testcontainers/mongodb/MongoDBContainerTest.java
index 816243d769e..57a0fc51b81 100644
--- a/modules/mongodb/src/test/java/org/testcontainers/mongodb/MongoDBContainerTest.java
+++ b/modules/mongodb/src/test/java/org/testcontainers/mongodb/MongoDBContainerTest.java
@@ -1,6 +1,10 @@
 package org.testcontainers.mongodb;
 
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+import org.bson.Document;
 import org.junit.jupiter.api.Test;
+import org.testcontainers.utility.MountableFile;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -30,6 +34,29 @@ void supportsMongoDB_7_0() {
         }
     }
 
+    @Test
+    void shouldRunInitScript() {
+        try (
+            MongoDBContainer mongoDBContainer = new MongoDBContainer("mongo:4.0.10")
+                .withCopyFileToContainer(
+                    MountableFile.forClasspathResource("mongo-init.js"),
+                    "/docker-entrypoint-initdb.d/mongo-init.js"
+                )
+        ) {
+            mongoDBContainer.start();
+
+            try (MongoClient mongoClient = MongoClients.create(mongoDBContainer.getConnectionString())) {
+                final Document document = mongoClient
+                    .getDatabase("init-script-db")
+                    .getCollection("messages")
+                    .find()
+                    .first();
+
+                assertThat(document).containsEntry("message", "init script ran");
+            }
+        }
+    }
+
     @Test
     void shouldTestDatabaseName() {
         try (MongoDBContainer mongoDBContainer = new MongoDBContainer("mongo:4.0.10")) {
diff --git a/modules/mongodb/src/test/resources/mongo-init.js b/modules/mongodb/src/test/resources/mongo-init.js
new file mode 100644
index 00000000000..e4e6fbed2f2
--- /dev/null
+++ b/modules/mongodb/src/test/resources/mongo-init.js
@@ -0,0 +1,2 @@
+db = db.getSiblingDB("init-script-db");
+db.messages.insertOne({ message: "init script ran" });