Reset custom power selector when blurred on empty (#9508)

test/components/views/elements/PowerSelector-test.tsx

@@ -0,0 +1,62 @@
+/*
+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 { fireEvent, render, screen } from "@testing-library/react";
+
+import PowerSelector from "../../../../src/components/views/elements/PowerSelector";
+
+describe('<PowerSelector />', () => {
+    it("should reset back to custom value when custom input is blurred blank", async () => {
+        const fn = jest.fn();
+        render(<PowerSelector value={25} maxValue={100} usersDefault={0} onChange={fn} />);
+
+        const input = screen.getByLabelText("Power level");
+        fireEvent.change(input, { target: { value: "" } });
+        fireEvent.blur(input);
+
+        await screen.findByDisplayValue(25);
+        expect(fn).not.toHaveBeenCalled();
+    });
+
+    it("should reset back to preset value when custom input is blurred blank", async () => {
+        const fn = jest.fn();
+        render(<PowerSelector value={50} maxValue={100} usersDefault={0} onChange={fn} />);
+
+        const select = screen.getByLabelText("Power level");
+        fireEvent.change(select, { target: { value: "SELECT_VALUE_CUSTOM" } });
+
+        const input = screen.getByLabelText("Power level");
+        fireEvent.change(input, { target: { value: "" } });
+        fireEvent.blur(input);
+
+        const option = await screen.findByText<HTMLOptionElement>("Moderator");
+        expect(option.selected).toBeTruthy();
+        expect(fn).not.toHaveBeenCalled();
+    });
+
+    it("should call onChange when custom input is blurred with a number in it", async () => {
+        const fn = jest.fn();
+        render(<PowerSelector value={25} maxValue={100} usersDefault={0} onChange={fn} powerLevelKey="key" />);
+
+        const input = screen.getByLabelText("Power level");
+        fireEvent.change(input, { target: { value: 40 } });
+        fireEvent.blur(input);
+
+        await screen.findByDisplayValue(40);
+        expect(fn).toHaveBeenCalledWith(40, "key");
+    });
+});