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test/parallel/test-http2-util-nghttp2error.js

@@ -0,0 +1,22 @@
+// Flags: --expose-internals
+'use strict';
+
+require('../common');
+const { strictEqual, throws } = require('assert');
+const { NghttpError } = require('internal/http2/util');
+
+throws(() => {
+  const err = new NghttpError(-501);
+  strictEqual(err.errno, -501);
+  throw err;
+}, {
+  code: 'ERR_HTTP2_ERROR',
+  constructor: NghttpError,
+  message: 'Invalid argument'
+});
+
+// Should convert the NghttpError object to string properly
+{
+  const err = new NghttpError(401);
+  strictEqual(err.toString(), 'Error [ERR_HTTP2_ERROR]: Unknown error code');
+}