diff --git a/tests/test_encryption.py b/tests/test_encryption.py
index cb2d1f719..f15e072fa 100644
--- a/tests/test_encryption.py
+++ b/tests/test_encryption.py
@@ -344,6 +344,7 @@ def test_aes_decrypt_corrupted_data():
         aes.decrypt(secrets.token_bytes(num))
 
 
+@pytest.mark.samples()
 def test_encrypt_stream_dictionary(pdf_file_path):
     user_password = secrets.token_urlsafe(10)
 
diff --git a/tests/test_images.py b/tests/test_images.py
index 3e9e8a034..b256efe9f 100644
--- a/tests/test_images.py
+++ b/tests/test_images.py
@@ -73,18 +73,21 @@ def image_similarity(
     return 1 - mse
 
 
+@pytest.mark.samples()
 def test_image_similarity_one():
     path_a = SAMPLE_ROOT / "018-base64-image/page-0-QuickPDFImd32aa1ab.png"
     path_b = path_a
     assert image_similarity(path_a, path_b) == 1
 
 
+@pytest.mark.samples()
 def test_image_similarity_zero():
     path_a = SAMPLE_ROOT / "018-base64-image/page-0-QuickPDFImd32aa1ab.png"
     path_b = SAMPLE_ROOT / "009-pdflatex-geotopo/page-23-Im2.png"
     assert image_similarity(path_a, path_b) == 0
 
 
+@pytest.mark.samples()
 def test_image_similarity_mid():
     path_a = SAMPLE_ROOT / "018-base64-image/page-0-QuickPDFImd32aa1ab.png"
     img_b = Image.open(path_a)
diff --git a/tests/test_text_extraction.py b/tests/test_text_extraction.py
index 58f174f22..1ffa68a3e 100644
--- a/tests/test_text_extraction.py
+++ b/tests/test_text_extraction.py
@@ -19,6 +19,7 @@
 SAMPLE_ROOT = PROJECT_ROOT / "sample-files"
 
 
+@pytest.mark.samples()
 @pytest.mark.parametrize(("visitor_text"), [None, lambda a, b, c, d, e: None])
 def test_multi_language(visitor_text):
     reader = PdfReader(RESOURCE_ROOT / "multilang.pdf")