1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Number/20.1.3.2-toPrecision.js b/js/src/tests/ecma_6/Number/20.1.3.2-toPrecision.js
new file mode 100644
index 000000000..5c9856044
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+++ b/js/src/tests/ecma_6/Number/20.1.3.2-toPrecision.js
@@ -0,0 +1,47 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+
+var BUGNUMBER = 818617;
+var summary = "ECMAScript 2017 Draft ECMA-262 Section 20.1.3.5: Number.prototype.toPrecision";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+// With NaN, fractionDigits out of range.
+assertEq(Number.prototype.toPrecision.call(NaN, 555), 'NaN');
+
+// With NaN, fractionDigits in range.
+assertEq(Number.prototype.toPrecision.call(NaN, 5), 'NaN');
+
+// With Infinity, fractionDigits out of range.
+assertEq(Number.prototype.toPrecision.call(Infinity, 555), 'Infinity');
+
+// With Infinity, fractionDigits in range.
+assertEq(Number.prototype.toPrecision.call(Infinity, 5), 'Infinity');
+
+// With -Infinity, fractionDigits out of range.
+assertEq(Number.prototype.toPrecision.call(-Infinity, 555), '-Infinity');
+
+// With -Infinity, fractionDigits in range.
+assertEq(Number.prototype.toPrecision.call(-Infinity, 5), '-Infinity');
+
+// With NaN, function assigning a value.
+let x = 10;
+assertEq(Number.prototype.toPrecision.call(NaN, { valueOf() { x = 20; return 1; } }), 'NaN');
+assertEq(x, 20);
+
+// With NaN, function throwing an exception.
+assertThrows(() => Number.prototype.toPrecision.call(NaN, { valueOf() { throw "hello"; } }));
+
+// Not a number throws TypeError
+assertThrowsInstanceOf(() => Number.prototype.toPrecision.call("Hello"), TypeError);
+
+if (typeof reportCompare === "function") {
+  reportCompare(true, true);
+}
+