added type to returned objects

replaced expand-ziparchive with call to Archive module
added defaults to location of opencover.xml, opencover installation, powershell.exe, and location of tests
updated error messages with corrective action
replaced System.Net.WebClient call (not available on coreclr) with invoke-webrequest
scoped change of executionpolicy to process when starting pester to avoid error if system policy is less restrictive
updated version of module

test/tools/OpenCover/OpenCover.psd1

@@ -1,6 +1,6 @@
 @{
 RootModule = 'OpenCover.psm1'
-ModuleVersion = '1.0.0.0'
+ModuleVersion = '1.1.0.0'
 GUID = '4eedcffd-26e8-4172-8aad-9b882c13d370'
 Author = 'Microsoft Corporation'
 CompanyName = 'Microsoft Corporation'

test/tools/OpenCover/OpenCover.psm1

@@ -1,5 +1,7 @@
 #region privateFunctions
 
+$script:psRepoPath = git rev-parse --show-toplevel
+
 function Get-AssemblyCoverageData([xml.xmlelement] $element)
 {
     $coverageSummary = (Get-CoverageSummary -element $element.Summary)
@@ -11,7 +13,8 @@ function Get-AssemblyCoverageData([xml.xmlelement] $element)
     }
 
     $AssemblyCoverageData | Add-Member -MemberType ScriptMethod -Name ToString -Value { "{0} ({1})" -f $this.AssemblyName,$this.CoverageSummary.BranchCoverage } -Force
-    
+    $AssemblyCoverageData.PSTypeNames.Insert(0,"OpenCover.AssemblyCoverageData")
+
     return $AssemblyCoverageData
 }
 
@@ -48,6 +51,7 @@ function Get-CodeCoverageChange($r1, $r2)
         SequenceDelta = [double] ($r2.Summary.SequenceCoverage - $r1.Summary.SequenceCoverage)
         Deltas = $Deltas
     }
+    $CoverageChange.PSTypeNames.Insert(0,"OpenCover.CoverageChange")
 
     return $CoverageChange
 }
@@ -72,6 +76,7 @@ function Get-AssemblyCoverageChange($r1, $r2)
         Sequence = $r2.Sequence
         SequenceDelta = $r2.Sequence - $r1.Sequence
     }
+    $AssemblyCoverageChange.PSTypeNames.Insert(0,"OpenCover.AssemblyCoverageChange")
 
     return $AssemblyCoverageChange
 }
@@ -91,6 +96,7 @@ function Get-CoverageData($xmlPath)
         CoverageSummary = (Get-CoverageSummary -element $CoverageXml.CoverageSession.Summary)
         Assembly = $assemblies
     }
+    $CoverageData.PSTypeNames.Insert(0,"OpenCover.CoverageData")
 
     $null = $CoverageXml
 
@@ -118,45 +124,11 @@ function Get-CoverageSummary([xml.xmlelement] $element)
     }
 
     $CoverageSummary | Add-Member -MemberType ScriptMethod -Name ToString -Value { "Branch:{0,3} Sequence:{1,3}" -f $this.BranchCoverage,$this.SequenceCoverage } -Force
-        
+    $CoverageSummary.PSTypeNames.Insert(0,"OpenCover.CoverageSummary")
+
     return $CoverageSummary
 }
 
-function Expand-ZipArchive([string] $Path, [string] $DestinationPath)
-{
-    try
-    {
-        Add-Type -AssemblyName System.IO.Compression
-        Add-Type -AssemblyName System.IO.Compression.FileSystem
-
-        $fileStream = New-Object System.IO.FileStream -ArgumentList @($Path, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read) 
-        $zipArchive = New-Object System.IO.Compression.ZipArchive -ArgumentList @($fileStream, [System.IO.Compression.ZipArchiveMode]::Read, $false)
-
-        foreach($entry in $zipArchive.Entries)
-        {
-            $extractPath = (Join-Path $DestinationPath $entry.FullName)
-
-            $fileInfo = New-Object System.IO.FileInfo -ArgumentList $extractPath
-            if(-not $fileInfo.Directory.Exists) { New-Item -Path $fileInfo.Directory.FullName -ItemType Directory | Out-Null }
-
-            try
-            {
-                $newfileStream = [System.IO.File]::Create($extractPath)
-                $entry.Open().CopyTo($newfileStream)
-            }
-            finally
-            {                
-                if($newfileStream) { $newfileStream.Dispose() }
-            }
-        }
-    }
-    finally
-    {
-        if($zipArchive) { $zipArchive.Dispose() }
-        if($fileStream) { $fileStream.Dispose() }
-    }    
-}
-
 #endregion
 
