test: work scheduled in process.nextTick can keep the event loop alive

PR-URL: #43787
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Ujjwal Sharma <[email protected]>

Author: andreubotella

test/parallel/test-process-beforeexit.js

@@ -59,12 +59,21 @@ function tryRepeatedTimer() {
     if (++n < N)
       setTimeout(repeatedTimer, 1);
     else // n == N
-      process.once('beforeExit', common.mustCall(tryNextTick));
+      process.once('beforeExit', common.mustCall(tryNextTickSetImmediate));
   }, N);
   setTimeout(repeatedTimer, 1);
 }
 
 // Test if the callback of `process.nextTick` can be invoked.
+function tryNextTickSetImmediate() {
+  process.nextTick(common.mustCall(function() {
+    setImmediate(common.mustCall(() => {
+      process.once('beforeExit', common.mustCall(tryNextTick));
+    }));
+  }));
+}
+
+// Test that `process.nextTick` won't keep the event loop running by itself.
 function tryNextTick() {
   process.nextTick(common.mustCall(function() {
     process.once('beforeExit', common.mustNotCall());