Fix issue with streams when using global variable Latest from au_GetLatest

AU/Public/Update-Package.ps1

@@ -285,11 +285,13 @@ function Update-Package {
     }
 
     function set_latest( [HashTable]$latest, [string] $version, $stream ) {
-        if (!$latest.PackageName) { $latest.PackageName = $package.Name }
         if (!$latest.NuspecVersion) { $latest.NuspecVersion = $version }
         if ($stream -and !$latest.Stream) { $latest.Stream = $stream }
         $package.NuspecVersion = $latest.NuspecVersion
-        $global:Latest = $latest
+
+        $global:Latest = $global:au_Latest
+        $latest.Keys | % { $global:Latest.Remove($_) }
+        $global:Latest += $latest
     }
 
     function update_files( [switch]$SkipNuspecFile )
@@ -370,11 +372,14 @@ function Update-Package {
     $package = [AUPackage]::new( $pwd )
     if ($Result) { sv -Scope Global -Name $Result -Value $package }
 
+    $global:Latest = @{PackageName = $package.Name}
+
     [System.Net.ServicePointManager]::SecurityProtocol = 'Ssl3,Tls,Tls11,Tls12' #https://github.com/chocolatey/chocolatey-coreteampackages/issues/366
     $module = $MyInvocation.MyCommand.ScriptBlock.Module
     "{0} - checking updates using {1} version {2}" -f $package.Name, $module.Name, $module.Version | result
     try {
         $res = au_GetLatest | select -Last 1
+        $global:au_Latest = $global:Latest
         if ($res -eq $null) { throw 'au_GetLatest returned nothing' }
 
         if ($res -eq 'ignore') { return $res }

tests/Update-Package.Tests.ps1

@@ -277,6 +277,33 @@ Describe 'Update-Package' -Tag update {
                 function global:au_GetLatest { throw 'test' }
                 { update } | Should Throw "test"
             }
+
+            It 'checks values in $Latest when entering au_GetLatest' {
+                function global:au_GetLatest {
+                    $Latest.Count       | Should Be 1
+                    $Latest.PackageName | Should Be 'test_package'
+                    @{ Version = '1.2' }
+                }
+                update
+            }
+
+            It 'supports returning custom values' {
+                function global:au_GetLatest { @{ Version = '1.2'; NewValue = 1 } }
+                update
+                $global:Latest.NewValue | Should Be 1
+            }
+
+            It 'supports adding values to $global:Latest' {
+                function global:au_GetLatest { $global:Latest += @{ NewValue = 1 }; @{ Version = '1.2' } }
+                update
+                $global:Latest.NewValue | Should Be 1
+            }
+
+            It 'supports adding values to $Latest' {
+                function global:au_GetLatest { $Latest.NewValue = 1; @{ Version = '1.2' } }
+                update
+                $global:Latest.NewValue | Should Be 1
+            }
         }
 
         Context 'Before and after update' {