diff --git a/baybe/insights/shap.py b/baybe/insights/shap.py
index 50516a407..3f7140214 100644
--- a/baybe/insights/shap.py
+++ b/baybe/insights/shap.py
@@ -1,5 +1,7 @@
 """SHAP insights."""
 
+from __future__ import annotations
+
 import inspect
 import numbers
 import warnings
@@ -115,7 +117,7 @@ def from_campaign(
         explained_data: pd.DataFrame | None = None,
         explainer_cls: type[shap.Explainer] | str = "KernelExplainer",
         use_comp_rep: bool = False,
-    ):
+    ) -> SHAPInsight:
         """Create a SHAP insight from a campaign.
 
         Args:
@@ -161,7 +163,7 @@ def from_recommender(
         explained_data: pd.DataFrame | None = None,
         explainer_cls: type[shap.Explainer] | str = "KernelExplainer",
         use_comp_rep: bool = False,
-    ):
+    ) -> SHAPInsight:
         """Create a SHAP insight from a recommender.
 
         Args:
diff --git a/tests/conftest.py b/tests/conftest.py
index c82630cd4..1dc620741 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -591,6 +591,13 @@ def fixture_campaign(parameters, constraints, recommender, objective):
     )
 
 
+@pytest.fixture(name="ongoing_campaign")
+def fixture_ongoing_campaign(campaign, n_iterations, batch_size):
+    """Returns a campaign that already ran for several iterations."""
+    run_iterations(campaign, n_iterations, batch_size)
+    return campaign
+
+
 @pytest.fixture(name="searchspace")
 def fixture_searchspace(parameters, constraints):
     """Returns a searchspace."""
diff --git a/tests/insights/test_shap.py b/tests/insights/test_shap.py
index 0b2122989..19781bf84 100644
--- a/tests/insights/test_shap.py
+++ b/tests/insights/test_shap.py
@@ -38,8 +38,9 @@
 
 def _test_shap_insight(campaign, explainer_cls, use_comp_rep, is_shap):
     """Helper function for general SHAP explainer tests."""
-    run_iterations(campaign, n_iterations=2, batch_size=1)
+    # run_iterations(campaign, n_iterations=2, batch_size=5)
     try:
+        # Sanity check explainer
         shap_insight = SHAPInsight.from_campaign(
             campaign,
             explainer_cls=explainer_cls,
@@ -51,8 +52,11 @@ def _test_shap_insight(campaign, explainer_cls, use_comp_rep, is_shap):
             ALL_EXPLAINERS[explainer_cls],
         )
         assert shap_insight.uses_shap_explainer == is_shap
+
+        # Sanity check explanation
         shap_explanation = shap_insight.explanation
         assert isinstance(shap_explanation, shap.Explanation)
+
         df = pd.DataFrame({"Num_disc_1": [0, 2]})
         with pytest.raises(
             ValueError,
@@ -89,9 +93,9 @@ def _test_shap_insight(campaign, explainer_cls, use_comp_rep, is_shap):
     ],
     ids=["continuous_params", "hybrid_params"],
 )
-def test_shapley_with_measurements(campaign, explainer_cls, use_comp_rep):
+def test_shapley_with_measurements(ongoing_campaign, explainer_cls, use_comp_rep):
     """Test the explain functionalities with measurements."""
-    _test_shap_insight(campaign, explainer_cls, use_comp_rep, is_shap=True)
+    _test_shap_insight(ongoing_campaign, explainer_cls, use_comp_rep, is_shap=True)
 
 
 @pytest.mark.parametrize("explainer_cls", NON_SHAP_EXPLAINERS)
@@ -101,10 +105,12 @@ def test_shapley_with_measurements(campaign, explainer_cls, use_comp_rep):
     [["Categorical_1", "SomeSetting", "Num_disc_1", "Conti_finite1"]],
     ids=["hybrid_params"],
 )
-def test_non_shapley_explainers(campaign, explainer_cls):
+def test_non_shapley_explainers(ongoing_campaign, explainer_cls):
     """Test the explain functionalities with the non-SHAP explainer MAPLE."""
     """Test the non-SHAP explainer in computational representation."""
-    _test_shap_insight(campaign, explainer_cls, use_comp_rep=True, is_shap=False)
+    _test_shap_insight(
+        ongoing_campaign, explainer_cls, use_comp_rep=True, is_shap=False
+    )
 
 
 @pytest.mark.slow
@@ -117,11 +123,11 @@ def test_non_shapley_explainers(campaign, explainer_cls):
     [["Categorical_1", "SomeSetting", "Num_disc_1", "Conti_finite1"]],
     ids=["hybrid_params"],
 )
-def test_shap_insight_plots(campaign, use_comp_rep, plot_type):
+def test_shap_insight_plots(ongoing_campaign, use_comp_rep, plot_type):
     """Test the default SHAP plots."""
-    run_iterations(campaign, n_iterations=2, batch_size=1)
+    # run_iterations(onngoing_campaign, n_iterations=2, batch_size=1)
     shap_insight = SHAPInsight.from_campaign(
-        campaign,
+        ongoing_campaign,
         use_comp_rep=use_comp_rep,
     )
     with mock.patch("matplotlib.pyplot.show"):
@@ -136,7 +142,8 @@ def test_updated_campaign_explanations(campaign):
         ValueError,
         match="The campaign does not contain any measurements.",
     ):
-        shap_insight = SHAPInsight.from_campaign(campaign)
+        SHAPInsight.from_campaign(campaign)
+
     run_iterations(campaign, n_iterations=2, batch_size=1)
     shap_insight = SHAPInsight.from_campaign(campaign)
     explanation_two_iter = shap_insight.explanation
@@ -148,14 +155,14 @@ def test_updated_campaign_explanations(campaign):
 
 @pytest.mark.parametrize("recommender", valid_hybrid_bayesian_recommenders)
 @pytest.mark.parametrize("n_grid_points", [5], ids=["grid5"])
-def test_shap_insight_from_recommender(campaign):
+def test_shap_insight_from_recommender(ongoing_campaign):
     """Test the creation of SHAP insights from a recommender."""
-    run_iterations(campaign, n_iterations=2, batch_size=1)
-    recommender = campaign.recommender.recommender
+    # run_iterations(campaign, n_iterations=2, batch_size=1)
+    recommender = ongoing_campaign.recommender.recommender
     shap_insight = SHAPInsight.from_recommender(
         recommender,
-        campaign.searchspace,
-        campaign.objective,
-        campaign.measurements,
+        ongoing_campaign.searchspace,
+        ongoing_campaign.objective,
+        ongoing_campaign.measurements,
     )
     assert isinstance(shap_insight, insights.SHAPInsight)