Migrate CI integration tests from SVN-based setup to wp-env

[GaryJones]

Problem

The current GitHub Actions workflow for integration tests uses an SVN-based setup (composer prepare-ci / bin/install-wp-tests.sh) to download WordPress test files. Starting with ubuntu-22.04 (and ubuntu-latest which now points to ubuntu-24.04), Subversion is no longer pre-installed on GitHub Actions runners.

This causes the workflow to fail with:

svn: command not found

Proposed Solution

Migrate to @wordpress/env (wp-env) for running integration tests. This aligns with our plugin standards and provides several benefits:

Why wp-env instead of adding SVN?

• Consistency: Same environment for local development and CI
• No SVN dependency: Eliminates reliance on legacy tooling
• Better isolation: Docker-based environment
• Faster startup: Cached Docker images
• Standard approach: Matches WordPress core/Gutenberg practices and other plugins in this org (e.g., ad-code-manager, liveblog)

Implementation Steps

1. [ ] Ensure .wp-env.json exists and is correctly configured

2. [ ] Update .github/workflows/integrations.yml to use wp-env pattern:

   - name: Install wordpress environment
     run: npm install -g @wordpress/env
   
   - name: Setup wp-env
     run: wp-env start
     env:
       WP_ENV_CORE: WordPress/WordPress#${{ matrix.wordpress }}
   
   - name: Run integration tests (single site)
     run: composer test:integration
   
   - name: Run integration tests (multisite)
     run: composer test:integration-ms
   

3. [ ] Update composer.json scripts to run tests via wp-env:

   {
     "scripts": {
       "test:integration": "wp-env run tests-cli --env-cwd=wp-content/plugins/syndication ./vendor/bin/phpunit --testsuite integration",
       "test:integration-ms": "wp-env run tests-cli --env-cwd=wp-content/plugins/syndication /bin/bash -c 'WP_MULTISITE=1 ./vendor/bin/phpunit --testsuite integration'"
     }
   }
   

4. [ ] Update tests/bootstrap.php if needed to work with wp-env's test environment

5. [ ] Remove legacy bin/install-wp-tests.sh and related composer prepare-ci script if no longer needed

6. [ ] Verify tests pass locally and in CI