Fix Update-ModuleManifest clears FunctionsToExport, AliasesToExport and NestedModules

Author: throwaway774

Tests/PSGetUpdateModuleManifest.Tests.ps1

@@ -118,7 +118,7 @@ Describe PowerShell.PSGet.UpdateModuleManifest -Tags 'BVT','InnerLoop' {
     # Action:
     #      Update-ModuleManifest -Path [Path] 
     #
-    # Expected Result: The updated manifest should have the same proerty values.
+    # Expected Result: The updated manifest should have the same property values.
     #
     It UpdateModuleManifestWithNoAdditionalParameters2 {    
 
@@ -144,6 +144,30 @@ Describe PowerShell.PSGet.UpdateModuleManifest -Tags 'BVT','InnerLoop' {
 
         AssertEquals $updatedModuleInfo.CompanyName $editedModuleInfo.CompanyName "Company name should be $expectedCompanyName"
         AssertEquals $($text.length) $expectedLength "Number of wildcards should be $expectedLength"
+    }
+
+    # Purpose: Validate Update-ModuleManifest will not reset original parameter values to default values
+    #
+    # Action:
+    #      Update-ModuleManifest -Path [Path]
+    #
+    # Expected Result: The updated manifest should have the same property values.
+    #
+    It UpdateModuleManifestWithNoAdditionalParameters3 {
+
+        New-ModuleManifest -Path $script:testManifestPath -ModuleVersion '1.0' -FunctionsToExport 'function1' -NestedModules 'module1' -AliasesToExport 'alias1'
+        $expectedLength = 4
+        Update-ModuleManifest -Path $script:testManifestPath
+
+        Import-LocalizedData -BindingVariable ModuleManifestHashTable `
+                     -FileName (Microsoft.PowerShell.Management\Split-Path $script:testManifestPath -Leaf) `
+                     -BaseDirectory (Microsoft.PowerShell.Management\Split-Path $script:testManifestPath -Parent) `
+                     -ErrorAction SilentlyContinue `
+                     -WarningAction SilentlyContinue
+
+        AssertEquals $ModuleManifestHashTable.FunctionsToExport 'function1' "FunctionsToExport should be 'function1'"
+        AssertEquals $ModuleManifestHashTable.NestedModules 'module1' "NestedModules should be 'module1'"
+        AssertEquals $ModuleManifestHashTable.AliasesToExport 'alias1' "AliasesToExport should be 'alias1'"
     } 
 
     # Purpose: Validate Update-ModuleManifest will keep the original property values for DefaultCommandPrefix,
@@ -197,8 +221,6 @@ Describe PowerShell.PSGet.UpdateModuleManifest -Tags 'BVT','InnerLoop' {
         }
     }
 
-
-
     # Purpose: Update a module manifest with same parameters
     #
     # Action: Update-ModuleManifest -Path [path] -NestedModules -Guid -Author -CompanyName -Copyright -RootModule -ModuleVersion...
@@ -636,7 +658,6 @@ Describe PowerShell.PSGet.UpdateModuleManifest -Tags 'BVT','InnerLoop' {
 
     } 
 
-
     # Purpose: Validate Update-ModuleManifest will throw errors when there are paths defined in FilePath that are not in the module base
     #
     # Action:

src/PowerShellGet/public/psgetfunctions/Update-ModuleManifest.ps1

@@ -273,13 +273,9 @@ function Update-ModuleManifest
     {
         $params.Add("NestedModules",$NestedModules)
     }
-    elseif($moduleInfo.NestedModules)
+    elseif($ModuleManifestHashTable -and $ModuleManifestHashTable.ContainsKey("NestedModules"))
     {
-        #Get the original module info from ManifestHashTab
-        if($ModuleManifestHashTable -and $ModuleManifestHashTable.ContainsKey("NestedModules"))
-        {
-            $params.Add("NestedModules",$ModuleManifestHashtable.NestedModules)
-        }
+        $params.Add("NestedModules",$ModuleManifestHashtable.NestedModules)
     }
 
     #Guid is read-only property
@@ -522,6 +518,10 @@ function Update-ModuleManifest
             $params.Add("FunctionsToExport",($moduleInfo.ExportedFunctions.Keys -split ' '))
         }
     }
+    elseif ($ModuleManifestHashTable -and $ModuleManifestHashTable.ContainsKey("FunctionsToExport"))
+    {
+        $params.Add("FunctionsToExport", $ModuleManifestHashTable['FunctionsToExport'])
+    }
 
     if($AliasesToExport)
     {
@@ -548,6 +548,10 @@ function Update-ModuleManifest
             $params.Add("AliasesToExport",($moduleInfo.ExportedAliases.Keys -split ' '))
         }
     }
+    elseif ($ModuleManifestHashTable -and $ModuleManifestHashTable.ContainsKey("AliasesToExport"))
+    {
+        $params.Add("AliasesToExport", $ModuleManifestHashTable['AliasesToExport'])
+    }
 
     if($VariablesToExport)
     {
@@ -588,7 +592,7 @@ function Update-ModuleManifest
                 ForEach-Object { $parts = $_ -split '-', 2; $parts[-1] = $parts[-1] -replace "^$($moduleInfo.Prefix)"; $parts -join '-' }
             $params.Add("CmdletsToExport", $originalCmdlets)
         }
-        else 
+        else
         {
             $params.Add("CmdletsToExport",($moduleInfo.ExportedCmdlets.Keys -split ' '))
         }