Adding RenderDelay tests

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

__mocks__/windowMock.ts

@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+Object.defineProperty(window, "requestIdleCallback", {
+  writable: true,
+  value: jest.fn().mockImplementation(callback => callback()),
+});
+
+Object.defineProperty(window, "cancelIdleCallback", {
+  writable: true,
+  value: jest.fn(),
+});
+
+export default {};

package.json

@@ -63,7 +63,8 @@
     },
     "moduleNameMapper": {
       "\\.(css|scss)$": "<rootDir>/__mocks__/styleMock.ts",
-      "\\.(svg)$": "<rootDir>/__mocks__/imageMock.ts"
+      "\\.(svg)$": "<rootDir>/__mocks__/imageMock.ts",
+      "src/(.*)": "<rootDir>/__mocks__/windowMock.ts"
     },
     "modulePathIgnorePatterns": [
       "<rootDir>/dist",

src/renderer/components/render-delay/__tests__/render-delay.test.tsx

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+import React from "react";
+import "@testing-library/jest-dom/extend-expect";
+import { render } from "@testing-library/react";
+import { RenderDelay } from "../render-delay";
+
+describe("<RenderDelay/>", () => {
+  it("renders w/o errors", () => {
+    const { container } = render(<RenderDelay><button>My button</button></RenderDelay>);
+
+    expect(container).toBeInstanceOf(HTMLElement);
+  });
+
+  it("renders it's child", () => {
+    const { getByText } = render(<RenderDelay><button>My button</button></RenderDelay>);
+
+    expect(getByText("My button")).toBeInTheDocument();
+  });
+});