1 files changed, 62 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-buffer-bigint64.js b/tests/node_compat/test/parallel/test-buffer-bigint64.js
new file mode 100644
index 000000000..7aa391f0a
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-buffer-bigint64.js
@@ -0,0 +1,62 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const buf = Buffer.allocUnsafe(8);
+
+['LE', 'BE'].forEach(function(endianness) {
+  // Should allow simple BigInts to be written and read
+  let val = 123456789n;
+  buf[`writeBigInt64${endianness}`](val, 0);
+  let rtn = buf[`readBigInt64${endianness}`](0);
+  assert.strictEqual(val, rtn);
+
+  // Should allow INT64_MAX to be written and read
+  val = 0x7fffffffffffffffn;
+  buf[`writeBigInt64${endianness}`](val, 0);
+  rtn = buf[`readBigInt64${endianness}`](0);
+  assert.strictEqual(val, rtn);
+
+  // Should read and write a negative signed 64-bit integer
+  val = -123456789n;
+  buf[`writeBigInt64${endianness}`](val, 0);
+  assert.strictEqual(val, buf[`readBigInt64${endianness}`](0));
+
+  // Should read and write an unsigned 64-bit integer
+  val = 123456789n;
+  buf[`writeBigUInt64${endianness}`](val, 0);
+  assert.strictEqual(val, buf[`readBigUInt64${endianness}`](0));
+
+  // Should throw a RangeError upon INT64_MAX+1 being written
+  assert.throws(function() {
+    const val = 0x8000000000000000n;
+    buf[`writeBigInt64${endianness}`](val, 0);
+  }, RangeError);
+
+  // Should throw a RangeError upon UINT64_MAX+1 being written
+  assert.throws(function() {
+    const val = 0x10000000000000000n;
+    buf[`writeBigUInt64${endianness}`](val, 0);
+  }, {
+    code: 'ERR_OUT_OF_RANGE',
+    message: 'The value of "value" is out of range. It must be ' +
+      '>= 0n and < 2n ** 64n. Received 18_446_744_073_709_551_616n'
+  });
+
+  // Should throw a TypeError upon invalid input
+  assert.throws(function() {
+    buf[`writeBigInt64${endianness}`]('bad', 0);
+  }, TypeError);
+
+  // Should throw a TypeError upon invalid input
+  assert.throws(function() {
+    buf[`writeBigUInt64${endianness}`]('bad', 0);
+  }, TypeError);
+});