element-web/test/utils/FormattingUtils-test.tsx

/*
Copyright 2023 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React from "react";

import { formatList, formatCount, formatCountLong } from "../../src/utils/FormattingUtils";
import SettingsStore from "../../src/settings/SettingsStore";

jest.mock("../../src/dispatcher/dispatcher");

describe("FormattingUtils", () => {
    describe("formatCount", () => {
        it.each([
            { count: 999, expectedCount: "999" },
            { count: 9999, expectedCount: "10K" },
            { count: 99999, expectedCount: "100K" },
            { count: 999999, expectedCount: "1M" },
            { count: 9999999, expectedCount: "10M" },
            { count: 99999999, expectedCount: "100M" },
            { count: 999999999, expectedCount: "1B" },
            { count: 9999999999, expectedCount: "10B" },
        ])("formats $count as $expectedCount", ({ count, expectedCount }) => {
            expect(formatCount(count)).toBe(expectedCount);
        });
    });

    describe("formatCountLong", () => {
        it("formats numbers according to the locale", () => {
            expect(formatCountLong(1000)).toBe("1,000");
        });
    });

    describe("formatList", () => {
        beforeEach(() => {
            jest.resetAllMocks();
            jest.spyOn(SettingsStore, "getValue").mockReturnValue("en-GB");
        });

        it("should return empty string when given empty list", () => {
            expect(formatList([])).toEqual("");
        });

        it("should return only item when given list of length 1", () => {
            expect(formatList(["abc"])).toEqual("abc");
        });

        it("should return expected sentence in English without item limit", () => {
            expect(formatList(["abc", "def", "ghi"])).toEqual("abc, def and ghi");
        });

        it("should return expected sentence in German without item limit", () => {
            jest.spyOn(SettingsStore, "getValue").mockReturnValue("de");
            expect(formatList(["abc", "def", "ghi"])).toEqual("abc, def und ghi");
        });

        it("should return expected sentence in English with item limit", () => {
            expect(formatList(["abc", "def", "ghi", "jkl"], 2)).toEqual("abc, def and 2 others");
            expect(formatList(["abc", "def", "ghi", "jkl"], 3)).toEqual("abc, def, ghi and one other");
        });

        it("should return expected sentence in English with item limit and includeCount", () => {
            expect(formatList(["abc", "def", "ghi", "jkl"], 3, true)).toEqual("abc, def and 2 others");
            expect(formatList(["abc", "def", "ghi", "jkl"], 4, true)).toEqual("abc, def, ghi and jkl");
        });

        it("should return expected sentence in ReactNode when given 2 React children", () => {
            expect(formatList([<span key="a">a</span>, <span key="b">b</span>])).toMatchSnapshot();
        });

        it("should return expected sentence in ReactNode when given more React children", () => {
            expect(
                formatList([
                    <span key="a">a</span>,
                    <span key="b">b</span>,
                    <span key="c">c</span>,
                    <span key="d">d</span>,
                ]),
            ).toMatchSnapshot();
        });

        it("should return expected sentence in ReactNode when using itemLimit", () => {
            expect(
                formatList(
                    [<span key="a">a</span>, <span key="b">b</span>, <span key="c">c</span>, <span key="d">d</span>],
                    2,
                ),
            ).toMatchSnapshot();
        });
    });
});