Update tests for Math.{sign,sin,trunc}

test/built-ins/Math/sign/sign-specialVals.js

@@ -2,13 +2,19 @@
 // This code is governed by the license found in the LICENSE file.
 
 /*---
-description: Math.sign with special values
+description: >
+  Returns the sign of the x, indicating whether x is positive, negative or zero.
 es6id: 20.2.2.29
 ---*/
 
-assert.sameValue(Math.sign(NaN), Number.NaN,
-    "Math.sign produces incorrect output for NaN");
-assert.sameValue(1/Math.sign(-0), Number.NEGATIVE_INFINITY,
-    "Math.sign produces incorrect output for -0");
-assert.sameValue(1/Math.sign(0), Number.POSITIVE_INFINITY,
-    "Math.sign produces incorrect output for 0");
+assert.sameValue(Math.sign(NaN), NaN, "NaN");
+assert.sameValue(Math.sign(-0), -0, "-0");
+assert.sameValue(Math.sign(0), 0, "0");
+
+assert.sameValue(Math.sign(-0.000001), -1, "-0.000001");
+assert.sameValue(Math.sign(-1), -1, "-1");
+assert.sameValue(Math.sign(-Infinity), -1, "-Infinity");
+
+assert.sameValue(Math.sign(0.000001), 1, "0.000001");
+assert.sameValue(Math.sign(1), 1, "1");
+assert.sameValue(Math.sign(Infinity), 1, "Infinity");

test/built-ins/Math/sin/zero.js

@@ -2,9 +2,9 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-info: If x is -0, Math.sin(x) is -0
 es5id: 15.8.2.16_A3
-description: Checking if Math.sin(-0) equals to -0
+description: Return arg if -0 or +0
 ---*/
 
-assert.sameValue(Math.sin(-0), -0);
+assert.sameValue(Math.sin(0), 0, "+0");
+assert.sameValue(Math.sin(-0), -0, "-0");

test/built-ins/Math/trunc/Math.trunc_Infinity.js

@@ -4,7 +4,8 @@
 /*---
 es6id: 20.2.2.35
 author: Ryan Lewis
-description: Math.trunc should return Infinity when called with Infinity.
+description: Return arg when called with Infinity or -Infinity.
 ---*/
 
-assert.sameValue(Math.trunc(.9), 0, 'Math.trunc(.9)');
+assert.sameValue(Math.trunc(Infinity), Infinity, 'Math.trunc(Infinity)');
+assert.sameValue(Math.trunc(-Infinity), -Infinity, 'Math.trunc(-Infinity)');