text: 'use strict';
  
  // Tests to verify doubles are correctly written
  
  const common = 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 (common.isChakraEngine) {
    assert.ok(buffer.equals(new Uint8Array([
      0xFF, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0xFF
    ])));
  } else 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 [ERR_BUFFER_OUT_OF_BOUNDS]',
          message: 'Attempt to write 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 [ERR_OUT_OF_RANGE]',
            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 [ERR_OUT_OF_RANGE]',
            message: 'The value of "offset" is out of range. ' +
                     `It must be an integer. Received ${offset}`
          });
      });
    });
  }
  