feat: allow runInBackground reuse on plugins (#2872)

see eggjs/egg-mock#78

app/extend/context.js

@@ -198,13 +198,22 @@ const proto = module.exports = {
    * ```
    */
   runInBackground(scope) {
+    // try to use custom function name first
+    /* istanbul ignore next */
+    const taskName = scope._name || scope.name || eggUtils.getCalleeFromStack(true);
+    scope._name = taskName;
+    this._runInBackground(scope);
+  },
+
+  // let plugins or frameworks to reuse _runInBackground in some cases.
+  // e.g.: https://github.com/eggjs/egg-mock/pull/78
+  _runInBackground(scope) {
     const ctx = this;
     const start = Date.now();
-    // try to use custom function name first
     /* istanbul ignore next */
     const taskName = scope._name || scope.name || eggUtils.getCalleeFromStack(true);
     // use app.toAsyncFunction to support both generator function and async function
-    ctx.app.toAsyncFunction(scope)(ctx)
+    return ctx.app.toAsyncFunction(scope)(ctx)
       .then(() => {
         ctx.coreLogger.info('[egg:background] task:%s success (%dms)', taskName, Date.now() - start);
       })

package.json

@@ -94,10 +94,10 @@
   ],
   "scripts": {
     "lint": "eslint app config lib test *.js",
-    "test": "npm run lint -- --fix && npm run test-local",
+    "test": "npm run lint -- --fix && egg-bin pkgfiles && npm run test-local",
     "test-local": "egg-bin test",
     "cov": "egg-bin cov --timeout 100000",
-    "ci": "npm run lint && npm run cov",
+    "ci": "npm run lint && egg-bin pkgfiles --check && npm run cov",
     "doc-server": "doctools server",
     "doc-build": "doctools build",
     "doc-deploy": "doctools deploy",