1 files changed, 140 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-buffer-writedouble.js b/tests/node_compat/test/parallel/test-buffer-writedouble.js
new file mode 100644
index 000000000..3e4d4e676
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-buffer-writedouble.js
@@ -0,0 +1,140 @@
+// 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';
+
+// Tests to verify doubles are correctly written
+
+require('../common');
+const assert = require('assert');
+
+const buffer = Buffer.allocUnsafe(16);
+
+buffer.writeDoubleBE(2.225073858507201e-308, 0);
+buffer.writeDoubleLE(2.225073858507201e-308, 8);
+assert.ok(buffer.equals(new Uint8Array([
+  0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f, 0x00,
+])));
+
+buffer.writeDoubleBE(1.0000000000000004, 0);
+buffer.writeDoubleLE(1.0000000000000004, 8);
+assert.ok(buffer.equals(new Uint8Array([
+  0x3f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
+  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f,
+])));
+
+buffer.writeDoubleBE(-2, 0);
+buffer.writeDoubleLE(-2, 8);
+assert.ok(buffer.equals(new Uint8Array([
+  0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0,
+])));
+
+buffer.writeDoubleBE(1.7976931348623157e+308, 0);
+buffer.writeDoubleLE(1.7976931348623157e+308, 8);
+assert.ok(buffer.equals(new Uint8Array([
+  0x7f, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0x7f,
+])));
+
+buffer.writeDoubleBE(0 * -1, 0);
+buffer.writeDoubleLE(0 * -1, 8);
+assert.ok(buffer.equals(new Uint8Array([
+  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
+])));
+
+buffer.writeDoubleBE(Infinity, 0);
+buffer.writeDoubleLE(Infinity, 8);
+
+assert.ok(buffer.equals(new Uint8Array([
+  0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x7F,
+])));
+
+assert.strictEqual(buffer.readDoubleBE(0), Infinity);
+assert.strictEqual(buffer.readDoubleLE(8), Infinity);
+
+buffer.writeDoubleBE(-Infinity, 0);
+buffer.writeDoubleLE(-Infinity, 8);
+
+assert.ok(buffer.equals(new Uint8Array([
+  0xFF, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0xFF,
+])));
+
+assert.strictEqual(buffer.readDoubleBE(0), -Infinity);
+assert.strictEqual(buffer.readDoubleLE(8), -Infinity);
+
+buffer.writeDoubleBE(NaN, 0);
+buffer.writeDoubleLE(NaN, 8);
+
+// JS only knows a single NaN but there exist two platform specific
+// implementations. Therefore, allow both quiet and signalling NaNs.
+if (buffer[1] === 0xF7) {
+  assert.ok(buffer.equals(new Uint8Array([
+    0x7F, 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0x7F,
+  ])));
+} else {
+  assert.ok(buffer.equals(new Uint8Array([
+    0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x7F,
+  ])));
+}
+
+assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
+assert.ok(Number.isNaN(buffer.readDoubleLE(8)));
+
+// OOB in writeDouble{LE,BE} should throw.
+{
+  const small = Buffer.allocUnsafe(1);
+
+  ['writeDoubleLE', 'writeDoubleBE'].forEach((fn) => {
+
+    // Verify that default offset works fine.
+    buffer[fn](23, undefined);
+    buffer[fn](23);
+
+    assert.throws(
+      () => small[fn](11.11, 0),
+      {
+        code: 'ERR_BUFFER_OUT_OF_BOUNDS',
+        name: 'RangeError',
+        message: 'Attempt to access memory outside buffer bounds'
+      });
+
+    ['', '0', null, {}, [], () => {}, true, false].forEach((off) => {
+      assert.throws(
+        () => small[fn](23, off),
+        { code: 'ERR_INVALID_ARG_TYPE' });
+    });
+
+    [Infinity, -1, 9].forEach((offset) => {
+      assert.throws(
+        () => buffer[fn](23, offset),
+        {
+          code: 'ERR_OUT_OF_RANGE',
+          name: 'RangeError',
+          message: 'The value of "offset" is out of range. ' +
+                     `It must be >= 0 and <= 8. Received ${offset}`
+        });
+    });
+
+    [NaN, 1.01].forEach((offset) => {
+      assert.throws(
+        () => buffer[fn](42, offset),
+        {
+          code: 'ERR_OUT_OF_RANGE',
+          name: 'RangeError',
+          message: 'The value of "offset" is out of range. ' +
+                   `It must be an integer. Received ${offset}`
+        });
+    });
+  });
+}