diff --git a/tests/estimation/test_get_estimation.py b/tests/estimation/test_get_estimation.py
index 16953a5..37878d3 100644
--- a/tests/estimation/test_get_estimation.py
+++ b/tests/estimation/test_get_estimation.py
@@ -179,6 +179,7 @@ def x(data):
     return data[0]
 
 
+# t is raveled because some estimators fail with (n,1) inputs
 @pytest.fixture
 def t(data):
     return data[1].ravel()
@@ -191,7 +192,7 @@ def m(data):
 
 @pytest.fixture
 def y(data):
-    return data[3].ravel()
+    return data[3].ravel()  # same reason as t
 
 
 @pytest.fixture
@@ -249,3 +250,15 @@ def test_total_is_direct_plus_indirect(effects_chap):
         assert effects_chap[0] == pytest.approx(effects_chap[1] + effects_chap[4])
     if not np.isnan(effects_chap[2]):
         assert effects_chap[0] == pytest.approx(effects_chap[2] + effects_chap[3])
+
+
+@pytest.mark.xfail
+def test_robustness_to_ravel_format(data, estimator, config, effects_chap):
+    if "forest" in estimator:
+        pytest.skip("Forest estimator skipped")
+    assert np.all(
+        get_estimation(data[0], data[1], data[2], data[3], estimator, config)[0:5]
+        == pytest.approx(
+            effects_chap, nan_ok=True
+        )  # effects_chap is obtained with data[1].ravel() and data[3].ravel()
+    )