TST: Backports from GH-3743

Author: neutrinoceros

conftest.py

@@ -4,8 +4,10 @@
 from importlib.util import find_spec
 from pathlib import Path
 
+import matplotlib
 import pytest
 import yaml
+from packaging.version import Version
 
 from yt.config import ytcfg
 from yt.utilities.answer_testing.testing_utilities import (
@@ -17,6 +19,8 @@
     data_dir_load,
 )
 
+MPL_VERSION = Version(matplotlib.__version__)
+
 
 def pytest_addoption(parser):
     """
@@ -109,22 +113,26 @@ def pytest_configure(config):
     ):
         config.addinivalue_line("filterwarnings", value)
 
-    # at the time of writing, astropy's wheels are behind numpy's latest
-    # version but this doesn't cause actual problems in our test suite, so
-    # we allow this warning to pass.
-    # last checked with astropy 4.2.1
-    config.addinivalue_line(
-        "filterwarnings",
-        (
-            "ignore:numpy.ndarray size changed, may indicate binary incompatibility. "
-            "Expected 80 from C header, got 88 from PyObject:RuntimeWarning"
-        ),
-    )
+    if MPL_VERSION < Version("3.0.0"):
+        config.addinivalue_line(
+            "filterwarnings",
+            (
+                "ignore:Using or importing the ABCs from 'collections' instead of from 'collections.abc' "
+                "is deprecated since Python 3.3,and in 3.9 it will stop working:DeprecationWarning"
+            ),
+        )
+
     if find_spec("astropy") is not None:
-        # astropy triggers this warning from itself, there's not much we can do on our side
-        # last checked with astropy 4.2.1
+        # at the time of writing, astropy's wheels are behind numpy's latest
+        # version but this doesn't cause actual problems in our test suite
+        # last updated with astropy 5.0 + numpy 1.22 + pytest 6.2.5
         config.addinivalue_line(
-            "filterwarnings", "ignore::astropy.wcs.wcs.FITSFixedWarning"
+            "filterwarnings",
+            (
+                "ignore:numpy.ndarray size changed, may indicate binary incompatibility. Expected "
+                r"(80 from C header, got 88|88 from C header, got 96|80 from C header, got 96)"
+                " from PyObject:RuntimeWarning"
+            ),
         )
 
     if find_spec("cartopy") is not None: