docker-testcontainers

Q: How do I install docker-testcontainers?

Run npx skills add https://github.com/full-stack-skills/docker-skills --skill docker-testcontainers in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/docker-testcontainers/ (personal) or .claude/skills/docker-testcontainers/ (project).

by full-stack-skillsDevOps & Cloud

Guidance for Testcontainers — running Docker containers in automated integration tests. Covers Java (@Testcontainers, @Container, PostgreSQL/Redis/Kafka/Elasticsearch), Python (testcontainers-python with pytest), container lifecycle management (singleton, reuse), CI/CD integration (Docker-in-Docker, Ryuk), Testcontainer best practices, and database migration testing. Use when the user asks about testcontainers, integration testing with Docker, database testing, Java testcontainers, Python testcontainers, or needs to test with real Docker services. 使用场景：testcontainers、集成测试、docker 测试、数据库测试、Java Testcontainers、Python Testcontainers.

Installs: 106
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/full-stack-skills/docker-skills --skill docker-testcontainers

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads docker-testcontainers automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Docker Testcontainers — 集成测试容器

Guidance for running Docker containers in automated tests with Testcontainers.

When to Use

ALWAYS use this skill when the user mentions:

"testcontainers", "Testcontainer", "测试容器"
"集成测试", "docker 测试"
"数据库测试", "PostgreSQL test", "MySQL test"
"Java Testcontainers", "Python Testcontainers"
"测试环境搭建"

Java — Testcontainers

PostgreSQL Example

@Testcontainers
@SpringBootTest
class OrderRepositoryTest {

    @Container
    static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:16-alpine")
            .withDatabaseName("testdb")
            .withUsername("test")
            .withPassword("test");

    @DynamicPropertySource
    static void configure(DynamicPropertyRegistry registry) {
        registry.add("spring.datasource.url", postgres::getJdbcUrl);
        registry.add("spring.datasource.username", postgres::getUsername);
        registry.add("spring.datasource.password", postgres::getPassword);
    }

    @Test
    void shouldSaveAndFindOrder() {
        Order saved = repository.save(new Order(...));
        assertThat(repository.findById(saved.getId())).isPresent();
    }
}

Redis Example

@Container
static GenericContainer<?> redis = new GenericContainer<>("redis:7-alpine")
        .withExposedPorts(6379);

// Get connection string
String redisUrl = "redis://" + redis.getHost() + ":" + redis.getMappedPort(6379);

Kafka Example

@Container
static KafkaContainer kafka = new KafkaContainer(
        DockerImageName.parse("confluentinc/cp-kafka:7.6.0"));

String bootstrapServers = kafka.getBootstrapServers();

Python — testcontainers-python

import pytest
from testcontainers.postgres import PostgresContainer
from testcontainers.redis import RedisContainer

@pytest.fixture(scope="module")
def postgres():
    with PostgresContainer("postgres:16-alpine") as pg:
        yield pg.get_connection_url()

def test_database_connection(postgres):
    import psycopg2
    conn = psycopg2.connect(postgres)
    assert conn.status == psycopg2.STATUS_READY

Container Lifecycle

// Singleton: one container for all tests
@Container
static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:16");

// Per-test: new container for each test
@Test
void test() {
    try (var redis = new GenericContainer<>("redis:7")) {
        redis.start();
        // test...
    } // auto-closed by try-with-resources
}

CI/CD Configuration

# GitHub Actions — DinD (Docker-in-Docker)
jobs:
  test:
    runs-on: ubuntu-latest
    services:
      docker:
        image: docker:27-dind
        options: --privileged
    steps:
      - uses: actions/checkout@v4
      - run: ./gradlew test

Workflow — 推荐集成流程

Step 1: 添加依赖: testImplementation 'org.testcontainers:testcontainers:1.20.6' Step 2: 定义容器: @Container static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:16-alpine") Step 3: 注入配置: @DynamicPropertySource 将容器连接信息注入 Spring 配置 Step 4: 编写测试: @Test void shouldSaveAndFind() 正常业务测试 Step 5: CI 加速: 启用 withReuse(true) + GHA cache

