Force GC run in tests that want clean up.

Some of these worked (by fluke?) in CPython, but didn't work in PyPy.
The NumPy function ensures GC is run enough times on PyPy to be really
cleared.

Author: QuLogic

lib/matplotlib/tests/test_animation.py

@@ -1,4 +1,3 @@
-import gc
 import os
 from pathlib import Path
 import subprocess
@@ -90,7 +89,7 @@ def test_animation_delete(anim):
     anim = animation.FuncAnimation(**anim)
     with pytest.warns(Warning, match='Animation was deleted'):
         del anim
-        gc.collect()
+        np.testing.break_cycles()
 
 
 def test_movie_writer_dpi_default():
@@ -214,7 +213,8 @@ def test_animation_repr_html(writer, html, want, anim):
     if want is None:
         assert html is None
         with pytest.warns(UserWarning):
-            del anim  # Animtion was never run, so will warn on cleanup.
+            del anim  # Animation was never run, so will warn on cleanup.
+            np.testing.break_cycles()
     else:
         assert want in html
 
@@ -324,6 +324,7 @@ def frames_generator():
     writer = NullMovieWriter()
     anim.save('unused.null', writer=writer)
     assert len(frames_generated) == 5
+    np.testing.break_cycles()
     for f in frames_generated:
         # If cache_frame_data is True, then the weakref should be alive;
         # if cache_frame_data is False, then the weakref should be dead (None).

lib/matplotlib/tests/test_cbook.py

@@ -198,11 +198,13 @@ def count(self):
         return count1
 
     def is_empty(self):
+        np.testing.break_cycles()
         assert self.callbacks._func_cid_map == {}
         assert self.callbacks.callbacks == {}
         assert self.callbacks._pickled_cids == set()
 
     def is_not_empty(self):
+        np.testing.break_cycles()
         assert self.callbacks._func_cid_map != {}
         assert self.callbacks.callbacks != {}
 

lib/matplotlib/tests/test_style.py

@@ -1,9 +1,9 @@
 from contextlib import contextmanager
-import gc
 from pathlib import Path
 from tempfile import TemporaryDirectory
 import sys
 
+import numpy as np
 import pytest
 
 import matplotlib as mpl
@@ -165,7 +165,7 @@ def test_xkcd_no_cm():
     assert mpl.rcParams["path.sketch"] is None
     plt.xkcd()
     assert mpl.rcParams["path.sketch"] == (1, 100, 2)
-    gc.collect()
+    np.testing.break_cycles()
     assert mpl.rcParams["path.sketch"] == (1, 100, 2)