fix(node/assert): Enable test-assert-fail.js and align fail to it

node/_tools/config.json

@@ -8,6 +8,7 @@
   "tests": {
     "parallel": [
       "test-assert.js",
+      "test-assert-fail.js",
       "test-event-emitter-listener-count.js"
     ]
   },

node/_tools/suites/parallel/test-assert-fail.js

@@ -0,0 +1,47 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 15.5.1
+// This file is automatically generated by "node/_tools/setup.ts". Do not modify this file manually
+
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+// No args
+assert.throws(
+  () => { assert.fail(); },
+  {
+    code: 'ERR_ASSERTION',
+    name: 'AssertionError',
+    message: 'Failed',
+    operator: 'fail',
+    actual: undefined,
+    expected: undefined,
+    generatedMessage: true,
+    stack: /Failed/
+  }
+);
+
+// One arg = message
+assert.throws(() => {
+  assert.fail('custom message');
+}, {
+  code: 'ERR_ASSERTION',
+  name: 'AssertionError',
+  message: 'custom message',
+  operator: 'fail',
+  actual: undefined,
+  expected: undefined,
+  generatedMessage: false
+});
+
+// One arg = Error
+assert.throws(() => {
+  assert.fail(new TypeError('custom message'));
+}, {
+  name: 'TypeError',
+  message: 'custom message'
+});

node/assert.ts

@@ -492,8 +492,20 @@ function notDeepStrictEqual(
   );
 }
 
-function fail() {
-  toNode(() => fail());
+function fail(message?: string | Error): never {
+  if (typeof message === "string" || message == null) {
+    const err = new AssertionError({
+      message: message ?? "Failed",
+      operator: "fail",
+    });
+    if (message == null) {
+      // When the default error message (`"Failed"`) is used, `generatedMessage` should be set to `true`.
+      err.generatedMessage = true;
+    }
+    throw err;
+  } else {
+    throw message;
+  }
 }
 function match(actual: string, regexp: RegExp, message?: string | Error) {
   if (arguments.length < 2) {