fix test

- was removing other package, like nunit.console
- was removing other package version (one was in use by dotnet test )

Author: enricosada

integrationtests/Paket.IntegrationTests/LocalOverrideSpecs.fs

@@ -12,7 +12,7 @@ open NUnit.Framework
 
 [<Test>]
 let ``#1633 paket.local local source override``() =
-    clearPackage "NUnit"
+    clearPackageAtVersion "NUnit" "2.6.3"
 
     paketEx true "restore" "i001633-local-source-override" |> ignore
     let doc = new XmlDocument()
@@ -31,14 +31,14 @@ let ``#1633 paket.local local source override``() =
     |> shouldEqual (Some "true")
 
     // The package should not be in cache
-    isPackageCached "NUnit"
+    isPackageCached "NUnit" "2.6.3"
     |> shouldEqual []
 
     // Issue #2690
     paketEx true "restore" "i001633-local-source-override" |> ignore
 
     // The package should not be in cache
-    isPackageCached "NUnit"
+    isPackageCached "NUnit" "2.6.3"
     |> shouldEqual []
 
 let replaceInFile filePath (searchText: string) replaceText =

integrationtests/Paket.IntegrationTests/TestHelper.fs

@@ -254,25 +254,25 @@ let clearPackage name =
             |> Seq.filter (fun n -> Path.GetFileName n |> String.startsWithIgnoreCase name)
             |> Seq.iter (fun n -> File.Delete(n))
 
-let isPackageCached name =
+let isPackageCached name version =
     // ~/.nuget/packages
     let userPackageFolder = Paket.Constants.UserNuGetPackagesFolder
 
     // %APPDATA%/NuGet/Cache
     let nugetCache = Paket.Constants.NuGetCacheFolder
 
-    [ nugetCache; userPackageFolder ]
-    |> List.collect (fun cacheDir ->
+    [ for cacheDir in [ nugetCache; userPackageFolder ] do
         if Directory.Exists cacheDir then
-            let dirs =
+            yield!
                 Directory.EnumerateDirectories(cacheDir)
-                |> Seq.filter (fun n -> Path.GetFileName n |> String.startsWithIgnoreCase name)
-            let files =
-                Directory.EnumerateFiles(cacheDir)
-                |> Seq.filter (fun n -> Path.GetFileName n |> String.startsWithIgnoreCase name)
-            Seq.append dirs files
-            |> Seq.toList
-        else [])
+                |> Seq.filter (fun n -> Path.GetFileName n |> String.equalsIgnoreCase name)
+                |> Seq.collect (fun n -> Directory.EnumerateDirectories(n))
+                |> Seq.filter (fun n -> Path.GetFileName n |> String.equalsIgnoreCase version)
+                |> Seq.toList ]
+
+let clearPackageAtVersion name version =
+    isPackageCached name version
+    |> List.iter (fun n -> Directory.Delete(n, true))
 
 // Checks if a given package is present in cache ONLY with lowercase naming (see issue #2812)
 let isPackageCachedWithOnlyLowercaseNames (name: string) =