diff --git a/tests/test_masked_inference_wsi_dataset.py b/tests/test_masked_inference_wsi_dataset.py
index bb90f7900b..df0dafcbe2 100644
--- a/tests/test_masked_inference_wsi_dataset.py
+++ b/tests/test_masked_inference_wsi_dataset.py
@@ -27,11 +27,10 @@
 _, has_cim = optional_import("cucim", name="CuImage")
 _, has_osl = optional_import("openslide")
 
-FILE_KEY = "wsi_img"
+FILE_KEY = "wsi_img.tiff"
 FILE_URL = testing_data_config("images", FILE_KEY, "url")
-base_name, extension = os.path.basename(f"{FILE_URL}"), ".tiff"
-FILE_NAME = f"temp_{base_name}"
-FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", FILE_NAME + extension)
+FILE_NAME = f"temp_{FILE_KEY}"
+FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", FILE_NAME)
 
 MASK1, MASK2, MASK4 = "mask1.npy", "mask2.npy", "mask4.npy"
 
diff --git a/tests/test_masked_patch_wsi_dataset.py b/tests/test_masked_patch_wsi_dataset.py
index 730ce97bdb..b6cb006400 100644
--- a/tests/test_masked_patch_wsi_dataset.py
+++ b/tests/test_masked_patch_wsi_dataset.py
@@ -32,10 +32,9 @@
 _, has_codec = optional_import("imagecodecs")
 has_tiff = has_tiff and has_codec
 
-FILE_KEY = "wsi_img"
+FILE_KEY = "wsi_img.tiff"
 FILE_URL = testing_data_config("images", FILE_KEY, "url")
-base_name, extension = os.path.basename(f"{FILE_URL}"), ".tiff"
-FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", "temp_" + base_name + extension)
+FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", f"temp_{FILE_KEY}")
 
 TEST_CASE_0 = [
     {"data": [{"image": FILE_PATH, WSIPatchKeys.LEVEL: 8, WSIPatchKeys.SIZE: (2, 2)}], "mask_level": 8},
diff --git a/tests/test_patch_wsi_dataset.py b/tests/test_patch_wsi_dataset.py
index d2cc139ebc..6ad2fadf08 100644
--- a/tests/test_patch_wsi_dataset.py
+++ b/tests/test_patch_wsi_dataset.py
@@ -33,10 +33,9 @@
 _, has_codec = optional_import("imagecodecs")
 has_tiff = has_tiff and has_codec
 
-FILE_KEY = "wsi_img"
+FILE_KEY = "wsi_img.tiff"
 FILE_URL = testing_data_config("images", FILE_KEY, "url")
-base_name, extension = os.path.basename(f"{FILE_URL}"), ".tiff"
-FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", "temp_" + base_name + extension)
+FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", f"temp_{FILE_KEY}")
 
 TEST_CASE_DEP_0 = [
     {
diff --git a/tests/test_sliding_patch_wsi_dataset.py b/tests/test_sliding_patch_wsi_dataset.py
index e6d11de739..c4e9c51381 100644
--- a/tests/test_sliding_patch_wsi_dataset.py
+++ b/tests/test_sliding_patch_wsi_dataset.py
@@ -32,10 +32,9 @@
 _, has_codec = optional_import("imagecodecs")
 has_tiff = has_tiff and has_codec
 
-FILE_KEY = "wsi_img"
+FILE_KEY = "wsi_img.tiff"
 FILE_URL = testing_data_config("images", FILE_KEY, "url")
-base_name, extension = os.path.basename(f"{FILE_URL}"), ".tiff"
-FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", "temp_" + base_name + extension)
+FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", f"temp_{FILE_KEY}")
 
 FILE_PATH_SMALL_0 = os.path.join(os.path.dirname(__file__), "testing_data", "temp_wsi_inference_0.tiff")
 FILE_PATH_SMALL_1 = os.path.join(os.path.dirname(__file__), "testing_data", "temp_wsi_inference_1.tiff")
diff --git a/tests/test_smartcache_patch_wsi_dataset.py b/tests/test_smartcache_patch_wsi_dataset.py
index e51033bb4e..5ae15cde5c 100644
--- a/tests/test_smartcache_patch_wsi_dataset.py
+++ b/tests/test_smartcache_patch_wsi_dataset.py
@@ -26,10 +26,9 @@
 _cucim, has_cim = optional_import("cucim")
 has_cim = has_cim and hasattr(_cucim, "CuImage")
 
-FILE_KEY = "wsi_img"
+FILE_KEY = "wsi_img.tiff"
 FILE_URL = testing_data_config("images", FILE_KEY, "url")
-base_name, extension = os.path.basename(f"{FILE_URL}"), ".tiff"
-FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", "temp_" + base_name + extension)
+FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", f"temp_{FILE_KEY}")
 
 TEST_CASE_0 = [
     {
diff --git a/tests/test_wsireader.py b/tests/test_wsireader.py
index d435902c28..65c0e3388b 100644
--- a/tests/test_wsireader.py
+++ b/tests/test_wsireader.py
@@ -36,11 +36,9 @@
 _, has_codec = optional_import("imagecodecs")
 has_tiff = has_tiff and has_codec
 
-FILE_KEY = "wsi_img"
+FILE_KEY = "wsi_img.tiff"
 FILE_URL = testing_data_config("images", FILE_KEY, "url")
-base_name, extension = os.path.basename(f"{FILE_URL}"), ".tiff"
-FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", "temp_" + base_name + extension)
-
+FILE_PATH = os.path.join(os.path.dirname(__file__), "testing_data", f"temp_{FILE_KEY}")
 HEIGHT = 32914
 WIDTH = 46000
 
diff --git a/tests/testing_data/data_config.json b/tests/testing_data/data_config.json
index 788d664439..1a91986fd8 100644
--- a/tests/testing_data/data_config.json
+++ b/tests/testing_data/data_config.json
@@ -1,6 +1,6 @@
 {
     "images": {
-        "wsi_img": {
+        "wsi_img.tiff": {
             "url": "https://github.com/Project-MONAI/MONAI-extra-test-data/releases/download/0.8.1/CMU-1.tiff",
             "hash_type": "sha256",
             "hash_val": "73a7e89bc15576587c3d68e55d9bf92f09690280166240b48ff4b48230b13bcd"