don't unload

Author: majocha

tests/FSharp.Test.Utilities/CompilerAssert.fs

@@ -3,6 +3,7 @@
 namespace FSharp.Test
 
 open System.Threading
+open OpenTelemetry.Resources
 
 #nowarn "57"
 
@@ -376,23 +377,25 @@ module CompilerAssertHelpers =
         let setup = AppDomainSetup(ApplicationBase = thisAssemblyDirectory)
         let testCaseDomain = AppDomain.CreateDomain($"built app {assembly}", null, setup)
 
-        testCaseDomain.add_AssemblyResolve(fun _ args ->
+        let handler = ResolveEventHandler(fun _ args ->
             dependecies
             |> List.tryFind (fun path -> Path.GetFileNameWithoutExtension path = AssemblyName(args.Name).Name)
             |> Option.filter FileSystem.FileExistsShim
             |> Option.map Assembly.LoadFile
             |> Option.toObj
         )
 
+        testCaseDomain.add_AssemblyResolve handler
+
         let worker =
             (testCaseDomain.CreateInstanceFromAndUnwrap(typeof<Worker>.Assembly.CodeBase, typeof<Worker>.FullName)) :?> Worker
 
         let outcome, output, errors = worker.ExecuteTestCase assembly isFsx
         // Replay streams captured in appdomain.
         printf $"{output}"
         eprintf $"{errors}"
-        
-        AppDomain.Unload testCaseDomain
+
+        testCaseDomain.remove_AssemblyResolve handler
 
         outcome, output, errors