LibJS: Implement Atomics.store

Userland/Libraries/LibJS/Tests/builtins/Atomics/Atomics.store.js

@@ -0,0 +1,60 @@
+test("invariants", () => {
+    expect(Atomics.store).toHaveLength(3);
+});
+
+test("error cases", () => {
+    expect(() => {
+        Atomics.store("not an array", 0);
+    }).toThrow(TypeError);
+
+    expect(() => {
+        const bad_array_type = new Float32Array(4);
+        Atomics.store(bad_array_type, 0);
+    }).toThrow(TypeError);
+
+    expect(() => {
+        const bad_array_type = new Uint8ClampedArray(4);
+        Atomics.store(bad_array_type, 0);
+    }).toThrow(TypeError);
+
+    expect(() => {
+        const array = new Int32Array(4);
+        Atomics.store(array, 100);
+    }).toThrow(RangeError);
+});
+
+test("basic functionality (non-BigInt)", () => {
+    [Int8Array, Int16Array, Int32Array, Uint8Array, Uint16Array, Uint32Array].forEach(ArrayType => {
+        const array = new ArrayType(4);
+
+        expect(Atomics.store(array, 0, 1)).toBe(1);
+        expect(array[0]).toBe(1);
+
+        expect(Atomics.store(array, 1, 2)).toBe(2);
+        expect(array[1]).toBe(2);
+
+        expect(Atomics.store(array, 2, 3)).toBe(3);
+        expect(array[2]).toBe(3);
+
+        expect(Atomics.store(array, 3, 4)).toBe(4);
+        expect(array[3]).toBe(4);
+    });
+});
+
+test("basic functionality (BigInt)", () => {
+    [BigInt64Array, BigUint64Array].forEach(ArrayType => {
+        const array = new ArrayType(4);
+
+        expect(Atomics.store(array, 0, 1n)).toBe(1n);
+        expect(array[0]).toBe(1n);
+
+        expect(Atomics.store(array, 1, 2n)).toBe(2n);
+        expect(array[1]).toBe(2n);
+
+        expect(Atomics.store(array, 2, 3n)).toBe(3n);
+        expect(array[2]).toBe(3n);
+
+        expect(Atomics.store(array, 3, 4n)).toBe(4n);
+        expect(array[3]).toBe(4n);
+    });
+});