test: Type-check test files.

Closes https://github.com/solid/community-server/issues/415

.github/workflows/ci.yml

@@ -43,6 +43,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
       - run: npm ci
       - run: npm run validate
+      - run: npm run test:tsc
       - run: npm run test:unit
       - name: Coveralls
         uses: coverallsapp/github-action@master

package.json

@@ -50,8 +50,9 @@
     "lint": "eslint . --ext .ts --cache",
     "prepare": "npm run build",
     "start": "node ./bin/server.js -p 3000",
-    "test": "npm run jest",
+    "test": "npm run test:tsc && npm run jest",
     "test:deploy": "test/deploy/validate-package.sh",
+    "test:tsc": "tsc -p test --noEmit",
     "test:integration": "jest --coverageThreshold '{}' test/integration",
     "test:unit": "jest test/unit",
     "validate": "componentsjs-compile-config urn:solid-server:default:Initializer -c config/config-default.json -f > /dev/null",

test/tsconfig.json

@@ -1,6 +1,9 @@
 {
   "compilerOptions": {
+    "module": "commonjs",
+    "target": "es2017",
     "esModuleInterop": true,
+    "incremental": true,
     "noUnusedLocals": true,
     "strict": true
   }