Remove fixture for dummy fetcher

tests/tasks/conftest.py

@@ -24,8 +24,6 @@ Common task fixtures.
 
 from typing import Dict
 
-import pytest
-
 from fimfarchive.exceptions import InvalidStoryError
 from fimfarchive.fetchers import Fetcher
 from fimfarchive.stories import Story
@@ -71,11 +69,3 @@ class DummyFetcher(Fetcher):
             return self.stories[key]
         except KeyError:
             raise InvalidStoryError()
-
-
-@pytest.fixture
-def dummy() -> DummyFetcher:
-    """
-    Returns a `Fetcher` dummy.
-    """
-    return DummyFetcher()

tests/tasks/test_update.py

@@ -22,7 +22,6 @@ Update task tests.
 #
 
 
-from copy import deepcopy
 from unittest.mock import MagicMock, call, patch
 
 import pytest
@@ -34,6 +33,8 @@ from fimfarchive.tasks.update import (
     UpdateTask, SUCCESS_DELAY, SKIPPED_DELAY, FAILURE_DELAY,
 )
 
+from .conftest import DummyFetcher
+
 
 class TestUpdateTask:
     """
@@ -41,18 +42,18 @@ class TestUpdateTask:
     """
 
     @pytest.fixture
-    def fimfiction(self, dummy):
+    def fimfiction(self):
         """
         Returns a `Fetcher` simulating Fimfiction.
         """
-        return deepcopy(dummy)
+        return DummyFetcher()
 
     @pytest.fixture
-    def fimfarchive(self, dummy):
+    def fimfarchive(self):
         """
         Returns a `Fetcher` simulating Fimfarchive.
         """
-        return deepcopy(dummy)
+        return DummyFetcher()
 
     @pytest.fixture
     def selector(self):