adds missing unit test for UserOnboardingPage component

src/components/views/user-onboarding/UserOnboardingList.tsx

@@ -43,7 +43,7 @@ export function UserOnboardingList({ tasks }: Props) {
     const { completed, waiting, total } = getUserOnboardingCounters(tasks);
 
     return (
-        <div className="mx_UserOnboardingList">
+        <div className="mx_UserOnboardingList" data-testid="user-onboarding-list">
             <div className="mx_UserOnboardingList_header">
                 <Heading size="h3" className="mx_UserOnboardingList_title">
                     {waiting > 0

test/components/views/user-onboarding/UserOnboardingPage-test.tsx

@@ -0,0 +1,101 @@
+/*
+Copyright 2022 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 { act, render, RenderResult } from "@testing-library/react";
+
+import { filterConsole, stubClient } from "../../../test-utils";
+import { UserOnboardingPage } from "../../../../src/components/views/user-onboarding/UserOnboardingPage";
+import { MatrixClientPeg } from "../../../../src/MatrixClientPeg";
+import SdkConfig from "../../../../src/SdkConfig";
+
+jest.mock("../../../../src/components/structures/EmbeddedPage", () => ({
+    __esModule: true,
+    default: jest.fn().mockImplementation(({ url }) => <div>{url}</div>),
+}));
+
+jest.mock("../../../../src/components/structures/HomePage", () => ({
+    __esModule: true,
+    default: jest.fn().mockImplementation(() => <div>home page</div>),
+}));
+
+describe("UserOnboardingPage", () => {
+    let restoreConsole: () => void;
+
+    const renderComponent = async (): Promise<RenderResult> => {
+        const renderResult = render(<UserOnboardingPage />);
+        await act(async () => {
+            jest.runAllTimers();
+        });
+        return renderResult;
+    };
+
+    beforeAll(() => {
+        restoreConsole = filterConsole(
+            // unrelated for this test
+            "could not update user onboarding context",
+        );
+    });
+
+    beforeEach(() => {
+        stubClient();
+        jest.useFakeTimers();
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+    });
+
+    afterAll(() => {
+        restoreConsole();
+    });
+
+    describe("when the user registered before the cutoff date", () => {
+        beforeEach(() => {
+            jest.spyOn(MatrixClientPeg, "userRegisteredAfter").mockReturnValue(false);
+        });
+
+        it("should render the home page", async () => {
+            expect((await renderComponent()).queryByText("home page")).toBeInTheDocument();
+        });
+    });
+
+    describe("when the user registered after the cutoff date", () => {
+        beforeEach(() => {
+            jest.spyOn(MatrixClientPeg, "userRegisteredAfter").mockReturnValue(true);
+        });
+
+        describe("and there is an explicit home page configured", () => {
+            beforeEach(() => {
+                jest.spyOn(SdkConfig, "get").mockReturnValue({
+                    embedded_pages: {
+                        home_url: "https://example.com/home",
+                    },
+                });
+            });
+
+            it("should render the configured page", async () => {
+                expect((await renderComponent()).queryByText("https://example.com/home")).toBeInTheDocument();
+            });
+        });
+
+        describe("and there is no home page configured", () => {
+            it("should render the onboarding", async () => {
+                expect((await renderComponent()).queryByTestId("user-onboarding-list")).toBeInTheDocument();
+            });
+        });
+    });
+});