adding corresponding test, authors and changelog

AUTHORS

@@ -91,6 +91,7 @@ Martin Prusse
 Matt Bachmann
 Matt Williams
 Matthias Hafner
+mbyt
 Michael Aquilina
 Michael Birtwell
 Michael Droettboom

CHANGELOG.rst

@@ -12,13 +12,20 @@
 * Fix ``UnicodeEncodeError`` when string comparison with unicode has failed. (`#1864`_)
   Thanks `@AiOO`_ for the PR
 
+* Do not call tearDown (and cleanups) when running unittest with ``--pdb``
+  enabled. This allows proper post mortem debugging for all applications
+  which have significant logic in their tearDown method (`#1890`_). Thanks
+  `@mbyt`_ for the PR.
+
 *
 
 .. _@joguSD: https://github.com/joguSD
 .. _@AiOO: https://github.com/AiOO
+.. _@mbyt: https://github.com/mbyt
 
 .. _#1857: https://github.com/pytest-dev/pytest/issues/1857
 .. _#1864: https://github.com/pytest-dev/pytest/issues/1864
+.. _#1890: https://github.com/pytest-dev/pytest/issues/1890
 
 
 3.0.1

testing/test_pdb.py

@@ -79,6 +79,25 @@ class TestPDB:
         if child.isalive():
             child.wait()
 
+    def test_pdb_unittest_postmortem(self, testdir):
+        p1 = testdir.makepyfile("""
+            import unittest
+            class Blub(unittest.TestCase):
+                def tearDown(self):
+                    self.filename = None
+                def test_false(self):
+                    self.filename = 'bla' + '.txt'
+                    assert 0
+        """)
+        child = testdir.spawn_pytest("--pdb %s" % p1)
+        child.expect('(Pdb)')
+        child.sendline('p self.filename')
+        child.sendeof()
+        rest = child.read().decode("utf8")
+        assert 'bla.txt' in rest
+        if child.isalive():
+            child.wait()
+
     def test_pdb_interaction_capture(self, testdir):
         p1 = testdir.makepyfile("""
             def test_1():