LibJS: Move tests to /Tests/LibJS

Author: https://github.com/gmta
Commit: https://github.com/LadybirdBrowser/ladybird/commit/e3faa9b5add
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7572
Reviewed-by: https://github.com/trflynn89 ✅

Tests/LibJS/Runtime/exponentiation-basic.js

@@ -0,0 +1,77 @@
+test("regular exponentiation", () => {
+    expect(2 ** 0).toBe(1);
+    expect(2 ** 1).toBe(2);
+    expect(2 ** 2).toBe(4);
+    expect(2 ** 3).toBe(8);
+    expect(3 ** 2).toBe(9);
+    expect(0 ** 0).toBe(1);
+    expect(2 ** (3 ** 2)).toBe(512);
+    expect(2 ** (3 ** 2)).toBe(512);
+    expect((2 ** 3) ** 2).toBe(64);
+});
+
+test("exponentiation with negatives", () => {
+    expect(2 ** -3).toBe(0.125);
+    expect((-2) ** 3).toBe(-8);
+
+    expect("-2 ** 3").not.toEval();
+});
+
+test("exponentiation with PlusPlus and MinusMinus", () => {
+    let value = 5;
+    // prettier-ignore
+    expect(++value ** 2).toBe(36);
+
+    value = 5;
+    expect((++value) ** 2).toBe(36);
+
+    value = 5;
+    // prettier-ignore
+    expect(--value ** 2).toBe(16);
+
+    value = 5;
+    expect((--value) ** 2).toBe(16);
+
+    expect("++5 ** 2").not.toEval();
+    expect("--5 ** 2").not.toEval();
+});
+
+test("exponentiation with non-numeric primitives", () => {
+    expect("2" ** "3").toBe(8);
+    expect("" ** []).toBe(1);
+    expect([] ** null).toBe(1);
+    expect(null ** null).toBe(1);
+    expect(undefined ** null).toBe(1);
+});
+
+test("exponentiation that produces NaN", () => {
+    expect(NaN ** 2).toBeNaN();
+    expect(2 ** NaN).toBeNaN();
+    expect(undefined ** 2).toBeNaN();
+    expect(2 ** undefined).toBeNaN();
+    expect(null ** undefined).toBeNaN();
+    expect(2 ** "foo").toBeNaN();
+    expect("foo" ** 2).toBeNaN();
+});
+
+test("exponentiation with infinities", () => {
+    expect((-1) ** Infinity).toBeNaN();
+    expect(0 ** Infinity).toBe(0);
+    expect(1 ** Infinity).toBeNaN();
+    expect((-1) ** -Infinity).toBeNaN();
+    expect(0 ** -Infinity).toBe(Infinity);
+    expect(1 ** -Infinity).toBeNaN();
+    expect(Infinity ** -1).toBe(0);
+    expect(Infinity ** 0).toBe(1);
+    expect(Infinity ** 1).toBe(Infinity);
+    expect((-Infinity) ** -1).toBe(-0);
+    expect((-Infinity) ** 0).toBe(1);
+    expect((-Infinity) ** 1).toBe(-Infinity);
+});
+
+test("unary expression before exponentiation with brackets", () => {
+    expect((!1) ** 2).toBe(0);
+    expect((~5) ** 2).toBe(36);
+    expect((+5) ** 2).toBe(25);
+    expect((-5) ** 2).toBe(25);
+});