test: improve UV_THREADPOOL_SIZE tests on .env

Author: anonrig

test/fixtures/dotenv/node-options.env

@@ -2,4 +2,3 @@ CUSTOM_VARIABLE=hello-world
 NODE_NO_WARNINGS=1
 NODE_OPTIONS="--experimental-permission --allow-fs-read=*"
 TZ=Pacific/Honolulu
-UV_THREADPOOL_SIZE=5

test/fixtures/dotenv/uv-threadpool.env

@@ -0,0 +1 @@
+UV_THREADPOOL_SIZE=5

test/parallel/test-dotenv-node-options.js

@@ -8,7 +8,8 @@ if (process.config.variables.node_without_node_options) {
   common.skip('missing NODE_OPTIONS support');
 }
 
-const relativePath = '../fixtures/dotenv/node-options.env';
+const nodeOptionsPath = '../fixtures/dotenv/node-options.env';
+const uvThreadPoolPath = '../fixtures/dotenv/uv-threadpool.env';
 
 describe('.env supports NODE_OPTIONS', () => {
 
@@ -18,7 +19,7 @@ describe('.env supports NODE_OPTIONS', () => {
     `.trim();
     const child = await common.spawnPromisified(
       process.execPath,
-      [ `--env-file=${relativePath}`, '--eval', code ],
+      [ `--env-file=${nodeOptionsPath}`, '--eval', code ],
       { cwd: __dirname },
     );
     // NODE_NO_WARNINGS is set, so `stderr` should not contain
@@ -35,7 +36,7 @@ describe('.env supports NODE_OPTIONS', () => {
     `.trim();
     const child = await common.spawnPromisified(
       process.execPath,
-      [ `--env-file=${relativePath}`, '--eval', code ],
+      [ `--env-file=${nodeOptionsPath}`, '--eval', code ],
       { cwd: __dirname },
     );
     assert.match(child.stderr, /Error: Access to this API has been restricted/);
@@ -50,7 +51,7 @@ describe('.env supports NODE_OPTIONS', () => {
     `.trim();
     const child = await common.spawnPromisified(
       process.execPath,
-      [ `--env-file=${relativePath}`, '--eval', code ],
+      [ `--env-file=${nodeOptionsPath}`, '--eval', code ],
       { cwd: __dirname },
     );
     assert.strictEqual(child.stderr, '');
@@ -59,11 +60,13 @@ describe('.env supports NODE_OPTIONS', () => {
 
   it('should update UV_THREADPOOL_SIZE', async () => {
     const code = `
-      require('assert').strictEqual(process.env.UV_THREADPOOL_SIZE, '5')
+      const { test } = require('../node-api/test_uv_threadpool_size/build/${common.buildType}/test_uv_threadpool_size');
+      const size = parseInt(process.env.UV_THREADPOOL_SIZE || 4, 10);
+      test(size);
     `.trim();
     const child = await common.spawnPromisified(
       process.execPath,
-      [ `--env-file=${relativePath}`, '--eval', code ],
+      [ `--env-file=${uvThreadPoolPath}`, '--eval', code ],
       { cwd: __dirname },
     );
     assert.strictEqual(child.stderr, '');