tests: cache sample files

Author: henryborchers

tests/conftest.py

@@ -23,7 +23,7 @@ def download_images(url, download_path):
         return output
 def extract_images(path, destination):
     print("Extracting images")
-    with tarfile.open(os.path.join(path, "sample_images.tar.gz"), "r:gz") as archive_file:
+    with tarfile.open(path, "r:gz") as archive_file:
         for item in archive_file.getmembers():
             print("Extracting {}".format(item.name))
             archive_file.extract(item, path=destination)
@@ -52,7 +52,7 @@ def sample_images_readonly(tmpdir_factory):
                 download_path=download_path
             )
         verify_hash(archive, sha256_hash=SAMPLE_IMAGES_SHA256)
-        extract_images(path=download_path, destination=test_path)
+        extract_images(path=archive, destination=test_path)
     yield sample_images_path
     if os.path.exists(test_path):
         shutil.rmtree(test_path)