 <#
@@ -209,7 +181,7 @@ function Expand-ZipArchive([string] $Path, [string] $DestinationPath)
 #>
 function Get-CodeCoverage
 {
-    param ( [string]$CoverageXmlFile )
+    param ( [string]$CoverageXmlFile = "$pwd/OpenCover.xml" )
     $xmlPath = (get-item $CoverageXmlFile).Fullname
     (Get-CoverageData -xmlPath $xmlPath)
 }
@@ -306,22 +278,22 @@ function Install-OpenCover
 {
     param ( 
         [parameter()][string]$Version = "4.6.519",
-        [parameter(Mandatory=$true)][string]$TargetDirectory,
+        [parameter()][string]$TargetDirectory = "~/",
         [parameter()][switch]$Force
         )
 
-    $webclient = New-Object System.Net.WebClient
     $filename =  "opencover.${version}.zip"
+    $tempPath = "$env:TEMP/$Filename"
     $packageUrl = "https://github.com/OpenCover/opencover/releases/download/${version}/${filename}"
-    if ( test-path $env:TEMP/$Filename )
+    if ( test-path $tempPath )
     {
         if ( $force ) 
         {
-            remove-item -force "$env:TEMP/$Filename"
+            remove-item -force $tempPath
         }
         else 
         {
-            throw "package already exists at $env:TEMP/$Filename, not downloading"
+            throw "Package already exists at $tempPath, not continuing.  Use -force to re-install"
         }
     }
     if ( test-path "$TargetDirectory/OpenCover" )
@@ -332,18 +304,19 @@ function Install-OpenCover
         }
         else 
         {
-            throw "$TargetDirectory/OpenCover exists"
+            throw "$TargetDirectory/OpenCover exists, not continuing.  Use -force to re-install"
         }
     }
 
-    $webclient.DownloadFile($packageUrl, "$env:TEMP/$filename")
+    Invoke-WebRequest -Uri $packageUrl -OutFile "$tempPath"
-    if ( ! (test-path $env:TEMP/$Filename) )
+    if ( ! (test-path $tempPath) )
     {
         throw "Download failed: $packageUrl"
     }
     
     import-module Microsoft.PowerShell.Archive
-    Expand-ZipArchive -Path "$env:TEMP/$filename" -DestinationPath "$TargetDirectory/OpenCover"
+    Expand-Archive -Path $tempPath -DestinationPath "$TargetDirectory/OpenCover"
+    Remove-Item -force $tempPath
 }
 
 <#
@@ -359,22 +332,15 @@ function Invoke-OpenCover
     [CmdletBinding(SupportsShouldProcess=$true)]
     param ( 
         [parameter()]$OutputLog = "$pwd/OpenCover.xml",
-        [parameter(Mandatory=$true)]$TestDirectory,
+        [parameter()]$TestDirectory = "$($script:psRepoPath)/test/powershell",
-        [parameter()]$OpenCoverPath,
+        [parameter()]$OpenCoverPath = "~/OpenCover",
-        [parameter(Mandatory=$true)]$PowerShellExeDirectory,
+        [parameter()]$PowerShellExeDirectory = "$($script:psRepoPath)/src/powershell-win-core/bin/debug/netcoreapp1.0/win10-x64",
         [switch]$CIOnly
         )
 
     # check to be sure that OpenCover is present
 
-    if(-not $PSBoundParameters.ContainsKey('OpenCoverPath'))
+    $OpenCoverBin = "$OpenCoverPath\opencover.console.exe"
-    {        
-        $openCoverBin = (Get-Command -Name 'opencover.console' -ErrorAction Ignore).Source         
-    }
-    else 
-    {
-        $OpenCoverBin = "$OpenCoverPath\opencover.console.exe"
-    }
 
     if ( ! (test-path $OpenCoverBin)) 
     {
@@ -389,7 +355,7 @@ function Invoke-OpenCover
     }
 
     # create the arguments for OpenCover
-    $targetArgs = "-c", "Set-ExecutionPolicy Bypass -Force;", "Invoke-Pester","${TestDirectory}" 
+    $targetArgs = "-c", "Set-ExecutionPolicy Bypass -Force -Scope Process;", "Invoke-Pester","${TestDirectory}" 
     
     if ( $CIOnly ) 
     {