LibJS: Implement Date.prototype.setUTCHours

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setUTCHours.js

@@ -0,0 +1,65 @@
+describe("errors", () => {
+    test("called on non-Date object", () => {
+        expect(() => {
+            Date.prototype.setUTCHours();
+        }).toThrowWithMessage(TypeError, "Not an object of type Date");
+    });
+
+    test("called with non-numeric parameters", () => {
+        expect(() => {
+            new Date().setUTCHours(Symbol.hasInstance);
+        }).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
+
+        expect(() => {
+            new Date().setUTCHours(8, Symbol.hasInstance);
+        }).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
+
+        expect(() => {
+            new Date().setUTCHours(8, 9, Symbol.hasInstance);
+        }).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
+
+        expect(() => {
+            new Date().setUTCHours(8, 9, 10, Symbol.hasInstance);
+        }).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
+    });
+});
+
+describe("correct behavior", () => {
+    const d = new Date(2000, 2, 1);
+
+    test("basic functionality", () => {
+        d.setUTCHours(8);
+        expect(d.getUTCHours()).toBe(8);
+
+        d.setUTCHours(9, 15);
+        expect(d.getUTCHours()).toBe(9);
+        expect(d.getUTCMinutes()).toBe(15);
+
+        d.setUTCHours(10, 25, 35);
+        expect(d.getUTCHours()).toBe(10);
+        expect(d.getUTCMinutes()).toBe(25);
+        expect(d.getUTCSeconds()).toBe(35);
+
+        d.setUTCHours(11, 35, 45, 789);
+        expect(d.getUTCHours()).toBe(11);
+        expect(d.getUTCMinutes()).toBe(35);
+        expect(d.getUTCSeconds()).toBe(45);
+        expect(d.getUTCMilliseconds()).toBe(789);
+
+        d.setUTCHours("");
+        expect(d.getUTCHours()).toBe(0);
+
+        d.setUTCHours("a");
+        expect(d.getUTCHours()).toBe(NaN);
+    });
+
+    test("NaN", () => {
+        d.setUTCHours(NaN);
+        expect(d.getUTCHours()).toBeNaN();
+    });
+
+    test("time clip", () => {
+        d.setUTCHours(8.65e15);
+        expect(d.getUTCHours()).toBeNaN();
+    });
+});