fix: guard sort() with shuffle check so --shuffle is not silently ignored

sort() added in #5438 was unconditional — it ran after loadTests() applied
shuffle(), overwriting the randomised order every time. Guard the sort
with !this.opts.shuffle so alphabetical order is used for normal runs
and the shuffled order is preserved when --shuffle is requested.

Fixes #5605

Author: kapilvus

lib/codecept.js

@@ -289,8 +289,11 @@ class Codecept {
       // Ignore if gherkin module not available
     }
 
-    // Sort test files alphabetically for consistent execution order
-    this.testFiles.sort()
+    // Sort test files alphabetically for consistent execution order,
+    // but skip sorting when --shuffle is active so the randomised order is preserved.
+    if (!this.opts.shuffle) {
+      this.testFiles.sort()
+    }
 
     return new Promise((resolve, reject) => {
       const mocha = container.mocha()