Add zookeeper example (#6059)

Demonstrate how to use Apache Zookeeper along with `GenericContainer`.

Fixes #1514

Author: eddumelendez

docs/examples.md

@@ -14,3 +14,4 @@ Examples of different use cases provided by Testcontainers can be found below:
 - [Spring Boot with Kotlin](https://github.com/testcontainers/testcontainers-java/tree/main/examples/spring-boot-kotlin-redis)
 - [TestNG](https://github.com/testcontainers/testcontainers-java/tree/main/examples/redis-backed-cache-testng)
 - [ImmuDb](https://github.com/testcontainers/testcontainers-java/tree/main/examples/immudb)
+- [Zookeeper](https://github.com/testcontainers/testcontainers-java/tree/main/examples/zookeper)

examples/settings.gradle

@@ -31,6 +31,7 @@ include 'spring-boot'
 include 'cucumber'
 include 'spring-boot-kotlin-redis'
 include 'immudb'
+include 'zookeeper'
 
 ext.isCI = System.getenv("CI") != null
 

examples/zookeeper/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+    id 'java'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.apache.curator:curator-framework:5.3.0'
+    testImplementation 'org.testcontainers:testcontainers'
+    testImplementation 'org.assertj:assertj-core:3.23.1'
+    testImplementation 'ch.qos.logback:logback-classic:1.2.11'
+}

examples/zookeeper/src/test/java/com/example/ZookeeperContainerTest.java

@@ -0,0 +1,41 @@
+package com.example;
+
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.curator.framework.CuratorFrameworkFactory;
+import org.apache.curator.retry.RetryOneTime;
+import org.junit.Test;
+import org.testcontainers.containers.GenericContainer;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ZookeeperContainerTest {
+
+    private static final int ZOOKEEPER_PORT = 2181;
+
+    @Test
+    public void test() throws Exception {
+        String path = "/messages/zk-tc";
+        String content = "Running Zookeeper with Testcontainers";
+        try (
+            GenericContainer<?> zookeeper = new GenericContainer<>("zookeeper:3.8.0").withExposedPorts(ZOOKEEPER_PORT)
+        ) {
+            zookeeper.start();
+
+            String connectionString = zookeeper.getHost() + ":" + zookeeper.getMappedPort(ZOOKEEPER_PORT);
+            CuratorFramework curatorFramework = CuratorFrameworkFactory
+                .builder()
+                .connectString(connectionString)
+                .retryPolicy(new RetryOneTime(100))
+                .build();
+            curatorFramework.start();
+            curatorFramework.create().creatingParentsIfNeeded().forPath(path, content.getBytes());
+
+            byte[] bytes = curatorFramework.getData().forPath(path);
+            curatorFramework.close();
+
+            assertThat(new String(bytes, StandardCharsets.UTF_8)).isEqualTo(content);
+        }
+    }
+}

examples/zookeeper/src/test/resources/logback-test.xml

@@ -0,0 +1,16 @@
+<configuration>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <!-- encoders are assigned the type
+             ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+
+    <logger name="org.testcontainers" level="INFO"/>
+</configuration>