test: add integrations tests

[vtotalova]

Description

Add database integration tests for repository layer using Testcontainers with PostgreSQL 16.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• 📝 Documentation update
• 🎨 Style/formatting changes (no functional changes)
• ♻️ Code refactoring (no functional changes)
• ⚡ Performance improvements
• 🔧 Configuration changes
• 🧪 Test additions or modifications
• 🚀 Deployment/DevOps changes

Related Issues

• Fixes test: create database model integration tests #27

Changes Made

• Client: N/A
• Server:
  • Added Testcontainers dependencies to build.gradle
  • Created AbstractRepositoryTest and AbstractIntegrationTest base classes
  • Added LearningResourceRepositoryTest (14 tests)
  • Added CompetencyRepositoryTest (12 tests)
  • Added UserRepositoryTest (14 tests)
  • Added application-test.yml for test profile
• Database: N/A
• Other: N/A

Testing

Test Cases

• Existing functionality still works
• New functionality works as expected
• Edge cases handled appropriately

Manual Testing

• Tested in development environment
• Tested with different user roles/permissions (if applicable)

Screenshots/Videos

Before

N/A

After

N/A

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[Copilot]

Pull request overview

Adds PostgreSQL-backed integration tests for the repository layer using Testcontainers, supporting Issue #27 by validating JPA mappings and repository queries against a real database schema (Flyway migrations + ddl-auto=validate).

Changes:

• Add Testcontainers (PostgreSQL) test dependencies to the server Gradle build.
• Introduce shared Testcontainers-backed base test classes for repository and full-context integration tests.
• Add repository integration test suites for User, LearningResource, and Competency repositories, plus a test Spring profile config.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
server/build.gradle	Adds Spring Boot Testcontainers + PostgreSQL Testcontainers dependencies (and Lombok processors for test sources).
server/src/test/resources/application-test.yml	Adds a test profile configuration for JPA/Flyway/logging (and security properties).
server/src/test/java/de/tum/cit/memo/repository/AbstractRepositoryTest.java	Base @DataJpaTest class that starts a PostgreSQL 16 Testcontainer and wires datasource properties.
server/src/test/java/de/tum/cit/memo/AbstractIntegrationTest.java	Base @SpringBootTest class with the same PostgreSQL Testcontainer wiring for future full-stack integration tests.
server/src/test/java/de/tum/cit/memo/repository/UserRepositoryTest.java	Repository integration tests for UserRepository CRUD and email-related queries/constraints.
server/src/test/java/de/tum/cit/memo/repository/LearningResourceRepositoryTest.java	Repository integration tests for LearningResourceRepository, including the random-selection native query.
server/src/test/java/de/tum/cit/memo/repository/CompetencyRepositoryTest.java	Repository integration tests for CompetencyRepository, including the random-selection native query.

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[markstockhausen]

PR looks good, I believe tests are missing for those two repos:

• CompetencyRelationshipRepository
• CompetencyResourceLinkRepository

Once they are done, it can be merged

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[markstockhausen]

CompetencyResourceLink, Competency, LearningResource and User repository tests look good.

CompetencyRelationshipRepositoryTest will not work on main. This branch is missing migrations V5–V7 from the scheduling service PR, which replaced the competency_relationships table:

• V5 drops the old table (relationship_type, user_id)
• V6 recreates it as an aggregated model (vote counters + entropy, no user_id)
• V7 adds degree to competencies

These tests were written against the old V1 schema, so they will fail to compile after rebasing. Please rebase onto main and update CompetencyRelationshipRepositoryTest to match the current schema.

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