test: Handle UserWarnings correctly in tests

tests/safeds/data/tabular/transformation/test_imputer.py

@@ -1,3 +1,5 @@
+import warnings
+
 import pytest
 from safeds.data.tabular.containers import Table
 from safeds.data.tabular.transformation import Imputer
@@ -120,7 +122,16 @@ def test_should_raise_if_column_not_found(self, strategy: ImputerStrategy) -> No
             },
         )
 
-        transformer = Imputer(strategy).fit(table_to_fit, None)
+        if isinstance(strategy, Imputer.Strategy.Mode):
+            with warnings.catch_warnings():
+                warnings.filterwarnings(
+                    action="ignore",
+                    message=r"There are multiple most frequent values in a column given to the Imputer\..*",
+                    category=UserWarning,
+                )
+                transformer = Imputer(strategy).fit(table_to_fit, None)
+        else:
+            transformer = Imputer(strategy).fit(table_to_fit, None)
 
         table_to_transform = Table(
             {
@@ -280,7 +291,16 @@ def test_should_return_transformed_table(
         strategy: ImputerStrategy,
         expected: Table,
     ) -> None:
-        assert Imputer(strategy).fit_and_transform(table, column_names) == expected
+        if isinstance(strategy, Imputer.Strategy.Mode):
+            with warnings.catch_warnings():
+                warnings.filterwarnings(
+                    action="ignore",
+                    message=r"There are multiple most frequent values in a column given to the Imputer\..*",
+                    category=UserWarning,
+                )
+                assert Imputer(strategy).fit_and_transform(table, column_names) == expected
+        else:
+            assert Imputer(strategy).fit_and_transform(table, column_names) == expected
 
     @pytest.mark.parametrize("strategy", strategies(), ids=lambda x: x.__class__.__name__)
     def test_should_not_change_original_table(self, strategy: ImputerStrategy) -> None:

tests/safeds/data/tabular/transformation/test_one_hot_encoder.py

@@ -1,3 +1,5 @@
+import warnings
+
 import pytest
 from safeds.data.tabular.containers import Table
 from safeds.data.tabular.transformation import OneHotEncoder
@@ -138,7 +140,16 @@ def test_should_return_false_before_fitting(self) -> None:
     )
     def test_should_return_true_after_fitting(self, table: Table) -> None:
         transformer = OneHotEncoder()
-        fitted_transformer = transformer.fit(table, None)
+        with warnings.catch_warnings():
+            warnings.filterwarnings(
+                action="ignore",
+                message=(
+                    r"The columns .+ contain numerical data. The OneHotEncoder is designed to encode non-numerical "
+                    r"values into numerical values"
+                ),
+                category=UserWarning,
+            )
+            fitted_transformer = transformer.fit(table, None)
         assert fitted_transformer.is_fitted()