harness test: nan.js

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

test/harness/nans.js

+// Copyright (C) 2017 Rick Waldron, 2016 the V8 project authors.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: >
+    Including nans.js will expose:
+
+        var distinctNaNs = [
+          0/0, Infinity/Infinity, -(0/0), Math.pow(-1, 0.5), -Math.pow(-1, 0.5)
+        ];
+
+includes: [nans.js]
+---*/
+
+assert.sameValue(isNaN(distinctNaNs[0]), true);
+assert.sameValue(isNaN(distinctNaNs[1]), true);
+assert.sameValue(isNaN(distinctNaNs[2]), true);
+assert.sameValue(isNaN(distinctNaNs[3]), true);
+assert.sameValue(isNaN(distinctNaNs[4]), true);