[PATCH] kunit: tool: Assert version requirement

[SeongJae Park <sj38.park@gmail.com>]

From: SeongJae Park <sjpark@amazon.de>

Commit 87c9c1631788 ("kunit: tool: add support for QEMU") on the 'next'
tree adds 'from __future__ import annotations' in 'kunit_kernel.py'.
Because it is supported on only >=3.7 Python, people using older Python
will get below error:

    Traceback (most recent call last):
      File "./tools/testing/kunit/kunit.py", line 20, in <module>
        import kunit_kernel
      File "/home/sjpark/linux/tools/testing/kunit/kunit_kernel.py", line 9
        from __future__ import annotations
        ^
    SyntaxError: future feature annotations is not defined

This commit adds a version assertion in 'kunit.py', so that people get
more explicit error message like below:

   Traceback (most recent call last):
      File "./tools/testing/kunit/kunit.py", line 15, in <module>
        assert sys.version_info >= (3, 7)
    AssertionError

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
 tools/testing/kunit/kunit.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index be8d8d4a4e08..748d88178506 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -12,6 +12,8 @@ import sys
 import os
 import time
 
+assert sys.version_info >= (3, 7)
+
 from collections import namedtuple
 from enum import Enum, auto
 
-- 
2.17.1