Add CI testing with mocha

.github/workflows/test.yml

@@ -0,0 +1,43 @@
+name: "Tests"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    name: "Unit Tests"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Run tests with coverage
+        if: matrix.node-version == '20.x'
+        run: npm run test:ci
+
+      - name: Upload coverage to Codecov
+        if: matrix.node-version == '20.x'
+        uses: codecov/codecov-action@v4
+        with:
+          files: ./coverage/lcov.info
+          fail_ci_if_error: false
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -17,6 +17,7 @@ yarn-error.log*
 
 # Build output / coverage
 coverage/
+.nyc_output/
 dist/
 build/
 

CLAUDE.md

@@ -15,6 +15,15 @@ This is a Node-RED extension providing custom nodes for interacting with the Seq
 ## Development Commands
 
 ```bash
+# Install dependencies
+npm install
+
+# Run tests
+npm test
+
+# Run tests with coverage
+npm run test:coverage
+
 # Linting (uses pre-commit hooks)
 pre-commit run --all-files
 
@@ -246,6 +255,9 @@ nodes/              - Node implementation files (.js + .html pairs)
   dataset-*.js      - Dataset addition node
   datalink-*.js     - Data Link list/poll nodes
   studios-*.js      - Studio addition/monitor nodes
+test/               - Mocha test files
+  helper.js         - Shared test utilities and mock factories
+  *_spec.js         - Test files for each node
 examples/           - Example flows (.json)
 docker/             - Dockerfiles and Node-RED config for containers
 docs/               - Documentation and images
@@ -263,3 +275,4 @@ docs/               - Documentation and images
 7. Use `node.status()` to update visual state in editor
 8. Register node in [package.json](package.json) under `node-red.nodes`
 9. Create corresponding HTML with `<script type="text/html" data-template-name="...">` for editor UI
+10. Add tests in `test/<node-name>_spec.js` using shared helpers from `test/helper.js`

CONTRIBUTING.md

@@ -86,6 +86,53 @@ After making code changes:
 -   **JavaScript files (`.js`)**: Restart Node-RED
 -   **HTML files (`.html`)**: Refresh your browser (Ctrl+Shift+R / Cmd+Shift+R)
 
+## Running Tests
+
+This project uses [Mocha](https://mochajs.org/) for testing with [node-red-node-test-helper](https://github.com/node-red/node-red-node-test-helper) for Node-RED integration testing.
+
+### Install Dependencies
+
+```bash
+npm install
+```
+
+### Run Tests
+
+```bash
+# Run all tests
+npm test
+
+# Run tests with coverage report
+npm run test:coverage
+
+# Run tests with lcov output (for CI)
+npm run test:ci
+```
+
+### Test Structure
+
+Tests are located in the `test/` directory:
+
+-   `test/helper.js` - Shared test utilities and mock factories
+-   `test/*_spec.js` - Test files for each node (following Node-RED naming convention)
+
+Each test file covers:
+
+-   Node loading and configuration
+-   Input message handling
+-   API call mocking (using [nock](https://github.com/nock/nock))
+-   Output message verification
+-   Error handling
+
+### Writing Tests
+
+When adding new nodes or modifying existing ones, please add or update tests accordingly. Tests should:
+
+1. Use the shared helper functions from `test/helper.js`
+2. Mock all external API calls with nock
+3. Test both success and error paths
+4. Verify message passthrough (custom properties preserved)
+
 ## Docker Development
 
 The project has two Docker images includeed, that bundle and customise a Node-RED installation and come with the Seqera nodes pre-installed.

nodes/datalink-poll.js

@@ -107,15 +107,18 @@ module.exports = function (RED) {
     };
 
     // Start the polling interval
+    let intervalId = null;
     if (node.seqeraConfig && config.dataLinkName && config.dataLinkName.trim() !== "") {
       const intervalMs = node.pollFrequencySec * 1000;
-      const intervalId = setInterval(executePoll, intervalMs);
+      intervalId = setInterval(executePoll, intervalMs);
       // run once immediately
       executePoll();
     }
 
     node.on("close", () => {
-      clearInterval(intervalId);
+      if (intervalId) {
+        clearInterval(intervalId);
+      }
     });
   }