events: make sure console functions exist

If there's no global console cached, initialize it.

Fixes: https://github.com/nodejs/node/issues/4467
PR-URL: https://github.com/nodejs/node/pull/4479
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/test/parallel/test-global-console-exists.js b/test/parallel/test-global-console-exists.js
new file mode 100644
index 0000000000..1a13ffec29
--- /dev/null
+++ b/test/parallel/test-global-console-exists.js
@@ -0,0 +1,36 @@
+/* eslint-disable required-modules */
+// ordinarily test files must require('common') but that action causes
+// the global console to be compiled, defeating the purpose of this test
+
+'use strict';
+
+const assert = require('assert');
+const EventEmitter = require('events');
+const leak_warning = /EventEmitter memory leak detected\. 2 hello listeners/;
+
+var write_calls = 0;
+process.stderr.write = function(data) {
+  if (write_calls === 0)
+    assert.ok(data.match(leak_warning));
+  else if (write_calls === 1)
+    assert.ok(data.match(/Trace/));
+  else
+    assert.ok(false, 'stderr.write should be called only twice');
+
+  write_calls++;
+};
+
+const old_default = EventEmitter.defaultMaxListeners;
+EventEmitter.defaultMaxListeners = 1;
+
+const e = new EventEmitter();
+e.on('hello', function() {});
+e.on('hello', function() {});
+
+// TODO: figure out how to validate console. Currently,
+// there is no obvious way of validating that console
+// exists here exactly when it should.
+
+assert.equal(write_calls, 2);
+
+EventEmitter.defaultMaxListeners = old_default;