spec: initial spike of main-process based tests

spec-main/window-helpers.ts

@@ -0,0 +1,26 @@
+import { expect } from 'chai'
+import { BrowserWindow, WebContents } from 'electron'
+import { emittedOnce } from './events-helpers';
+
+export const closeWindow = async (
+  window: BrowserWindow | null = null,
+  { assertNotWindows } = { assertNotWindows: true }
+) => {
+  if (window && !window.isDestroyed()) {
+    const isClosed = emittedOnce(window, 'closed')
+    window.setClosable(true)
+    window.close()
+    await isClosed
+  }
+
+  if (assertNotWindows) {
+    expect(BrowserWindow.getAllWindows()).to.have.lengthOf(0)
+  }
+}
+
+exports.waitForWebContentsToLoad = async (webContents: WebContents) => {
+  const didFinishLoadPromise = emittedOnce(webContents, 'did-finish-load')
+  if (webContents.isLoadingMainFrame()) {
+    await didFinishLoadPromise
+  }
+}