Building on macOS fails as of 22 Jul 2017 (pre-beta 5) #4324

Describing PackageManagement Acceptance Test
 [-] Error occurred in Describe block 88ms
   The term 'Register-PackageSource' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
   At /Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Modules/PackageManagement/PackageManagement.Tests.ps1:23 char:5
Describing PowerShellGet - Module tests
Import-Module : The specified module 'PackageManagement' was not loaded because no valid module file was found in any module directory.
At /Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Modules/PowerShellGet/PowerShellGet.Tests.ps1:73 char:5
+     Import-Module PackageManagement
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (PackageManagement:String) [Import-Module], FileNotFoundException
    + FullyQualifiedErrorId : Modules_ModuleNotFound,Microsoft.PowerShell.Commands.ImportModuleCommand
 
 [-] Error occurred in Describe block 152ms
   The term 'Get-PackageProvider' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
   At /Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Modules/PowerShellGet/PowerShellGet.Tests.ps1:74 char:5
 [-] Error occurred in test script '/Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Modules/PowerShellGet/PowerShellGet.Tests.ps1' 139ms
   Cannot index into a null array.
   at Describe, /Users/mklement/Projects/OSS/PowerShell.Org/src/powershell-unix/bin/Linux/netcoreapp2.0/osx.10.12-x64/publish/Modules/Pester/Functions/Describe.ps1: line 117
 [-] Error occurred in test script '/Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Modules/PSDesiredStateConfiguration/MOF-Compilation.Tests.ps1' 123ms
   Exception calling "EnterDescribe" with "1" argument(s): "You already are in Describe, you cannot enter Describe twice"
   at Describe, /Users/mklement/Projects/OSS/PowerShell.Org/src/powershell-unix/bin/Linux/netcoreapp2.0/osx.10.12-x64/publish/Modules/Pester/Functions/Describe.ps1: line 85
 [-] Error occurred in test script '/Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Modules/PSReadLine/PSReadLine.Tests.ps1' 115ms
   Exception calling "EnterDescribe" with "1" argument(s): "You already are in Describe, you cannot enter Describe twice"
   at Describe, /Users/mklement/Projects/OSS/PowerShell.Org/src/powershell-unix/bin/Linux/netcoreapp2.0/osx.10.12-x64/publish/Modules/Pester/Functions/Describe.ps1: line 85
 [-] Error occurred in test script '/Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/Provider/ProviderIntrinsics.Tests.ps1' 125ms
   Exception calling "EnterDescribe" with "1" argument(s): "You already are in Describe, you cannot enter Describe twice"
   at Describe, /Users/mklement/Projects/OSS/PowerShell.Org/src/powershell-unix/bin/Linux/netcoreapp2.0/osx.10.12-x64/publish/Modules/Pester/Functions/Describe.ps1: line 85
 [-] Error occurred in test script '/Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/SDK/Json.Tests.ps1' 127ms
   Exception calling "EnterDescribe" with "1" argument(s): "You already are in Describe, you cannot enter Describe twice"
   at Describe, /Users/mklement/Projects/OSS/PowerShell.Org/src/powershell-unix/bin/Linux/netcoreapp2.0/osx.10.12-x64/publish/Modules/Pester/Functions/Describe.ps1: line 85
 [-] Error occurred in test script '/Users/mklement/Projects/OSS/PowerShell.Org/test/powershell/SDK/PSDebugging.Tests.ps1' 121ms
   Exception calling "EnterDescribe" with "1" argument(s): "You already are in Describe, you cannot enter Describe twice"
   at Describe, /Users/mklement/Projects/OSS/PowerShell.Org/src/powershell-unix/bin/Linux/netcoreapp2.0/osx.10.12-x64/publish/Modules/Pester/Functions/Describe.ps1: line 85
Tests completed in 348.08s
Passed: 5298 Failed: 8 Skipped: 609 Pending: 149