test: simplify test-api-getreport.js

PR-URL: #26169
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/node-report/test-api-getreport.js

@@ -1,25 +1,12 @@
+// Flags: --experimental-report
 'use strict';
-
-// Testcase for returning report as a string via API call
 const common = require('../common');
 common.skipIfReportDisabled();
 const assert = require('assert');
-if (process.argv[2] === 'child') {
-  console.log(process.report.getReport());
-} else {
-  const helper = require('../common/report.js');
-  const spawnSync = require('child_process').spawnSync;
-  const tmpdir = require('../common/tmpdir');
-  tmpdir.refresh();
+const helper = require('../common/report');
 
-  const args = ['--experimental-report', __filename, 'child'];
-  const child = spawnSync(process.execPath, args, { cwd: tmpdir.path });
-  const report_msg = 'Found report files';
-  const std_msg = 'Found messages on stderr';
-  assert.ok(child.stderr.toString().includes(
-    `(node:${child.pid}) ExperimentalWarning: report is an` +
-    ' experimental feature. This feature could change at any time'), std_msg);
-  const reportFiles = helper.findReports(child.pid, tmpdir.path);
-  assert.deepStrictEqual(reportFiles, [], report_msg);
-  helper.validateContent(child.stdout);
-}
+common.expectWarning('ExperimentalWarning',
+                     'report is an experimental feature. This feature could ' +
+                     'change at any time');
+helper.validateContent(process.report.getReport());
+assert.deepStrictEqual(helper.findReports(process.pid, process.cwd()), []);