test: improve console tests

PR-URL: #17708
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>

test/parallel/test-console-assign-undefined.js

@@ -1,27 +1,31 @@
 'use strict';
 
-// Should be above require, because code in require read console
-// what we are trying to avoid
-// set should be earlier than get
+// Patch global.console before importing modules that may modify the console
+// object.
 
-global.console = undefined;
+const tmp = global.console;
+global.console = 42;
 
-// Initially, the `console` variable is `undefined`, since console will be
-// lazily loaded in the getter.
-
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 
-// global.console's getter is called
-// Since the `console` cache variable is `undefined` and therefore false-y,
-// the getter still calls NativeModule.require() and returns the object
-// obtained from it, instead of returning `undefined` as expected.
+// Originally the console had a getter. Test twice to verify it had no side
+// effect.
+assert.strictEqual(global.console, 42);
+assert.strictEqual(global.console, 42);
 
-assert.strictEqual(global.console, undefined, 'first read');
-assert.strictEqual(global.console, undefined, 'second read');
+common.expectsError(
+  () => console.log('foo'),
+  {
+    type: TypeError,
+    message: 'console.log is not a function'
+  }
+);
 
 global.console = 1;
-assert.strictEqual(global.console, 1, 'set true-like primitive');
+assert.strictEqual(global.console, 1);
+assert.strictEqual(console, 1);
 
-global.console = 0;
-assert.strictEqual(global.console, 0, 'set false-like primitive, again');
+// Reset the console
+global.console = tmp;
+console.log('foo');

test/parallel/test-console-is-a-namespace.js

@@ -12,8 +12,9 @@ assert.doesNotThrow(() => {
 
 const self = global;
 
-/* eslint-disable */
-/* The following tests are copied from */
+/* eslint-disable quotes, max-len */
+
+/* The following tests should not be modified as they are copied */
 /* WPT Refs:
    https://github.com/w3c/web-platform-tests/blob/40e451c/console/console-is-a-namespace.any.js
    License: http://www.w3.org/Consortium/Legal/2008/04-testsuite-copyright.html
@@ -38,12 +39,14 @@ test(() => {
   assert_false("Console" in self);
 }, "Console (uppercase, as if it were an interface) must not exist");
 
+test(() => {
+  const prototype1 = Object.getPrototypeOf(console);
+  const prototype2 = Object.getPrototypeOf(prototype1);
 
-// test(() => {
-//   const prototype1 = Object.getPrototypeOf(console);
-//   const prototype2 = Object.getPrototypeOf(prototype1);
+  // This got commented out from the original test because in Node.js all
+  // functions are declared on the prototype.
+  // assert_equals(Object.getOwnPropertyNames(prototype1).length, 0, "The [[Prototype]] must have no properties");
+  assert_equals(prototype2, Object.prototype, "The [[Prototype]]'s [[Prototype]] must be %ObjectPrototype%");
+}, "The prototype chain must be correct");
 
-//   assert_equals(Object.getOwnPropertyNames(prototype1).length, 0, "The [[Prototype]] must have no properties");
-//   assert_equals(prototype2, Object.prototype, "The [[Prototype]]'s [[Prototype]] must be %ObjectPrototype%");
-// }, "The prototype chain must be correct");
 /* eslint-enable */