refactor: Move pytest fixtures to its own file

tests/fixtures.py

@@ -0,0 +1,10 @@
+import os
+import subprocess
+
+import pytest
+
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+def process(tmp_path):
+    os.chdir(tmp_path)
+    process = subprocess.run(['archivebox', 'init'], capture_output=True)
+    return process

tests/test_init.py

@@ -6,14 +6,7 @@ import subprocess
 from pathlib import Path
 import json
 
-import pytest
-
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-def process(tmp_path):
-    os.chdir(tmp_path)
-    process = subprocess.run(['archivebox', 'init'], capture_output=True)
-    return process
-
+from .fixtures import *
 
 def test_init(tmp_path, process):
     assert "Initializing a new ArchiveBox collection in this folder..." in process.stdout.decode("utf-8")