test: add known issues test for debugger heap snapshot race

test/known_issues/test-debugger-takeHeapSnapshot-race.js

@@ -0,0 +1,48 @@
+'use strict';
+const common = require('../common');
+
+// Refs: https://github.com/nodejs/node/issues/39555
+
+// After this issue is fixed, this can perhaps be integrated into
+// test/sequential/test-debugger-heap-profiler.js as it shares almost all
+// the same code.
+
+// These skips should be uncommented once the issue is fixed.
+// common.skipIfInspectorDisabled();
+
+// if (!common.isMainThread) {
+//   common.skip('process.chdir() is not available in workers');
+// }
+
+// This assert.fail() can be removed once the issue is fixed.
+if (!common.hasCrypto || !process.features.inspector) {
+  require('assert').fail('crypto is not available');
+}
+
+const fixtures = require('../common/fixtures');
+const startCLI = require('../common/debugger');
+const tmpdir = require('../common/tmpdir');
+
+tmpdir.refresh();
+process.chdir(tmpdir.path);
+
+const { readFileSync } = require('fs');
+
+const filename = 'node.heapsnapshot';
+
+// Check that two simultaneous snapshots don't step all over each other.
+{
+  const cli = startCLI([fixtures.path('debugger/empty.js')]);
+
+  function onFatal(error) {
+    cli.quit();
+    throw error;
+  }
+
+  return cli.waitForInitialBreak()
+    .then(() => cli.waitForPrompt())
+    .then(() => cli.command('takeHeapSnapshot(); takeHeapSnapshot()'))
+    .then(() => JSON.parse(readFileSync(filename, 'utf8')))
+    .then(() => cli.quit())
+    .then(null, onFatal);
+}