Remove str() wrapping on Path objects in tests

open() accepts Path objects directly since Python 3.6. Remove
the unnecessary str() conversion in test_get_host_success and
test_get_host_404.

Closes #33

Author: dannywillems

tests/test_client.py

@@ -65,7 +65,7 @@ def test_accept_header(self):
 class TestGetHost:
     def test_get_host_success(self, client):
         for f in HOSTS_SUCCESS_RESULTS_DIR.iterdir():
-            with open(str(f)) as ff:
+            with open(f) as ff:
                 res_json = json.load(ff)
             ipv4 = f.name[:-5]  # remove .json
             with requests_mock.Mocker() as m:
@@ -78,7 +78,7 @@ def test_get_host_success(self, client):
 
     def test_get_host_404(self, client):
         for f in HOSTS_404_RESULTS_DIR.iterdir():
-            with open(str(f)) as ff:
+            with open(f) as ff:
                 res_json = json.load(ff)
             ipv4 = f.name[:-5]  # remove .json
             with requests_mock.Mocker() as m: