[New-bugs-announce] [issue37606] Improve test_dtrace.py

[hai shi]

New submission from hai shi <shihai1991 at 126.com>:

$ ./python -m unittest test.test_dtrace
ssssE
======================================================================
ERROR: setUpClass (test.test_dtrace.TraceTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/shihai/workspace/cpython/Lib/test/test_dtrace.py", line 110, in setUpClass
    self.backend.assert_usable()
AttributeError: 'NoneType' object has no attribute 'assert_usable'

----------------------------------------------------------------------
Ran 0 tests in 0.008s

FAILED (errors=1, skipped=4)

----------
components: Tests
messages: 348029
nosy: shihai1991
priority: normal
severity: normal
status: open
title: Improve test_dtrace.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37606>
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