Remove session scope from fixtures

pytest seems to prepare os.environ in complex ways, so we want to ensure
these fixtures are not reused.

tests/conftest.py

@@ -131,12 +131,12 @@ def spoof(tmp_path_factory, **kwargs):
     return env
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_tesseract_noop(tmp_path_factory):
     return spoof(tmp_path_factory, tesseract='tesseract_noop.py')
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_tesseract_cache(tmp_path_factory):
     if running_in_docker():
         return os.environ.copy()

tests/test_ghostscript.py

@@ -31,28 +31,28 @@ run_ocrmypdf_api = pytest.helpers.run_ocrmypdf_api
 spoof = pytest.helpers.spoof
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_no_tess_gs_render_fail(tmp_path_factory):
     return spoof(
         tmp_path_factory, tesseract='tesseract_noop.py', gs='gs_render_failure.py'
     )
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_no_tess_gs_raster_fail(tmp_path_factory):
     return spoof(
         tmp_path_factory, tesseract='tesseract_noop.py', gs='gs_raster_failure.py'
     )
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_no_tess_no_pdfa(tmp_path_factory):
     return spoof(
         tmp_path_factory, tesseract='tesseract_noop.py', gs='gs_pdfa_failure.py'
     )
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_no_tess_pdfa_warning(tmp_path_factory):
     return spoof(
         tmp_path_factory, tesseract='tesseract_noop.py', gs='gs_feature_elision.py'

tests/test_main.py

@@ -45,12 +45,12 @@ spoof = pytest.helpers.spoof
 RENDERERS = ['hocr', 'sandwich']
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_tesseract_crash(tmp_path_factory):
     return spoof(tmp_path_factory, tesseract='tesseract_crash.py')
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_tesseract_big_image_error(tmp_path_factory):
     return spoof(tmp_path_factory, tesseract='tesseract_big_image_error.py')
 

tests/test_stdio.py

@@ -33,7 +33,7 @@ run_ocrmypdf_api = pytest.helpers.run_ocrmypdf
 spoof = pytest.helpers.spoof
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture
 def spoof_tess_bad_utf8(tmp_path_factory):
     return spoof(tmp_path_factory, tesseract='tesseract_badutf8.py')
 

tests/test_unpaper.py

@@ -43,7 +43,7 @@ def have_unpaper():
         return True
 
 
-@pytest.fixture(scope="session")
+@pytest.fixture
 def spoof_unpaper_oldversion(tmp_path_factory):
     return spoof(tmp_path_factory, unpaper="unpaper_oldversion.py")