test: migrate event_loop message tests to JS

test/fixtures/event_loop/max_tick_depth.js

@@ -0,0 +1,10 @@
+'use strict';
+require('../../common');
+
+process.maxTickDepth = 10;
+let i = 20;
+process.nextTick(function f() {
+  console.error(`tick ${i}`);
+  if (i-- > 0)
+    process.nextTick(f);
+});

test/fixtures/event_loop/nexttick_throw.js

@@ -0,0 +1,13 @@
+'use strict';
+require('../../common');
+
+process.nextTick(function() {
+  process.nextTick(function() {
+    process.nextTick(function() {
+      process.nextTick(function() {
+        // eslint-disable-next-line no-undef,no-unused-expressions
+        undefined_reference_error_maker;
+      });
+    });
+  });
+});

test/fixtures/event_loop/nexttick_throw.snapshot

@@ -0,0 +1,9 @@
+<project-root>/test/fixtures/event_loop/nexttick_throw.js:7
+        undefined_reference_error_maker;
+        ^
+
+ReferenceError: undefined_reference_error_maker is not defined
+    at <project-root>/test/fixtures/event_loop/nexttick_throw.js:7:3
+    at <node-internal-frames>
+
+Node.js <node-version>

test/parallel/test-node-output-event-loop.mjs

@@ -0,0 +1,19 @@
+import '../common/index.mjs';
+import * as fixtures from '../common/fixtures.mjs';
+import * as snapshot from '../common/assertSnapshot.js';
+import { describe, it } from 'node:test';
+
+describe('event_loop output', { concurrency: !process.env.TEST_PARALLEL }, () => {
+  const tests = [
+    { name: 'event_loop/max_tick_depth.js' },
+    { name: 'event_loop/nexttick_throw.js' },
+  ];
+  for (const { name } of tests) {
+    it(name, async () => {
+      await snapshot.spawnAndAssert(
+        fixtures.path(name),
+        snapshot.defaultTransform,
+      );
+    });
+  }
+});