diff --git a/monai/data/test_time_augmentation.py b/monai/data/test_time_augmentation.py
index 23572dcef4..bcd5ea91a9 100644
--- a/monai/data/test_time_augmentation.py
+++ b/monai/data/test_time_augmentation.py
@@ -106,6 +106,8 @@ class TestTimeAugmentation:
             mode, mean, std, vvc = tt_aug(test_data)
     """
 
+    __test__ = False  # indicate to pytest that this class is not intended for collection
+
     def __init__(
         self,
         transform: InvertibleTransform,
diff --git a/tests/test_arraydataset.py b/tests/test_arraydataset.py
index b61b3c139c..03239a9764 100644
--- a/tests/test_arraydataset.py
+++ b/tests/test_arraydataset.py
@@ -40,6 +40,7 @@
 
 
 class TestCompose(Compose):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def __call__(self, input_, lazy=False):
         img = self.transforms[0](input_)
diff --git a/tests/test_auto3dseg.py b/tests/test_auto3dseg.py
index 6be33bf6ca..5273f0663a 100644
--- a/tests/test_auto3dseg.py
+++ b/tests/test_auto3dseg.py
@@ -123,6 +123,8 @@ class TestOperations(Operations):
     Test example for user operation
     """
 
+    __test__ = False  # indicate to pytest that this class is not intended for collection
+
     def __init__(self) -> None:
         self.data = {"max": np.max, "mean": np.mean, "min": np.min}
 
@@ -132,6 +134,8 @@ class TestAnalyzer(Analyzer):
     Test example for a simple Analyzer
     """
 
+    __test__ = False  # indicate to pytest that this class is not intended for collection
+
     def __init__(self, key, report_format, stats_name="test"):
         self.key = key
         super().__init__(stats_name, report_format)
@@ -149,6 +153,8 @@ class TestImageAnalyzer(Analyzer):
     Test example for a simple Analyzer
     """
 
+    __test__ = False  # indicate to pytest that this class is not intended for collection
+
     def __init__(self, image_key="image", stats_name="test_image"):
         self.image_key = image_key
         report_format = {"test_stats": None}
diff --git a/tests/test_convert_data_type.py b/tests/test_convert_data_type.py
index b95539f4b7..a27a05cf28 100644
--- a/tests/test_convert_data_type.py
+++ b/tests/test_convert_data_type.py
@@ -73,6 +73,7 @@
 
 
 class TestTensor(torch.Tensor):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
     pass
 
 
diff --git a/tests/test_handler_prob_map_producer.py b/tests/test_handler_prob_map_producer.py
index 347f8cb92c..406fe77c8f 100644
--- a/tests/test_handler_prob_map_producer.py
+++ b/tests/test_handler_prob_map_producer.py
@@ -30,6 +30,7 @@
 
 
 class TestDataset(Dataset):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def __init__(self, name, size):
         super().__init__(
@@ -64,6 +65,7 @@ def __getitem__(self, index):
 
 
 class TestEvaluator(Evaluator):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def _iteration(self, engine, batchdata):
         return batchdata
diff --git a/tests/test_handler_validation.py b/tests/test_handler_validation.py
index 752b1d3df7..92f8578f11 100644
--- a/tests/test_handler_validation.py
+++ b/tests/test_handler_validation.py
@@ -22,6 +22,7 @@
 
 
 class TestEvaluator(Evaluator):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def _iteration(self, engine, batchdata):
         engine.state.output = "called"
diff --git a/tests/test_image_filter.py b/tests/test_image_filter.py
index adc9dade9c..76e38d94f4 100644
--- a/tests/test_image_filter.py
+++ b/tests/test_image_filter.py
@@ -38,6 +38,7 @@
 
 
 class TestModule(torch.nn.Module):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def __init__(self):
         super().__init__()
diff --git a/tests/test_prepare_batch_default.py b/tests/test_prepare_batch_default.py
index 9aa498866f..093468ce27 100644
--- a/tests/test_prepare_batch_default.py
+++ b/tests/test_prepare_batch_default.py
@@ -21,6 +21,7 @@
 
 
 class TestNet(torch.nn.Module):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def forward(self, x: torch.Tensor):
         return x
diff --git a/tests/test_prepare_batch_default_dist.py b/tests/test_prepare_batch_default_dist.py
index 0c53a74834..53a79575e6 100644
--- a/tests/test_prepare_batch_default_dist.py
+++ b/tests/test_prepare_batch_default_dist.py
@@ -43,6 +43,7 @@
 
 
 class TestNet(torch.nn.Module):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def forward(self, x: torch.Tensor):
         return x
diff --git a/tests/test_prepare_batch_extra_input.py b/tests/test_prepare_batch_extra_input.py
index f20c6e7352..3c53cc6481 100644
--- a/tests/test_prepare_batch_extra_input.py
+++ b/tests/test_prepare_batch_extra_input.py
@@ -36,6 +36,7 @@
 
 
 class TestNet(torch.nn.Module):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def forward(self, x: torch.Tensor, t1=None, t2=None, t3=None):
         return {"x": x, "t1": t1, "t2": t2, "t3": t3}
diff --git a/tests/test_prepare_batch_hovernet.py b/tests/test_prepare_batch_hovernet.py
index 773fcb53bf..ae9554a3e8 100644
--- a/tests/test_prepare_batch_hovernet.py
+++ b/tests/test_prepare_batch_hovernet.py
@@ -28,6 +28,7 @@
 
 
 class TestNet(torch.nn.Module):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def forward(self, x: torch.Tensor):
         return {HoVerNetBranch.NP: torch.tensor([1, 2]), HoVerNetBranch.NC: torch.tensor([4, 4]), HoVerNetBranch.HV: 16}
diff --git a/tests/test_torchscript_utils.py b/tests/test_torchscript_utils.py
index 6f8f231829..5a5fb47864 100644
--- a/tests/test_torchscript_utils.py
+++ b/tests/test_torchscript_utils.py
@@ -23,6 +23,7 @@
 
 
 class TestModule(torch.nn.Module):
+    __test__ = False  # indicate to pytest that this class is not intended for collection
 
     def forward(self, x):
         return x + 10