test: add test for env integration

[climba03003]

Resolve #102
I do not know if it is the right approach for testing ts-node and ts-node-dev integration. But I think it is the only way to see if it is working properly.

The two test case increase the test time from 1S to 8S and I think it is not worth for such two test case.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

are those needed to be jest-tests? I think these can get better with tap (as they'd run in parallel). I would also recommend using spawn instead of spawnSync and keep things asynchronous.

[climba03003]

are those needed to be jest-tests? I think these can get better with tap (as they'd run in parallel). I would also recommend using spawn instead of spawnSync and keep things asynchronous.

I can use tap for the ts-node test.
however, ts-node-dev always error when using tap

test/typescript/integration.ts 1>     Ignore watch: []
test/typescript/integration.ts 1>     [INFO] 22:32:09 ts-node-dev ver. 1.1.1 (using ts-node ver. 9.1.1, typescript ver. 3.9.7)
test/typescript/integration.ts 1>     [DEBUG] 22:32:09 Starting child process -r /tmp/ts-node-dev-hook-060858551201929734.js /fastify-autoload/node_modules/ts-node-dev/lib/wrap.js /fastify-autoload/test/typescript/basic/ts-node-dev.ts
test/typescript/integration.ts 1>     [DEBUG] 22:32:09 /fastify-autoload/test/typescript/basic/ts-node-dev.ts added to watcher
test/typescript/integration.ts 1>     [DEBUG] 22:32:11 /fastify-autoload/test/typescript/basic/ts-node-dev.ts compiled in 1595 ms
test/typescript/integration.ts 2> RangeError: Maximum call stack size exceeded
test/typescript/integration.ts 2>     at stringify (<anonymous>)
test/typescript/integration.ts 2>     at writeChannelMessage (internal/child_process/serialization.js:117:20)
test/typescript/integration.ts 2>     at process.target._send (internal/child_process.js:804:17)
test/typescript/integration.ts 2>     at process.target.send (internal/child_process.js:702:19)
test/typescript/integration.ts 2>     at Object.exports.send (/fastify-autoload/node_modules/ts-node-dev/lib/ipc.js:17:14)
test/typescript/integration.ts 2>     at /fastify-autoload/node_modules/ts-node-dev/lib/wrap.js:88:9
test/typescript/integration.ts 2>     at nodeDevHook (/fastify-autoload/node_modules/ts-node-dev/lib/hook.js:61:17)
test/typescript/integration.ts 2>     at /fastify-autoload/node_modules/append-transform/index.js:62:4
test/typescript/integration.ts 2>     at nodeDevHook (/fastify-autoload/node_modules/ts-node-dev/lib/hook.js:63:13)
test/typescript/integration.ts 2>     at /fastify-autoload/node_modules/append-transform/index.js:62:4
test/typescript/integration.ts 1>     [DEBUG] 22:32:11 Child error
test/typescript/integration.ts 1>     [ERROR] 22:32:11 RangeError: Maximum call stack size exceeded
test/typescript/integration.ts 1>     [DEBUG] 22:32:11 Disconnecting from child
test/typescript/integration.ts 1>     [DEBUG] 22:32:11 Sending SIGTERM kill to child pid 18281
test/typescript/integration.ts 1>     [DEBUG] 22:32:11 Child exited with code 0

[mcollina]

lgtm

[climba03003]

this PR is ignored in space.

[mcollina]

Sorry for the delay, I hoped somebody else would take a look