Replace deprecated nose style setup/teardown with autouse fixtures (#…

…7343)

methods with autouse fixtures. The nose style is no longer supported by
pytest since version 7.2.

https://docs.pytest.org/en/latest/deprecations.html#nose-deprecation

Also remove unnecessary calls to setup_test and teardown_tests 
in rank/tests. These are called in skimage/conftest.py already and I
don't see a reason to call them again in rank/tests specifically..

skimage/io/tests/test_imread.py

@@ -12,16 +12,16 @@
     fetch,
 )
 
-from pytest import importorskip
+import pytest
 
-importorskip('imread')
+pytest.importorskip('imread')
 
 
-def setup():
+@pytest.fixture(autouse=True)
+def _use_imread_plugin():
+    """Ensure that PIL plugin is used in tests here."""
     use_plugin('imread')
-
-
-def teardown():
+    yield
     reset_plugins()
 
 

skimage/io/tests/test_mpl_imshow.py

@@ -7,7 +7,8 @@
 plt = pytest.importorskip("matplotlib.pyplot")
 
 
-def setup():
+@pytest.fixture(autouse=True)
+def _reset_plugins():
     io.reset_plugins()
 
 

skimage/io/tests/test_plugin.py

@@ -10,11 +10,10 @@
 priority_plugin = 'pil'
 
 
-def setup():
+@pytest.fixture(autouse=True)
+def _use_pil_plugin():
     io.use_plugin('pil')
-
-
-def teardown_module():
+    yield
     io.reset_plugins()
 
 

skimage/io/tests/test_tifffile.py

@@ -8,12 +8,12 @@
 from skimage.io import imread, imsave, reset_plugins, use_plugin
 
 
-def setup():
+@pytest.fixture(autouse=True)
+def _use_tifffile_plugin():
+    """Ensure that PIL plugin is used in tests here."""
     use_plugin('tifffile')
     np.random.seed(0)
-
-
-def teardown():
+    yield
     reset_plugins()