Fix code-server module not being provided in Jest

src/node/plugin.ts

@@ -21,20 +21,22 @@ type Module = any
  */
 const originalLoad = require("module")._load
 require("module")._load = function (request: string, parent: object, isMain: boolean): Module {
-  if (request === "code-server") {
-    return {
-      express,
-      field,
-      HttpCode,
-      HttpError,
-      Level,
-      proxy,
-      replaceTemplates,
-      WsRouter,
-      wss,
-    }
-  }
-  return originalLoad.apply(this, [request, parent, isMain])
+  return request === "code-server" ? codeServer : originalLoad.apply(this, [request, parent, isMain])
+}
+
+/**
+ * The module you get when importing "code-server".
+ */
+export const codeServer = {
+  express,
+  field,
+  HttpCode,
+  HttpError,
+  Level,
+  proxy,
+  replaceTemplates,
+  WsRouter,
+  wss,
 }
 
 interface Plugin extends pluginapi.Plugin {

test/plugin.test.ts

@@ -3,11 +3,14 @@ import * as express from "express"
 import * as fs from "fs"
 import * as path from "path"
 import { HttpCode } from "../src/common/http"
-import { PluginAPI } from "../src/node/plugin"
+import { codeServer, PluginAPI } from "../src/node/plugin"
 import * as apps from "../src/node/routes/apps"
 import * as httpserver from "./httpserver"
 const fsp = fs.promises
 
+// Jest overrides `require` so our usual override doesn't work.
+jest.mock("code-server", () => codeServer)
+
 /**
  * Use $LOG_LEVEL=debug to see debug logs.
  */