Add tests for <Catalog />, check if emit('catalogAddMenu') when '+' button renders

Signed-off-by: Hung-Han (Henry) Chen <chenhungh@gmail.com>

src/renderer/components/+catalog/catalog.test.tsx

@@ -0,0 +1,110 @@
+/**
+ * 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 { render } from "@testing-library/react";
+import { Catalog } from "./catalog";
+import { createMemoryHistory } from "history";
+import { mockWindow } from "../../../../__mocks__/windowMock";
+import { kubernetesClusterCategory } from "../../../common/catalog-entities/kubernetes-cluster";
+import { catalogCategoryRegistry } from "../../../common/catalog";
+
+mockWindow();
+
+// avoid TypeError: Cannot read property 'getPath' of undefined
+jest.mock("@electron/remote", () => {
+  return {
+    app: {
+      getPath: () => {
+        // avoid TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
+        return "";
+      },
+    },
+  };
+});
+ 
+describe("<Catalog />", () => { 
+  afterEach(() => {
+    jest.restoreAllMocks();
+  });
+ 
+  it("category.emit('catalogAddMenu') when '+' button renders", (done) => {
+    const history = createMemoryHistory();
+    const mockLocation = {
+      pathname: "",
+      search: "",
+      state: "",
+      hash: "",
+    };
+    const mockMatch = {
+      params: {
+        // will be used to match activeCategory
+        // need to be the same as property values in kubernetesClusterCategory
+        group: "entity.k8slens.dev",
+        kind: "KubernetesCluster",
+      },
+      isExact: true,
+      path: "",
+      url: "",
+    };
+
+    let called = 0;
+
+    jest.spyOn(kubernetesClusterCategory, "emit").mockImplementation((event, context) => {
+      // const spy = jest.spyOn(kubernetesClusterCategory, "emit")
+      // expect(spy).toHaveBeenCalledTimes(1);
+      // ^ doesn't work because of using EventEmitter.emit
+      // we have to do this way.
+      called = 1;
+      expect(called).toBe(1);
+      expect(event === "load" || event === "catalogAddMenu").toBeTruthy();
+
+      // only event "catalogAddMenu" has context
+      if (context) {
+        expect(typeof context.navigate).toBe("function");
+        expect(Array.isArray(context.menuItems)).toBeTruthy();
+      }
+
+      if (event === "catalogAddMenu") {
+        done();
+      }
+
+      return true;
+    });
+
+    // mock the return of getting CatalogCategoryRegistry.filteredItems
+    jest
+      .spyOn(catalogCategoryRegistry, "filteredItems", "get")
+      .mockImplementation(() => {
+        return [kubernetesClusterCategory];
+      });
+
+    // we don't care what this.renderList renders in this test case.
+    jest.spyOn(Catalog.prototype, "renderList").mockImplementation(() => {
+      return <span>empty renderList</span>;
+    });
+ 
+    render(
+      <Catalog history={history} location={mockLocation} match={mockMatch} />
+    );
+  });
+});
+