test: fix test runner colored output test

Author: MoLow

Diff for: test/fixtures/test-runner/output/arbitrary-output-colored-1.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const test = require('node:test');
+
 console.log({ foo: 'bar' });
 test('passing test', () => {
   console.log(1);

Diff for: test/fixtures/test-runner/output/arbitrary-output-colored.js

@@ -4,8 +4,10 @@ const { once } = require('node:events');
 const { spawn } = require('node:child_process');
 const fixtures = require('../../../common/fixtures');
 
+const env = process.stdout.isTTY ? undefined : { FORCE_COLOR: 1 };
+
 (async function run() {
   const test = fixtures.path('test-runner/output/arbitrary-output-colored-1.js');
-  await once(spawn(process.execPath, ['--test', test], { stdio: 'inherit', env: { FORCE_COLOR: 1 } }), 'exit');
-  await once(spawn(process.execPath, ['--test', '--test-reporter', 'tap', test], { stdio: 'inherit', env: { FORCE_COLOR: 1 }  }), 'exit');
+  await once(spawn(process.execPath, ['--test', test], { stdio: 'inherit', env }), 'exit');
+  await once(spawn(process.execPath, ['--test', '--test-reporter', 'tap', test], { stdio: 'inherit', env  }), 'exit');
 })().then(common.mustCall());