From 7f1d231b4772b4acca79df4ba1e21da6a99c3044 Mon Sep 17 00:00:00 2001
From: devsuyash-Hq <sarpalesuyash9@gmail.com>
Date: Wed, 12 Aug 2026 01:12:18 +0530
Subject: [PATCH] Fix MongoDBContainer default wait strategy for init scripts
 (#3066)

---
 .../testcontainers/mongodb/MongoDBContainer.java  |  2 ++
 .../mongodb/MongoDBContainerTest.java             | 15 +++++++++++++++
 modules/mongodb/src/test/resources/mongo-init.js  |  3 +++
 3 files changed, 20 insertions(+)
 create mode 100644 modules/mongodb/src/test/resources/mongo-init.js

diff --git a/modules/mongodb/src/main/java/org/testcontainers/mongodb/MongoDBContainer.java b/modules/mongodb/src/main/java/org/testcontainers/mongodb/MongoDBContainer.java
index c61be6675ba..3da75d58968 100644
--- a/modules/mongodb/src/main/java/org/testcontainers/mongodb/MongoDBContainer.java
+++ b/modules/mongodb/src/main/java/org/testcontainers/mongodb/MongoDBContainer.java
@@ -54,6 +54,8 @@ public MongoDBContainer(DockerImageName dockerImageName) {
         dockerImageName.assertCompatibleWith(DEFAULT_IMAGE_NAME, COMMUNITY_SERVER_IMAGE, ENTERPRISE_SERVER_IMAGE);
 
         withExposedPorts(MONGODB_INTERNAL_PORT);
+
+        waitingFor(Wait.forLogMessage("(?i).*waiting for connections.*", 1));
     }
 
     @Override
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..59262f8e4de 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 +1,7 @@
 package org.testcontainers.mongodb;
 
 import org.junit.jupiter.api.Test;
+import org.testcontainers.utility.MountableFile;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -38,4 +39,18 @@ void shouldTestDatabaseName() {
             assertThat(mongoDBContainer.getReplicaSetUrl(databaseName)).endsWith(databaseName);
         }
     }
+
+    @Test
+    void shouldStartWithInitScript() {
+        try (
+            MongoDBContainer mongoDBContainer = new MongoDBContainer("mongo:6.0")
+                .withCopyFileToContainer(
+                    MountableFile.forClasspathResource("mongo-init.js"),
+                    "/docker-entrypoint-initdb.d/mongo-init.js"
+                )
+        ) {
+            mongoDBContainer.start();
+            System.out.println("Container started successfully: " + mongoDBContainer.getConnectionString());
+        }
+    }
 }
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..806d35e69c8
--- /dev/null
+++ b/modules/mongodb/src/test/resources/mongo-init.js
@@ -0,0 +1,3 @@
+db = db.getSiblingDB('testdb');
+db.createCollection('testcollection');
+db.testcollection.insertOne({ message: 'init script ran' });