{"slug":"marisha-sahay-junit5-mockito-testcontainers","name":"junit5-mockito-testcontainers","description":"Guidelines for writing robust, modern Java tests using JUnit 5, Mockito, and Testcontainers.","long_description":"---\nname: junit5-mockito-testcontainers\ndescription: Guidelines for writing robust, modern Java tests using JUnit 5, Mockito, and Testcontainers.\n---\n\n# Testing Mastery Skill\n\nThis skill focuses on best practices for writing high-quality tests in modern Java applications.\n\n## Testing Pattern\nEnforce the AAA (Arrange, Act, Assert) or BDD (Given, When, Then) pattern in all tests to ensure tests are highly readable and structured consistently.\n\n**Example Context:**\n```java\n@Test\nvoid shouldCalculateTotalCorrectly() {\n    // Arrange\n    Order order = new Order(100.0, 0.1); // price, discount\n    \n    // Act\n    double total = orderService.calculateTotal(order);\n    \n    // Assert\n    assertThat(total).isEqualTo(90.0);\n}\n```\n\n## Mocking\nInstruct the agent to avoid over-mocking. Mock external boundaries and slow dependencies, but use real domain objects. Avoid mocking simple value types or internal application logic when possible. Use Mockito 5+ for all mocking needs.\n\n**Example Context:**\n```java\n@ExtendWith(MockitoExtension.class)\nclass OrderServiceTest {\n\n    @Mock\n    private PaymentClient paymentClient; // External boundary\n\n    @InjectMocks\n    private OrderService orderService;\n\n    @Test\n    void shouldProcessPayment() {\n        // Arrange\n        OrderRequest request = new OrderRequest(\"C123\", new BigDecimal(\"100.0\"));\n        given(paymentClient.charge(any())).willReturn(true);\n\n        // Act & Assert\n        assertThat(orderService.process(request)).isTrue();\n        verify(paymentClient).charge(any());\n    }\n}\n```\n\n## Integration Tests\nMandate the use of **Testcontainers** for database integration testing instead of relying on in-memory databases like H2. This ensures environment parity and prevents bugs that only occur in the production database system.\n\n**Example Context:**\n```java\n@Testcontainers\n@SpringBootTest\nclass OrderRepositoryTest {\n\n    @Container\n    static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>(\"postgres:15-alpine\");\n\n    @DynamicPropertySource\n    static void registerPgProperties(DynamicPropertyRegistry registry) {\n        registry.add(\"spring.datasource.url\", postgres::getJdbcUrl);\n        registry.add(\"spring.datasource.username\", postgres::getUsername);\n        registry.add(\"spring.datasource.password\", postgres::getPassword);\n    }\n    \n    // tests here...\n}\n```\n\n## Frameworks\nSpecify JUnit 5 (Jupiter) for the testing framework and Mockito 5+ for mocking.\n","tagline":"Guidelines for writing robust, modern Java tests using JUnit 5, Mockito, and Testcontainers.","category":"design-creative","commerce":{"type":"unknown","billing":"unknown","amount":null,"currency":null,"sourceUrl":null,"checkedAt":null,"runtime":"unknown","purchaseUrl":null,"checkout":"external","purchaseRequiresUserConsent":true},"tags":["agent-skill"],"author":"Marisha-Sahay","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"github candidate review","sourceDetail":"Marisha-Sahay/awesome-java-agent-skills","creatorName":"Marisha-Sahay","creatorUrl":"https://github.com/Marisha-Sahay","sourceUrl":"https://github.com/Marisha-Sahay/awesome-java-agent-skills/tree/main/skills/testing/junit5-mockito-testcontainers","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/marisha-sahay-junit5-mockito-testcontainers#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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