Add unit tests for main

Adds a unit test for the restart event.

src/lib/__mocks__/mainEvent.js

@@ -0,0 +1,12 @@
+let handlers = new Map();
+
+const mainEvent = {
+  on(event, handler) {
+    handlers.set(event, handler);
+  },
+  emit(event) {
+    handlers.get(event)();
+  }
+};
+
+module.exports = mainEvent;

src/main.spec.js

@@ -3,7 +3,27 @@ process.argv = [null, null, "-vv"];
 const { ipcMain } = require("electron");
 jest.mock("electron");
 process.argv = [];
+const mainEvent = require("./lib/mainEvent.js");
+jest.mock("./lib/mainEvent.js");
+const { main } = require("./main.js");
+const window = require("./lib/window.js");
+jest.mock("./lib/window.js");
+const core = require("./core/core.js");
+jest.mock("./core/core.js");
 
 it("should be a singleton", () => {
   expect(require("./main.js")).toBeDefined();
 });
+
+describe("main", () => {
+  describe("restart", () => {
+    it("should restart the app", () => {
+      mainEvent.emit("restart");
+      expect(window.send).toHaveBeenCalledWith("user:restart");
+      expect(window.send).toHaveBeenCalledTimes(1);
+      expect(core.reset).toHaveBeenCalledTimes(1);
+      expect(core.prepare).toHaveBeenCalledTimes(1);
+      expect(core.prepare).toHaveBeenCalledWith(undefined, true);
+    });
+  });
+});