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test/parallel/test-promises-unhandled-symbol-rejections.js

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+// Flags: --unhandled-rejections=warn
+'use strict';
+const common = require('../common');
+
+const expectedValueWarning = ['Symbol()'];
+const expectedPromiseWarning = ['Unhandled promise rejection. ' +
+  'This error originated either by throwing ' +
+  'inside of an async function without a catch ' +
+  'block, or by rejecting a promise which was ' +
+  'not handled with .catch(). To terminate the ' +
+  'node process on unhandled promise rejection, ' +
+  'use the CLI flag `--unhandled-rejections=strict` (see ' +
+  'https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). ' +
+  '(rejection id: 1)'];
+
+common.expectWarning({
+  UnhandledPromiseRejectionWarning: [
+    expectedValueWarning,
+    expectedPromiseWarning,
+  ],
+});
+
+// Ensure this doesn't crash
+Promise.reject(Symbol());