Try specifying pre-test commands

.github/run-tests.mjs

@@ -0,0 +1,25 @@
+import { readFileSync } from 'node:fs';
+import { execSync } from 'node:child_process';
+
+const exampleDir = process.argv[2];
+
+function runCommand(command) {
+    console.log("::group::" + command)
+    execSync(command, {
+        cwd: exampleDir,
+        stdio: "inherit",
+    });
+    console.log("::endgroup::");
+}
+
+const config = JSON.parse(readFileSync(exampleDir + '/.tbd-example.json', 'utf8'));
+
+runCommand("npm install");
+
+if (config.tests.pre) {
+    for (const cmd of config.tests.pre) {
+        runCommand(cmd);
+    }
+}
+
+runCommand("npm test");

.github/workflows/javascript-tests.yml

@@ -9,33 +9,26 @@ jobs:
       matrix: ${{ steps.build-matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v2
-      - id: build-matrix
-        run: |
-          python -c '
-          import json
-          import os
-          projects = json.dumps([p for p in os.listdir("javascript") if os.path.isfile(f"javascript/{p}/package.json")])
-          print(f"matrix={projects}")
-          ' | tee -a $GITHUB_OUTPUT
+      - name: discover all examples
+        id: build-matrix
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { globSync } = require('node:fs');
+            return globSync("javascript/*/.tbd-example.json").map(path.dirname);
   
   test-javascript:
     needs: list-projects
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        project: ${{ fromJSON(needs.list-projects.outputs.matrix) }}
+        project: ${{ needs.list-projects.outputs.matrix }}
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
           node-version: '20.4.0'
-      - name: Install dependencies
-        run: npm install
-        working-directory: "javascript/${{ matrix.project }}"
-      - name: Install playwright
-        run: npx playwright install --with-deps
-        working-directory: "javascript/${{ matrix.project }}"
       - name: Run tests
-        run: npm run test
-        working-directory: "javascript/${{ matrix.project }}"
+        run: |
+          node .github/run-tests.js ${{ matrix.project }}

javascript/dinger-completed/.tbd-example.json

@@ -0,0 +1,6 @@
+{
+  "name": "Dinger (completed)",
+  "tests": {
+    "pre": ["npx playwright install --with-deps"]
+  }
+}