+describe("isArrayIndexString", () => {
+ it("[[Call]] returns false for nonstrings", () => {
+ assertStrictEquals(isArrayIndexString(1), false);
+ });
+
+ it("[[Call]] returns false for noncanonical strings", () => {
+ assertStrictEquals(isArrayIndexString(""), false);
+ assertStrictEquals(isArrayIndexString("01"), false);
+ assertStrictEquals(isArrayIndexString("9007199254740993"), false);
+ });
+
+ it("[[Call]] returns false for nonfinite numbers", () => {
+ assertStrictEquals(isArrayIndexString("NaN"), false);
+ assertStrictEquals(isArrayIndexString("Infinity"), false);
+ assertStrictEquals(isArrayIndexString("-Infinity"), false);
+ });
+
+ it("[[Call]] returns false for negative numbers", () => {
+ assertStrictEquals(isArrayIndexString("-0"), false);
+ assertStrictEquals(isArrayIndexString("-1"), false);
+ });
+
+ it("[[Call]] returns false for nonintegers", () => {
+ assertStrictEquals(isArrayIndexString("0.25"), false);
+ assertStrictEquals(isArrayIndexString("1.1"), false);
+ });
+
+ it("[[Call]] returns false for numbers greater than or equal to -1 >>> 0", () => {
+ assertStrictEquals(isArrayIndexString(String(-1 >>> 0)), false);
+ assertStrictEquals(
+ isArrayIndexString(String((-1 >>> 0) + 1)),
+ false,
+ );
+ });
+
+ it("[[Call]] returns true for array lengths less than -1 >>> 0", () => {
+ assertStrictEquals(isArrayIndexString("0"), true);
+ assertStrictEquals(
+ isArrayIndexString(String((-1 >>> 0) - 1)),
+ true,
+ );
+ });
+
+ it("[[Construct]] throws an error", () => {
+ assertThrows(() => new isArrayIndexString("0"));
+ });
+
+ describe(".length", () => {
+ it("[[Get]] returns the correct length", () => {
+ assertStrictEquals(isArrayIndexString.length, 1);
+ });
+ });
+
+ describe(".name", () => {
+ it("[[Get]] returns the correct name", () => {
+ assertStrictEquals(
+ isArrayIndexString.name,
+ "isArrayIndexString",
+ );
+ });
+ });
+});
+