Gotchas — Common Pitfalls

CI slow startup: Container images need to be pulled in CI. → Recovery: Pre-warm by adding docker pull postgres:16-alpine before test step; enable withReuse(true) in .testcontainers.properties.
Port conflicts in CI: Testcontainers picks random ports — no conflicts. But hardcoded ports in tests will fail. → Recovery: Always use container.getMappedPort(5432) instead of hardcoding port numbers.
Resource cleanup: Ryuk auto-removes containers. In CI, ensure DinD or socket access. → Recovery: If TESTCONTAINERS_RYUK_DISABLED=true, add @AfterAll cleanup; check Docker socket is mounted in CI.
Static vs instance containers: Static @Container fields share ONE container across the class. Instance fields create per-test containers. → Recovery: Use static for databases (shared state OK); use instance for isolation-critical tests; check @TestInstance(TestInstance.Lifecycle.PER_CLASS) for JUnit 5.

Boundary — 能力边界（适用与不适用场景）

分类	场景	说明
✅ 能做	Java/Python 集成测试	PostgreSQL/MySQL/Redis/Kafka 等容器化数据库测试
✅ 能做	Spring Boot 测试	@Testcontainers + @DynamicPropertySource 自动注入
✅ 能做	CI 集成	GitHub Actions/Jenkins 中自动启动/清理
⚠️ 需条件	跨 JVM 复用	需配置 `testcontainers.reuse.enable=true`
⚠️ 需条件	非 Java 语言测试	使用各语言对应 Testcontainers 库
❌ 超范围	手动测试/调试	使用 `docker-run`
❌ 超范围	生产数据库测试	连接生产实例而非容器
❌ 超范围	性能/压测	专用工具（JMeter/K6）

When NOT to Use This Skill

❌ Skip	✅ Use Instead
Manual testing	`docker-run`
Production database testing	`docker-storage` + real instance
Mock testing	Use Mockito/unittest.mock
Docker basics	`docker-basics`

Security & Stability

Testcontainers use random ports — no port conflicts with running services.
Containers are automatically cleaned up by Ryuk after test completion.
Never use Testcontainers in production code — test scope only.
Use withReuse(true) for local development to speed up tests (container survives between runs).

📚 官方文档参考

文档	地址
Testcontainers 概述	https://docs.docker.com/testcontainers/
Testcontainers for Java	https://java.testcontainers.org/
Testcontainers Cloud	https://testcontainers.com/cloud/
Spring Boot 集成	https://java.testcontainers.org/modules/spring-boot/
CI 配置	https://java.testcontainers.org/supported_docker_environment/continuous_integration/

🧭 Docker Skills Journey

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FAQ

Q1: 如何快速上手此技能？ A: 参考上方的快速开始章节，按步骤操作即可。

Q2: 遇到版本不兼容问题怎么办？ A: 检查依赖版本，使用 lock 文件锁定，参考常见陷阱章节。

Q3: 如何在生产环境使用？ A: 参考最佳实践章节，确保配置正确，做好监控和日志。

Q4: 性能如何优化？ A: 参考性能优化相关文档，使用缓存、索引等手段。

Q5: 如何贡献或反馈问题？ A: 在 GitHub 仓库提交 Issue 或 Pull Request。

Q6: 是否支持中文？ A: 支持中文文档和中文注释，详见国内适配章节。

FAQ

What does the docker-testcontainers skill do?

How do I install docker-testcontainers?

Run npx skills add https://github.com/full-stack-skills/docker-skills --skill docker-testcontainers in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/docker-testcontainers/ (personal) or .claude/skills/docker-testcontainers/ (project).

Which AI agents can use docker-testcontainers?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is docker-testcontainers safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains docker-testcontainers?

It is published by full-stack-skills in full-stack-skills/docker-skills. It has 106 recorded installs.