From b7bfcb4bd274e167626028ebdf81215d220299aa Mon Sep 17 00:00:00 2001
From: Viktor <vic99999@yandex.ru>
Date: Sat, 4 Apr 2015 11:36:57 +0500
Subject: [PATCH] More tests for Math.round

Seems, Math.round(x) is implemented as `Math.floor(x + 0.5)` in some JavaScript engines.
The "Note 2 for Math.round"  was fixed for ES6 (see http://es5.github.io/#x15.8.2.15 and https://people.mozilla.org/~jorendorff/es6-draft.html#sec-math.round )
---
 test/built-ins/Math/round/S15.8.2.15_A7.js | 66 ++++++++++++++++++----
 1 file changed, 55 insertions(+), 11 deletions(-)

diff --git a/test/built-ins/Math/round/S15.8.2.15_A7.js b/test/built-ins/Math/round/S15.8.2.15_A7.js
index 6c2fd38628..cdfbe78312 100644
--- a/test/built-ins/Math/round/S15.8.2.15_A7.js
+++ b/test/built-ins/Math/round/S15.8.2.15_A7.js
@@ -7,24 +7,68 @@ info: >
     Math.round(x) is equal to -0
 es5id: 15.8.2.15_A7
 description: >
-    Checking if Math.round(x) is equal -0, where x is equal to 0,
-    equal to -0.5, or less than -0 while greater than -0.5
+    `Math.round(x)` differs from `Math.floor(x + 0.5)`:
+
+    1) for values in [-0.5; -0]
+    2) for 0.5 - Number.EPSILON / 4
+    3) for odd integers in [-(2 / Number.EPSILON - 1); -(1 / Number.EPSILON + 1)] or in [1 / Number.EPSILON + 1; 2 / Number.EPSILON - 1]
 ---*/
 
 // CHECK#1
-if (Math.round(-0) !== -0)
-{
-	$ERROR("#1: 'Math.round(-0) !== -0'");
+if (1 / Math.round(-0.5) !== 1 / -0) {
+  $ERROR("#1: '1 / Math.round(-0.5) !== 1 / -0'");
 }
 
 // CHECK#2
-if (Math.round(-0.5) !== -0)
-{
-	$ERROR("#2: 'Math.round(-0.5) !== -0'");
+if (1 / Math.round(-0.25) !== 1 / -0) {
+	$ERROR("#2: '1 / Math.round(-0.25) !== 1 / -0'");
 }
 
 // CHECK#3
-if (Math.round(-0.25) !== -0)
-{
-	$ERROR("#3: 'Math.round(-0.25) !== -0'");
+if (1 / Math.round(-0) !== 1 / -0) {
+  $ERROR("#3: '1 / Math.round(-0) !== 1 / -0'");
+}
+
+var x = 0;
+
+// CHECK#4
+x = 0.5 - Number.EPSILON / 4;
+if (1 / Math.round(x) !== 1 / 0) {
+  $ERROR("#4: '1 / Math.round(" + x + ") !== 1 / 0'");
+}
+
+// CHECK#5
+x = -(2 / Number.EPSILON - 1);
+if (Math.round(x) !== x) {
+  $ERROR("#5: 'Math.round(" + x + ") !== " + x + "'");
+}
+
+// CHECK#6
+x = -(1.5 / Number.EPSILON - 1);
+if (Math.round(x) !== x) {
+  $ERROR("#6: 'Math.round(" + x + ") !== " + x + "'");
+}
+
+// CHECK#7
+x = -(1 / Number.EPSILON + 1);
+if (Math.round(x) !== x) {
+  $ERROR("#7: 'Math.round(" + x + ") !== " + x + "'");
+}
+
+// CHECK#8
+x = 1 / Number.EPSILON + 1;
+if (Math.round(x) !== x) {
+  $ERROR("#8: 'Math.round(" + x + ") !== " + x + "'");
+}
+
+// CHECK#9
+x = 1.5 / Number.EPSILON - 1;
+if (Math.round(x) !== x) {
+  $ERROR("#9: 'Math.round(" + x + ") !== " + x + "'");
+}
+
+// CHECK#10
+x = 2 / Number.EPSILON - 1;
+if (Math.round(x) !== x) {
+  $ERROR("#10: 'Math.round(" + x + ") !== " + x + "'");
 }