ENH: skip eps_writer test if 'tex' executable isn't installed

yt/testing.py

@@ -7,6 +7,7 @@
 import shutil
 import tempfile
 import unittest
+from shutil import which
 
 import matplotlib
 import numpy as np
@@ -1364,6 +1365,29 @@ def ftrue(func):
  return ffalse
 
 
+def requires_external_executable(*names):
+ import pytest
+
+ def deco(func):
+ missing = []
+ for name in names:
+ if which(name) is None:
+ missing.append(name)
+
+ # note that order between these two decorators matters
+ @pytest.mark.skipif(
+ missing,
+ reason=f"missing external executable(s): {', '.join(missing)}",
+ )
+ @functools.wraps(func)
+ def inner_func(*args, **kwargs):
+ return func(*args, **kwargs)
+
+ return inner_func
+
+ return deco
+
+
 class TempDirTest(unittest.TestCase):
  """
  A test class that runs in a temporary directory and

yt/visualization/tests/test_eps_writer.py

@@ -1,7 +1,8 @@
 import yt
-from yt.testing import fake_amr_ds, requires_module
+from yt.testing import fake_amr_ds, requires_external_executable, requires_module
 
 
+@requires_external_executable("tex")
 @requires_module("pyx")
 def test_eps_writer(tmp_path):
  import yt.visualization.eps_writer as eps