TST: Replace calls to unittest.TestCase.fail (#11933)

After the pytest migration, test classes no longer inherit
from unittest.TestCase and and the fail method does not
exist anymore.

In all these cases, we can use assert_raises and assert_raises_regex instead

1 files changed, 4 insertions, 6 deletions

diff --git a/numpy/lib/tests/test_format.py b/numpy/lib/tests/test_format.py
index c7869c582..af64dd043 100644
--- a/numpy/lib/tests/test_format.py
+++ b/numpy/lib/tests/test_format.py
@@ -286,7 +286,8 @@ from io import BytesIO
 
 import numpy as np
 from numpy.testing import (
-    assert_, assert_array_equal, assert_raises, raises, SkipTest
+    assert_, assert_array_equal, assert_raises, assert_raises_regex,
+    raises, SkipTest
     )
 from numpy.lib import format
 
@@ -678,12 +679,9 @@ def test_write_version():
         (255, 255),
     ]
     for version in bad_versions:
-        try:
+        with assert_raises_regex(ValueError,
+                                 'we only support format version.*'):
             format.write_array(f, arr, version=version)
-        except ValueError:
-            pass
-        else:
-            raise AssertionError("we should have raised a ValueError for the bad version %r" % (version,))
 
 
 bad_version_magic = [