Expand tests for Math.fround

test/built-ins/Math/fround/Math.fround_Zero.js

@@ -4,7 +4,8 @@
 /*---
 es6id: 20.2.2.17
 author: Ryan Lewis
-description: Math.fround should return 0 if called with 0.
+description: Math.fround should return arg if called with 0 or -0.
 ---*/
 
 assert.sameValue(Math.fround(0), 0, 'Math.fround(0)');
+assert.sameValue(Math.fround(-0), -0, 'Math.fround(-0)');

test/built-ins/Math/fround/value-convertion.js

+// Copyright (C) 2016 The V8 Project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 20.2.2.17
+esid: sec-math.fround
+description: >
+  Convert to binary32 format and than to binary64 format
+info: |
+  Math.fround ( x )
+
+  [...]
+  3. Let x32 be the result of converting x to a value in IEEE 754-2008 binary32
+  format using roundTiesToEven.
+  4. Let x64 be the result of converting x32 to a value in IEEE 754-2008
+  binary64 format.
+  5. Return the ECMAScript Number value corresponding to x64.
+---*/
+
+assert.sameValue(Math.fround(4294967295), 4294967296, "2**32-1");
+assert.sameValue(Math.fround(4294967296), 4294967296, "2**32");
+assert.sameValue(Math.fround(4294967297), 4294967296, "2**32+1");
+
+assert.sameValue(Math.fround(0.1), 0.10000000149011612, "0.1");
+assert.sameValue(Math.fround(0.2), 0.20000000298023224, "0.2");
+assert.sameValue(Math.fround(0.5), 0.5, "0.5");