Enhance project view decorations and add 100% test coverage

.github/workflows/check.yaml

@@ -29,7 +29,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v5
       - name: Build plugin
@@ -68,7 +68,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ide: [PC, PY, IC, IU, GO, CL, RR]
+        ide: [PC, PY]
     steps:
       - name: Free disk space
         uses: jlumbroso/free-disk-space@main
@@ -83,26 +83,55 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v5
         with:
           validate-wrappers: false
-          cache-read-only: true
-      - name: Set up verifier cache
+          cache-read-only: false
+      - name: Cache plugin verifier IDEs
         uses: actions/cache@v5
         with:
-          path: ${{ needs.build.outputs.pluginVerifierHomeDir }}/ides
-          key: plugin-verifier-${{ matrix.ide }}-${{ needs.build.outputs.platformVersion }}
+          path: ~/.pluginVerifier/ides
+          key: plugin-verifier-ides-${{ matrix.ide }}-${{ needs.build.outputs.platformVersion }}
+      - name: Clean corrupted Gradle transforms
+        run: |
+          find ~/.gradle/caches -type d -name "transforms" -exec sh -c '
+            for dir in "$1"/*/; do
+              if [ -d "$dir" ] && [ ! -f "${dir}metadata.bin" ]; then
+                echo "Removing corrupted transform: $dir"
+                rm -rf "$dir"
+              fi
+            done
+          ' _ {} \; 2>/dev/null || true
       - name: Run verification
-        run: ./gradlew verifyPlugin -PverifyIde=${{ matrix.ide }} -Dplugin.verifier.home.dir=${{ needs.build.outputs.pluginVerifierHomeDir }}
+        run: ./gradlew verifyPlugin -PverifyIde=${{ matrix.ide }}
       - name: Collect verification result
         if: ${{ always() }}
         uses: actions/upload-artifact@v6
         with:
           name: pluginVerifier-result-${{ matrix.ide }}
           path: ${{ github.workspace }}/build/reports/pluginVerifier
 
+  lint:
+    name: Lint
+    needs: [build]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout git repository
+        uses: actions/checkout@v6
+      - name: Set up Java
+        uses: actions/setup-java@v5
+        with:
+          distribution: zulu
+          java-version: 21
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v5
+        with:
+          cache-read-only: true
+      - name: Run linter
+        run: ./gradlew ktlintCheck
+
   test:
     name: Run tests
     needs: [build]
@@ -114,19 +143,31 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v5
         with:
           validate-wrappers: false
           cache-read-only: true
-      - name: Run linter
-        run: ./gradlew ktlintCheck
+      - name: Run unit tests
+        run: ./gradlew test
+      - name: Verify 100% coverage
+        run: ./gradlew koverVerify
+      - name: Run UI tests
+        run: |
+          export DISPLAY=:99.0
+          Xvfb :99 -screen 0 1920x1080x24 &
+          ./gradlew runIdeForUiTests &
+          echo "Waiting for IDE to start..."
+          timeout 180 bash -c 'until curl -s http://127.0.0.1:8082 > /dev/null 2>&1; do sleep 2; done' || { echo "IDE failed to start"; exit 1; }
+          echo "IDE is ready"
+          ./gradlew uiTest
+          kill %1 %2 || true
 
   releaseDraft:
     name: Create release draft
     if: github.event_name != 'pull_request'
-    needs: [build, test, verify]
+    needs: [build, lint, test, verify]
     runs-on: ubuntu-latest
     permissions:
       contents: write

.github/workflows/release.yaml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v5
       - name: Extract plugin properties

