unittest: Remove dependence on sys.exc_info.

This is not included by default in most builds, and isn't necessary for this module anyway. Also fix the local variable shadowing the traceback module in _capture_exc. Added test for both (works on CPython and MicroPython). Version bump to 0.10.2. Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Author: Andrzej Kowalczyk

python-stdlib/unittest/manifest.py

@@ -1,3 +1,3 @@
-metadata(version="0.10.1")
+metadata(version="0.10.2")
 
 package("unittest")

python-stdlib/unittest/tests/test_exception.py

@@ -0,0 +1,13 @@
+import unittest
+
+
+def broken_func():
+ raise ValueError("uh oh!")
+
+
+def test_func():
+ broken_func()
+
+
+if __name__ == "__main__":
+ unittest.main()

python-stdlib/unittest/unittest/__init__.py

@@ -332,12 +332,12 @@ def __add__(self, other):
  return self
 
 
-def _capture_exc(exc, traceback):
+def _capture_exc(exc, exc_traceback):
  buf = io.StringIO()
  if hasattr(sys, "print_exception"):
  sys.print_exception(exc, buf)
  elif traceback is not None:
- traceback.print_exception(None, exc, traceback, file=buf)
+ traceback.print_exception(None, exc, exc_traceback, file=buf)
  return buf.getvalue()
 
 
@@ -402,7 +402,7 @@ def run_one(test_function):
  test_result.skipped.append((name, c, reason))
  except Exception as ex:
  _handle_test_exception(
- current_test=(name, c), test_result=test_result, exc_info=sys.exc_info()
+ current_test=(name, c), test_result=test_result, exc_info=(type(ex), ex, None)
  )
  # Uncomment to investigate failure in detail
  # raise