LibJS: Implement and test ArrayBuffer.prototype.resize

Userland/Libraries/LibJS/Tests/builtins/ArrayBuffer/ArrayBuffer.prototype.resize.js

@@ -0,0 +1,35 @@
+test("length is 1", () => {
+    expect(ArrayBuffer.prototype.resize).toHaveLength(1);
+});
+
+test("resize up to max", () => {
+    let a = new ArrayBuffer(0, { maxByteLength: 10 });
+    a.resize(10);
+    expect(a.byteLength).toEqual(10);
+});
+
+test("resize less than max", () => {
+    let a = new ArrayBuffer(10, { maxByteLength: 10 });
+    a.resize(5);
+    expect(a.byteLength).toEqual(5);
+});
+
+test("resize with negative length", () => {
+    let a = new ArrayBuffer(10, { maxByteLength: 10 });
+    expect(() => {
+        a.resize(-1);
+    }).toThrowWithMessage(
+        RangeError,
+        "New byte length outside range supported by ArrayBuffer instance"
+    );
+});
+
+test("resize past max length", () => {
+    let a = new ArrayBuffer(10, { maxByteLength: 10 });
+    expect(() => {
+        a.resize(11);
+    }).toThrowWithMessage(
+        RangeError,
+        "New byte length outside range supported by ArrayBuffer instance"
+    );
+});