feat: add desktop repo (#1071)

packages/desktop/app/javascripts/Main/Utils/Testing.ts

@@ -0,0 +1,61 @@
+import { app, BrowserWindow } from 'electron'
+import { AppMessageType, MessageType, TestIPCMessage } from '../../../../test/TestIpcMessage'
+import { isTesting } from '../Utils/Utils'
+
+const messageHandlers: {
+  [key in MessageType]?: (...args: any) => unknown
+} = {}
+
+export function handleTestMessage(type: MessageType, handler: (...args: any) => unknown): void {
+  if (!isTesting()) {
+    throw Error('Tried to invoke test handler in non-test build.')
+  }
+
+  messageHandlers[type] = handler
+}
+
+export function send(type: AppMessageType, data?: unknown): void {
+  if (!isTesting()) {
+    return
+  }
+
+  process.send!({ type, data })
+}
+
+export function setupTesting(): void {
+  process.on('message', async (message: TestIPCMessage) => {
+    const handler = messageHandlers[message.type]
+
+    if (!handler) {
+      process.send!({
+        id: message.id,
+        reject: `No handler registered for message type ${MessageType[message.type]}`,
+      })
+      return
+    }
+
+    try {
+      let returnValue = handler(...message.args)
+      if (returnValue instanceof Promise) {
+        returnValue = await returnValue
+      }
+      process.send!({
+        id: message.id,
+        resolve: returnValue,
+      })
+    } catch (error: any) {
+      process.send!({
+        id: message.id,
+        reject: error.toString(),
+      })
+    }
+  })
+
+  handleTestMessage(MessageType.WindowCount, () => BrowserWindow.getAllWindows().length)
+
+  app.on('ready', () => {
+    setTimeout(() => {
+      send(AppMessageType.Ready)
+    }, 200)
+  })
+}