Do not convert nil to 404

acceptance/bundle/debug/out.stderr.parallel.txt

@@ -9,7 +9,7 @@
 10:07:59 Debug: ApplyReadOnly pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:folder_permissions
 10:07:59 Debug: ApplyReadOnly pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:validate_sync_patterns
 10:07:59 Debug: Path /Workspace/Users/[USERNAME]/.bundle/debug/default/files has type directory (ID: 0) pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync
-10:07:59 Debug: non-retriable error: Not Found pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync sdk=true
+10:07:59 Debug: non-retriable error: Workspace path not found pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync sdk=true
-< HTTP/0.0 000 Not Found (Error: Not Found) pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync sdk=true
 < HTTP/0.0 000 OK pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync sdk=true
 < } pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync sdk=true
+< } pid=12345 mutator=validate mutator (read-only)=parallel mutator (read-only)=validate:files_to_sync sdk=true

acceptance/bundle/debug/out.stderr.txt

@@ -78,6 +78,9 @@
 10:07:59 Debug: No script defined for postinit, skipping pid=12345 mutator=initialize mutator=seq mutator=scripts.postinit
 10:07:59 Debug: Apply pid=12345 mutator=validate
 10:07:59 Debug: GET /api/2.0/workspace/get-status?path=/Workspace/Users/[USERNAME]/.bundle/debug/default/files
+< HTTP/1.1 404 Not Found
+< {
+<   "message": "Workspace path not found"
 10:07:59 Debug: POST /api/2.0/workspace/mkdirs
 > {
 >   "path": "/Workspace/Users/[USERNAME]/.bundle/debug/default/files"

acceptance/selftest/server/output.txt

@@ -16,6 +16,6 @@ custom
 response
 
 >>> errcode [CLI] workspace get-status /a/b/c
-Error: Not Found
+Error: Workspace path not found
 
 Exit code: 1

libs/testserver/fake_workspace.go

@@ -32,20 +32,27 @@ func NewFakeWorkspace() *FakeWorkspace {
 	}
 }
 
-func (s *FakeWorkspace) WorkspaceGetStatus(path string) *workspace.ObjectInfo {
+func (s *FakeWorkspace) WorkspaceGetStatus(path string) Response {
 	if s.directories[path] {
-		return &workspace.ObjectInfo{
+		return Response{
+			Body: &workspace.ObjectInfo{
 				ObjectType: "DIRECTORY",
 				Path:       path,
+			},
 		}
 	} else if _, ok := s.files[path]; ok {
-		return &workspace.ObjectInfo{
+		return Response{
+			Body: &workspace.ObjectInfo{
 				ObjectType: "FILE",
 				Path:       path,
 				Language:   "SCALA",
+			},
 		}
 	} else {
-		return nil
+		return Response{
+			StatusCode: 404,
+			Body:       map[string]string{"message": "Workspace path not found"},
+		}
 	}
 }
 

libs/testserver/server.go

@@ -87,7 +87,8 @@ func normalizeResponse(t testutil.TestingT, resp any) encodedResponse {
 
 func normalizeResponseBody(t testutil.TestingT, resp any) encodedResponse {
 	if isNil(resp) {
-		return encodedResponse{StatusCode: 404, Body: []byte{}}
+		t.Errorf("Handler must not return nil")
+		return encodedResponse{StatusCode: 500}
 	}
 
 	respBytes, ok := resp.([]byte)
@@ -108,6 +109,14 @@ func normalizeResponseBody(t testutil.TestingT, resp any) encodedResponse {
 
 	respStruct, ok := resp.(Response)
 	if ok {
+		if isNil(respStruct.Body) {
+			return encodedResponse{
+				StatusCode: respStruct.StatusCode,
+				Headers:    respStruct.Headers,
+				Body:       []byte{},
+			}
+		}
+
 		bytesVal, isBytes := respStruct.Body.([]byte)
 		if isBytes {
 			return encodedResponse{