UnitTests: two test Failures in Compile.t

[bschmalhofer]

The cause is that Kernel::System::DateTime is loaded for use DateTime 1.08, which is not wanted.
The wrong module is loaded because Kernel/System is in @INC. The reason for that is not obvious. It is probably some unfortunate use lib $FindBin::Bin statement.

 DateTime defines neither package nor VERSION--version check failed at /opt/otobo/Kernel/System/DateTime.pm line 38.
# BEGIN failed--compilation aborted at /opt/otobo/Kernel/System/DateTime.pm line 38.
# Compilation failed in require at /opt/otobo/Kernel/System/DateTime.pm line 38.
# BEGIN failed--compilation aborted at /opt/otobo/Kernel/System/DateTime.pm line 38.
# Compilation failed in require at /opt/otobo/Kernel/Language.pm line 28.
# BEGIN failed--compilation aborted at /opt/otobo/Kernel/Language.pm line 28.
# Compilation failed in require at /opt/otobo/Kernel/Output/HTML/Layout.pm line 30.
# BEGIN failed--compilation aborted at /opt/otobo/Kernel/Output/HTML/Layout.pm line 30.
# Compilation failed in require at /opt/otobo/Kernel/System/ObjectManager.pm line 34.
# BEGIN failed--compilation aborted at /opt/otobo/Kernel/System/ObjectManager.pm line 34.
# Compilation failed in require at Kernel/System/UnitTest/RegisterDriver.pm line 42.
# BEGIN failed--compilation aborted at Kernel/System/UnitTest/RegisterDriver.pm line 42.

[bschmalhofer]

Kernel::Config::Defaults is the culprit. This module sets @INC based on the location of the including script. A minimal example is:

otobo@5bc1685c346c:~$ cat Kernel/System/UnitTest/t.pl 
use FindBin qw($Bin);
use lib "$Bin/..";

use DateTime 1.08;
otobo@5bc1685c346c:~$ perl -c Kernel/System/UnitTest/t.pl 
DateTime defines neither package nor VERSION--version check failed at /opt/otobo/Kernel/System/UnitTest/../DateTime.pm line 38.
BEGIN failed--compilation aborted at /opt/otobo/Kernel/System/UnitTest/../DateTime.pm line 38.
Compilation failed in require at Kernel/System/UnitTest/t.pl line 4.
BEGIN failed--compilation aborted at Kernel/System/UnitTest/t.pl line 4.
otobo@5bc1685c346c:~$ 

Kernel::System is added to @INC, thusKernel::System::DateTimeis loaded, which has no version.

The fix is to remove the setup of @INC in Kernel/Config/Defaults.pm.

This was already fixed in #174, cc36ed8, but the patch was reverted because apparently other problems propped up. For OTOBO 10.1 this was fixed in #222.

[bschmalhofer]

Tests look fine. Closing the issue.