LibJS: Implement stringification Temporal.PlainTime prototypes

Author: https://github.com/trflynn89
Commit: ab3c825fa8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2535

Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.toJSON.js

@@ -0,0 +1,18 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Temporal.PlainTime.prototype.toJSON).toHaveLength(0);
+    });
+
+    test("basic functionality", () => {
+        const plainTime = new Temporal.PlainTime(18, 14, 47, 123, 456, 789);
+        expect(plainTime.toJSON()).toBe("18:14:47.123456789");
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainTime object", () => {
+        expect(() => {
+            Temporal.PlainTime.prototype.toJSON.call("foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainTime");
+    });
+});

Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.toLocaleString.js

@@ -0,0 +1,18 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Temporal.PlainTime.prototype.toLocaleString).toHaveLength(0);
+    });
+
+    test("basic functionality", () => {
+        const plainTime = new Temporal.PlainTime(18, 14, 47, 123, 456, 789);
+        expect(plainTime.toLocaleString()).toBe("18:14:47.123456789");
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainTime object", () => {
+        expect(() => {
+            Temporal.PlainTime.prototype.toLocaleString.call("foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainTime");
+    });
+});

Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.toString.js

@@ -0,0 +1,59 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Temporal.PlainTime.prototype.toString).toHaveLength(0);
+    });
+
+    test("basic functionality", () => {
+        const plainTime = new Temporal.PlainTime(18, 14, 47, 123, 456, 789);
+        expect(plainTime.toString()).toBe("18:14:47.123456789");
+    });
+
+    test("fractionalSecondDigits option", () => {
+        const plainTime = new Temporal.PlainTime(18, 14, 47, 123, 456);
+        const values = [
+            ["auto", "18:14:47.123456"],
+            [0, "18:14:47"],
+            [1, "18:14:47.1"],
+            [2, "18:14:47.12"],
+            [3, "18:14:47.123"],
+            [4, "18:14:47.1234"],
+            [5, "18:14:47.12345"],
+            [6, "18:14:47.123456"],
+            [7, "18:14:47.1234560"],
+            [8, "18:14:47.12345600"],
+            [9, "18:14:47.123456000"],
+        ];
+        for (const [fractionalSecondDigits, expected] of values) {
+            const options = { fractionalSecondDigits };
+            expect(plainTime.toString(options)).toBe(expected);
+        }
+
+        // Ignored when smallestUnit is given
+        expect(plainTime.toString({ smallestUnit: "minute", fractionalSecondDigits: 9 })).toBe(
+            "18:14"
+        );
+    });
+
+    test("smallestUnit option", () => {
+        const plainTime = new Temporal.PlainTime(18, 14, 47, 123, 456, 789);
+        const values = [
+            ["minute", "18:14"],
+            ["second", "18:14:47"],
+            ["millisecond", "18:14:47.123"],
+            ["microsecond", "18:14:47.123456"],
+            ["nanosecond", "18:14:47.123456789"],
+        ];
+        for (const [smallestUnit, expected] of values) {
+            const options = { smallestUnit };
+            expect(plainTime.toString(options)).toBe(expected);
+        }
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainTime object", () => {
+        expect(() => {
+            Temporal.PlainTime.prototype.toString.call("foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainTime");
+    });
+});