diff --git a/unit_tests/recipes/Test_removeFlatten.cpp b/unit_tests/recipes/Test_removeFlatten.cpp
index 84157f0c21aef2a775011e3ccd130511252e94e9..572fd121a277731f457e04fc54aa63eef24af2c4 100644
--- a/unit_tests/recipes/Test_removeFlatten.cpp
+++ b/unit_tests/recipes/Test_removeFlatten.cpp
@@ -34,8 +34,9 @@ TEST_CASE("[cpu/recipies] RemoveFlatten", "[RemoveFlatten][recipies]") {
   SECTION("flatten last layer : nothing removed because pattern searched is "
           "Flatten=>FC") {
     std::shared_ptr<Aidge::GraphView> g = Sequential({fc0, flatten});
-
+    fmt::print("debug {}", __LINE__);
     removeFlatten(g);
+    fmt::print("debug {}", __LINE__);
 
     CHECK(g->getOrderedInputs().size() == 1);
     CHECK(g->getOrderedOutputs().size() == 1);
@@ -47,8 +48,10 @@ TEST_CASE("[cpu/recipies] RemoveFlatten", "[RemoveFlatten][recipies]") {
   }
   SECTION("flatten first layer : flatten removed") {
     auto g = Sequential({flatten, fc0});
+    fmt::print("debug {}", __LINE__);
 
     removeFlatten(g);
+    fmt::print("debug {}", __LINE__);
 
     CHECK(g->getOrderedInputs().size() == 1);
     CHECK(g->getOrderedOutputs().size() == 1);
@@ -59,10 +62,11 @@ TEST_CASE("[cpu/recipies] RemoveFlatten", "[RemoveFlatten][recipies]") {
     CHECK(g->getRootNode() == fc0);
   }
   SECTION("flatten middle layer") {
-
     auto g = Sequential({fc0, flatten, fc1});
+    fmt::print("debug {}", __LINE__);
 
     removeFlatten(g);
+    fmt::print("debug {}", __LINE__);
 
     CHECK(g->getOrderedInputs().size() == 1);
     CHECK(g->getOrderedOutputs().size() == 1);
@@ -77,9 +81,11 @@ TEST_CASE("[cpu/recipies] RemoveFlatten", "[RemoveFlatten][recipies]") {
     // prod->addChild(flatten, 0);
     // flatten->addChild(fc0, 0);
     // auto g = std::make_shared<GraphView>({prod, flatten, fc0});
+    fmt::print("debug {}", __LINE__);
 
     removeFlatten(g);
 
+    fmt::print("debug {}", __LINE__);
     CHECK(g->getOrderedInputs().size() == 0);
     CHECK(g->getOrderedOutputs().size() == 1);
     CHECK(g->getOrderedInputs()[0].first == fc0);