dnvm install / upgrade should put the installed runtime on path even if the runtime is already installed

Fixes: #199

Author: Praburaj

src/dnvm.ps1

@@ -1038,8 +1038,6 @@ function dnvm-install {
         _WriteDebug "Cleaning temporary directory $UnpackFolder"
         Remove-Item $UnpackFolder -Force | Out-Null
 
-        dnvm-use $PackageVersion -Architecture:$Architecture -Runtime:$Runtime -Persistent:$Persistent
-
         if ($Runtime -eq "clr") {
             if (-not $NoNative) {
                 if ((Is-Elevated) -or $Ngen) {
@@ -1073,6 +1071,8 @@ function dnvm-install {
         }
     }
 
+    dnvm-use $PackageVersion -Architecture:$Architecture -Runtime:$Runtime -Persistent:$Persistent
+
     if($Alias) {
         _WriteDebug "Aliasing installed runtime to '$Alias'"
         dnvm-alias $Alias $PackageVersion -Architecture:$Architecture -Runtime:$Runtime

test/ps1/tests/Install.Tests.ps1

@@ -77,7 +77,7 @@ Describe "install" -Tag "install" {
         $runtimeName = GetRuntimeName -clr CLR -arch x86
 
         It "uses x86" {
-            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed."
+            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed.`r`nAdding $UserPath\runtimes\$runtimeName\bin to process PATH"
         }
     }
 
@@ -86,7 +86,7 @@ Describe "install" -Tag "install" {
         $runtimeName = GetRuntimeName -clr CLR -arch x86
 
         It "uses Desktop CLR" {
-            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed."
+            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed.`r`nAdding $UserPath\runtimes\$runtimeName\bin to process PATH"
         }
     }
 
@@ -95,7 +95,7 @@ Describe "install" -Tag "install" {
         $runtimeName = GetRuntimeName -clr CLR -arch x86
 
         It "uses x86/Desktop" {
-            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed."
+            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed.`r`nAdding $UserPath\runtimes\$runtimeName\bin to process PATH"
         }
     }
 
@@ -128,7 +128,7 @@ Describe "install" -Tag "install" {
         $runtimePath = "$UserPath\runtimes\$runtimeName"
         It "ensures the runtime is installed" {
             __dnvmtest_run install $TestRuntimeVersion -arch x86 -r "CLR" | Out-Null
-            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed."
+            $__dnvmtest_out.Trim() | Should Be "'$runtimeName' is already installed.`r`nAdding $UserPath\runtimes\$runtimeName\bin to process PATH"
             $runtimePath | Should Exist
         }
     }