Test ToInteger performed on "length" value of target function

test/built-ins/Function/prototype/bind/instance-length-tointeger.js

@@ -0,0 +1,52 @@
+// 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 not Number, let L be 0.
+    c. Else,
+      i. Set targetLen to ! ToInteger(targetLen).
+      ii. Let L be the larger of 0 and the result of targetLen minus the number of elements of args.
+  7. Else, let L be 0.
+  8. 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);
+
+Object.defineProperty(fn, "length", {value: -Infinity});
+assert.sameValue(fn.bind().length, 0);
+
+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);