From 5e0b880c1adacf0057c7964081552446ea101f33 Mon Sep 17 00:00:00 2001
From: mostafanazari702 <nazarimostafa2006@gmail.com>
Date: Fri, 22 May 2026 21:07:13 +0200
Subject: [PATCH] fix: --fail-zero respects --delay test registration

---
 lib/runner.js                             |  1 +
 test/integration/options/failZero.spec.js | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/lib/runner.js b/lib/runner.js
index dfa5f37375..c3375899bc 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -1223,6 +1223,7 @@ Runner.prototype.run = function (fn, opts = {}) {
     }
     this.state = constants.STATE_RUNNING;
     if (this._opts.delay) {
+      this.total = this.grepTotal(this.suite);
       this.emit(constants.EVENT_DELAY_END);
       debug('run(): "delay" ended');
     }
diff --git a/test/integration/options/failZero.spec.js b/test/integration/options/failZero.spec.js
index 16156b4b12..99478d0eff 100644
--- a/test/integration/options/failZero.spec.js
+++ b/test/integration/options/failZero.spec.js
@@ -1,5 +1,6 @@
 "use strict";
 
+var path = require("node:path").posix;
 var helpers = require("../helpers");
 var runMochaJSON = helpers.runMochaJSON;
 
@@ -19,4 +20,22 @@ describe("--fail-zero", function () {
       done();
     });
   });
+
+  describe("with --delay", function () {
+    it("should pass when delayed tests are registered (GH-4950)", function (done) {
+      var fixture = path.join("options", "delay");
+      runMochaJSON(
+        fixture,
+        ["--fail-zero", "--delay", "--no-forbid-only"],
+        function (err, res) {
+          if (err) {
+            return done(err);
+          }
+
+          expect(res, "to have passed").and("to have passed test count", 1);
+          done();
+        },
+      );
+    });
+  });
 });