1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Function/prototype/bind/instance-length-tointeger.js b/js/src/tests/test262/built-ins/Function/prototype/bind/instance-length-tointeger.js
new file mode 100644
index 0000000000..3d170b7222
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Function/prototype/bind/instance-length-tointeger.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-function.prototype.bind
+description: >
+  "length" value of a bound function is non-negative integer.
+  ToInteger is performed on "length" value of target function.
+info: |
+  Function.prototype.bind ( thisArg, ...args )
+
+  [...]
+  5. Let targetHasLength be ? HasOwnProperty(Target, "length").
+  6. If targetHasLength is true, then
+    a. Let targetLen be ? Get(Target, "length").
+    b. If Type(targetLen) is Number, then
+       i. If targetLen is +∞𝔽, set L to +∞.
+       ii. Else if targetLen is -∞𝔽, set L to 0.
+       iii. Else,
+            1. Let targetLenAsInt be ! ToIntegerOrInfinity(targetLen).
+            2. Assert: targetLenAsInt is finite.
+            3. Let argCount be the number of elements in args.
+            4. Set L to max(targetLenAsInt - argCount, 0).
+  7. Perform ! SetFunctionLength(F, L).
+  [...]
+
+  ToInteger ( argument )
+
+  1. Let number be ? ToNumber(argument).
+  2. If number is NaN, +0, or -0, return +0.
+  3. If number is +∞ or -∞, return number.
+  4. Let integer be the Number value that is the same sign as number and whose magnitude is floor(abs(number)).
+  5. If integer is -0, return +0.
+  6. Return integer.
+---*/
+
+function fn() {}
+
+Object.defineProperty(fn, "length", {value: NaN});
+assert.sameValue(fn.bind().length, 0);
+
+Object.defineProperty(fn, "length", {value: -0});
+assert.sameValue(fn.bind().length, 0);
+
+Object.defineProperty(fn, "length", {value: Infinity});
+assert.sameValue(fn.bind().length, Infinity, "target length of infinity, zero bound arguments");
+assert.sameValue(fn.bind(0, 0).length, Infinity, "target length of infinity, one bound argument");
+
+Object.defineProperty(fn, "length", {value: -Infinity});
+assert.sameValue(fn.bind().length, 0, "target length of negative infinity, zero bound arguments");
+assert.sameValue(fn.bind(0, 0).length, 0, "target length of negative infinity, one bound argument");
+
+Object.defineProperty(fn, "length", {value: 3.66});
+assert.sameValue(fn.bind().length, 3);
+
+Object.defineProperty(fn, "length", {value: -0.77});
+assert.sameValue(fn.bind().length, 0);
+
+reportCompare(0, 0);