StrErr support

[random-ua]

No description provided.

[shaggy8871]

Nice job, by the way.

[random-ua]

Unit tests are failing - not sure what am I doing wrong

Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'Console Application 1.0\n
-\n
-usage: ./vendor/bin/phpunit [command] [arguments]\n
-\n
-Commands:\n
-  app:simple\n
-\n
-'
+''