CONTRIBUTING.md

@@ -0,0 +1,107 @@
+# Contributing to PyVenvManage
+
+## Development Setup
+
+You'll need JDK 21 and Python 3.10+ (for creating test virtual environments). Build the plugin with:
+
+```bash
+./gradlew buildPlugin
+```
+
+## Testing
+
+The project uses two complementary testing strategies: fast unit tests that mock IntelliJ platform dependencies, and
+end-to-end UI tests that interact with a running IDE.
+
+### Unit Tests
+
+Unit tests cover business logic, action update logic, and error paths. They run quickly and don't require a running
+IDE:
+
+```bash
+./gradlew test
+```
+
+### UI Tests
+
+UI tests validate full user workflows by interacting with a running PyCharm instance via RemoteRobot. Start the IDE
+with robot-server in one terminal:
+
+```bash
+./gradlew runIdeForUiTests
+```
+
+Wait for the IDE to fully start and the robot-server to be ready at http://localhost:8082, then run the tests in
+another terminal:
+
+```bash
+./gradlew uiTest
+```
+
+### Coverage
+
+Unit tests achieve full line coverage. The CI enforces this with `./gradlew test koverVerify`. UI tests are excluded
+from coverage collection since they test end-to-end workflows already covered by unit tests.
+
+To generate an HTML coverage report showing overall percentage, package breakdown, and line-by-line highlighting:
+
+```bash
+./gradlew test koverHtmlReport
+open build/reports/kover/html/index.html
+```
+
+For per-test coverage analysis (which test covered which line), generate a binary report with
+`./gradlew test koverBinaryReport`, then in IntelliJ IDEA go to **Run → Show Coverage Data**, click **+**, select
+`build/kover/bin-reports/test.ic`, and click **Show selected**. Right-click any covered line and choose **Show Covering
+Tests** to see which tests hit it.
+
+## Code Quality
+
+Check code style with `./gradlew ktlintCheck` or auto-fix issues with `./gradlew ktlintFormat`. Run all checks together
+(lint, unit tests, coverage verification) with `./gradlew check`.
+
+## Continuous Integration
+
+The CI pipeline in `.github/workflows/check.yaml` builds the plugin, runs linting, executes unit tests with coverage
+verification followed by UI tests, verifies the plugin against PyCharm Community and PyCharm Professional, and creates
+a release draft on the main branch.
+
+The test job runs unit tests with `koverVerify`, then starts Xvfb and the IDE with robot-server, and finally runs UI
+tests for end-to-end validation.
+
+## Making Code Changes
+
+Before committing, run `./gradlew ktlintFormat` to fix style issues, then `./gradlew test koverVerify` to ensure tests
+pass with full coverage. If you modified action classes, run UI tests for end-to-end validation by starting
+`./gradlew runIdeForUiTests` in one terminal and `./gradlew uiTest` in another.
+
+Follow conventional commit style: use `feat:` for new features, `fix:` for bug fixes, `refactor:` for code
+refactoring, `test:` for test changes, `docs:` for documentation, and `chore:` for maintenance tasks.
+
+## Troubleshooting
+
+If UI tests timeout or fail to connect, ensure no other IDE instance is using port 8082. Kill any running IDE processes
+with `pkill -f runIdeForUiTests`, delete old test projects with `rm -rf ~/projects/ui-test*`, then restart the IDE and
+wait for full initialization before running tests.
+
+If `koverVerify` fails due to coverage below 100%, generate the HTML report with `./gradlew koverHtmlReport` and open
+`build/reports/kover/html/index.html` to see which lines are uncovered. Add unit tests for those code paths, or if the
+code requires IntelliJ platform services that can't be mocked, add UI test coverage instead.
+
+## Releasing
+
+The plugin version is defined in `gradle.properties` as `pluginVersion`. To release, update the version in that file
+and merge your PR to main. The CI automatically creates a draft release on GitHub with the version from
+`gradle.properties`.
+
+Review the draft release on the [Releases page](https://github.com/pyvenvmanage/PyVenvManage/releases) and edit the
+release notes if needed. Click "Publish release" (not pre-release) to trigger the release workflow, which builds and
+signs the plugin, publishes to [JetBrains Marketplace](https://plugins.jetbrains.com/plugin/20536-pyvenv-manage-2),
+uploads the plugin ZIP to the GitHub release, and creates a PR to update CHANGELOG.md. Merge that changelog PR after
+the release workflow completes.
+
+The release workflow requires repository secrets configured by maintainers: `PUBLISH_TOKEN` for JetBrains Marketplace
+upload, and `CERTIFICATE_CHAIN`, `PRIVATE_KEY`, and `PRIVATE_KEY_PASSWORD` for plugin signing.
+
+Follow [semantic versioning](https://semver.org/): increment MAJOR for breaking changes, MINOR for new backward
+compatible features, and PATCH for backward compatible bug fixes.

README.md

@@ -19,8 +19,10 @@ streamlines this by enabling quick interpreter selection directly from the proje
 
 - **Quick interpreter switching**: Right-click any virtual environment folder to set it as your project or module
   interpreter instantly
-- **Visual identification**: Virtual environment folders display with a distinctive icon and Python version badge
-  (e.g., `venv [3.11.5]`) in the project view
+- **Visual identification**: Virtual environment folders display with a distinctive icon and customizable decoration
+  (e.g., `.venv [3.11.5 - CPython]`) in the project view
+- **Customizable decorations**: Configure which fields to show (Python version, implementation, system site-packages,
+  creator tool), their order, and the format via Settings
 - **Multi-IDE support**: Works with PyCharm (Community and Professional), IntelliJ IDEA, GoLand, CLion, and RustRover
 - **Smart detection**: Automatically detects Python virtual environments by recognizing `pyvenv.cfg` files
 - **Cached version display**: Python version information is cached for performance and automatically refreshed when
@@ -30,6 +32,8 @@ streamlines this by enabling quick interpreter selection directly from the proje
 
 ## Supported IDEs
 
+Version 2025.1 or later of:
+
 - PyCharm (Community and Professional)
 - IntelliJ IDEA (Community and Ultimate)
 - GoLand
@@ -51,6 +55,20 @@ The official plugin page is at https://plugins.jetbrains.com/plugin/20536-pyvenv
 3. Select **Set as Project Interpreter** or **Set as Module Interpreter**
 4. The interpreter is configured instantly with a confirmation notification
 
+## Settings
+
+Open **Settings** -> **PyVenv Manage** to customize the virtual environment decoration display:
+
+- **Prefix/Suffix**: Characters surrounding the decoration (default: ` [` and `]`)
+- **Separator**: Text between fields (default: `-`)
+- **Fields**: Enable, disable, and reorder which information to display:
+  - Python version (e.g., `3.14.2`)
+  - Python implementation (e.g., `CPython`)
+  - System site-packages indicator (`SYSTEM`)
+  - Virtual environment creator (e.g., `uv@0.9.21`)
+
+A live preview updates as you modify settings.
+
 ## License
 
 This project is licensed under the BSD-3-Clause license - see the