From 230e45d609df963ac2ed9628191a9db148de4ff1 Mon Sep 17 00:00:00 2001
From: Jonas Schumacher <github735@jonasschumacher.de>
Date: Wed, 8 Apr 2026 11:12:50 +0200
Subject: [PATCH] Fix self-creating in-memory MDFs

---
 src/MDFInMemory.jl  | 1 +
 test/MDFInMemory.jl | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/src/MDFInMemory.jl b/src/MDFInMemory.jl
index 63437df8..9141a827 100644
--- a/src/MDFInMemory.jl
+++ b/src/MDFInMemory.jl
@@ -604,6 +604,7 @@ mutable struct MDFv2InMemory <: MPIFile # TODO: Not sure, if MPIFile is a good f
   end
 end
 
+MDFv2InMemory(mdfFile::MDFv2InMemory) = deepcopy(mdffile)
 MDFv2InMemory(mdfFile::MDFFileV2) = inMemoryMDFFromMDFFileV2(mdfFile)
 MDFv2InMemory(dict::Dict) = inMemoryMDFFromDict(dict)
 
diff --git a/test/MDFInMemory.jl b/test/MDFInMemory.jl
index 27769499..ccb9857d 100644
--- a/test/MDFInMemory.jl
+++ b/test/MDFInMemory.jl
@@ -226,6 +226,13 @@ end
     @test rxUnit(mdf) == "V"
   end
 
+  @testset "Self-creation" begin
+    mdf = defaultMDFv2InMemory()
+    mdf_self = MDFv2InMemory(mdf)
+
+    @test typeof(mdf_self) == MDFv2InMemory
+  end
+
   @testset "Dict" begin
     @testset "String keys" begin
       dict = Dict{String, Any}()