test(e2e): add e2e tests

[shabaraba]

Why

This project needs end-to-end tests to verify the kintone Java client works correctly against a real kintone environment. Unit tests with mocks are valuable for testing internal logic, but they cannot catch issues with actual API integration, authentication flows, and real-world scenarios.

What

Added E2E Test Infrastructure

• GitHub Actions workflow (.github/workflows/e2e.yml):

  • Runs on push to master and manual dispatch
  • Supports specifying individual test classes
  • Includes proxy and authenticated proxy test jobs
  • Publishes JUnit test reports
  • Concurrency control to prevent parallel E2E runs

• Test environment setup (e2e-tests/):

  • Gradle-based standalone test project
  • Environment variable configuration for kintone credentials
  • Docker-based proxy server for proxy tests
  • Helper scripts for running tests and updating client JAR

• Test coverage:

  • App API (settings, customize, ACL, fields, layout, views, reports, notifications, process management, actions)
  • Record API (CRUD, comments, cursor, bulk operations)
  • Space API (threads, members, body updates)
  • File API (upload/download)
  • Plugin API (install, uninstall, get apps)
  • Schema API (API list, schema retrieval)
  • Bulk Requests API

Pre-created App Approach

Tests use pre-created kintone resources instead of creating new apps for each test run. This approach:

• Prevents accumulation of test apps that cannot be deleted via API
• Enables consistent test execution in CI
• Requires pre-configured test resources (apps, spaces, users)

Known Limitations (Disabled Tests)

The following tests are @Disabled due to API or test environment constraints. All are covered by unit tests.

Test	Reason	Unit Test Coverage
DeployTest.addApp()	Apps cannot be deleted after creation	AppClientTest.addApp_*
DeployTest.deployApp_getDeployStatus()	Apps cannot be deleted after creation	AppClientTest.deployApp_*, AppClientTest.getDeployStatus_*
DeployTest.deployApp_revert()	Apps cannot be deleted after creation	AppClientTest.deployApp_*
AppPluginsTest.addPlugins()	Plugins cannot be deleted from app after adding	AppClientTest.addPlugins_*
AppApiTest.getStatistics()	Requires AppStatistics model update for new API fields	AppClientTest.getStatistics_*
SpaceApiTest.deleteSpace()	Requires space recreation (not available with pre-created resources)	SpaceClientTest.deleteSpace_*
SpaceApiTest.getStatistics()	Requires SpaceStatistics model update for new API fields	SpaceClientTest.getStatistics_*

How to test

1. Copy .env.example to .env and configure your kintone credentials:

   cd e2e-tests
   cp .env.example .env
   # Edit .env with your kintone environment settings

2. Create required test apps in kintone (see e2e-tests/README.md)
3. Run tests locally:

   ./bin/run-test.sh

4. Or run specific test class:

   ./bin/run-test.sh --tests RecordApiTest

Checklist

• Read CONTRIBUTING.md at the repository.
• Updated documentation if it is required.
• Added/updated tests if it is required. (or tested manually)