chore: add missing integration test prerequisite (#361)

* chore: run build step before `npm run test`

The integration tests require the source to have been built.

The e2e tests do as well, but are already running this in a different way.

There isn't much of a clean separation of the test config by test type, so I decided to keep it
simple by just adding it as a step on a full `npm run test` run. Technically you could still pull
down this repo and start running `vitest` and run into this, but that seems rare enough and I'll
document this prerequisite in my next commit.

* docs(readme): mention prereq for integration tests

See previous commit. Ideally we'd fully automate this but it may not be worth the trouble at the
moment.

Author: serhalp

README.md

@@ -40,6 +40,8 @@ create it. These also run nightly and on release PRs.
 
 ### Integration testing
 
+> **Prerequisite** Run `npm run build` before running integration tests.
+
 How to add new integration test scenarios to the application:
 
 1. Create a new folder under `tests/fixtures/<your-name>`

package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "prepack": "clean-package",
     "postpack": "clean-package restore",
-    "pretest": "node tests/prepare.mjs",
+    "pretest": "npm run build && node tests/prepare.mjs",
     "build": "node ./tools/build.js",
     "build:watch": "node ./tools/build.js --watch",
     "lint": "eslint --cache --format=codeframe --max-warnings=0 --ext .ts,.cts,.js src",