JSTests/test262/test/built-ins/DataView/prototype/setFloat32/set-values-little-endian-order.js

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-dataview.prototype.setfloat32
description: >
  Set values with little endian order.
info: |
  24.2.4.13 DataView.prototype.setFloat32 ( byteOffset, value [ , littleEndian ] )

  1. Let v be the this value.
  2. If littleEndian is not present, let littleEndian be false.
  3. Return ? SetViewValue(v, byteOffset, littleEndian, "Float32", value).

  24.2.1.2 SetViewValue ( view, requestIndex, isLittleEndian, type, value )

  ...
  15. Let bufferIndex be getIndex + viewOffset.
  16. Return SetValueInBuffer(buffer, bufferIndex, type, numberValue, isLittleEndian).

  24.1.1.6 SetValueInBuffer ( arrayBuffer, byteIndex, type, value [ , isLittleEndian ] )

  ...
  8. If type is "Float32", then
    a. Set rawBytes to a List containing the 4 bytes that are the result of
    converting value to IEEE 754-2008 binary32 format using “Round to nearest,
    ties to even” rounding mode. If isLittleEndian is false, the bytes are
    arranged in big endian order. Otherwise, the bytes are arranged in little
    endian order. If value is NaN, rawValue may be set to any implementation
    chosen IEEE 754-2008 binary32 format Not-a-Number encoding. An
    implementation must always choose the same encoding for each implementation
    distinguishable NaN value.
  ...
  11. Store the individual bytes of rawBytes into block, in order, starting at
  block[byteIndex].
  12. Return NormalCompletion(undefined).
features: [DataView.prototype.getFloat32]
---*/

var buffer = new ArrayBuffer(4);
var sample = new DataView(buffer, 0);

var result;

result = sample.setFloat32(0, 42, true);
assert.sameValue(result, undefined, "returns undefined #1");
assert.sameValue(sample.getFloat32(0), 1.4441781973331565e-41);

result = sample.setFloat32(0, 1.4441781973331565e-41, true);
assert.sameValue(result, undefined, "returns undefined #2");
assert.sameValue(sample.getFloat32(0), 42);