fixed some unit tests

Author: tgymnich

Sources/Workspace/Workspace.swift

@@ -423,7 +423,9 @@ public class Workspace {
 
         /// The default location of the git repository cache
         let repositoriesPath: AbsolutePath = {
-            let cacheURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
+            guard let cacheURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first else {
+                return localFileSystem.homeDirectory.appending(components: ".swiftpm", "repositories")
+            }
             return AbsolutePath(cacheURL.path).appending(components: "org.swift.swiftpm", "repositories")
         }()
 
@@ -590,7 +592,6 @@ extension Workspace {
 
         // These are the things we don't want to remove while cleaning.
         let protectedAssets = [
-            repositoryManager.path,
             checkoutsPath,
             artifactsPath,
             state.path,
@@ -632,6 +633,7 @@ extension Workspace {
 
         repositoryManager.reset()
         try? fileSystem.removeFileTree(dataPath)
+        try? fileSystem.removeFileTree(repositoryManager.path)
     }
 
     /// Cancel the active dependency resolution operation.