Wrap ex in new test, change dir helpers to use `pathlib.Path`

tests/conftest.py

@@ -7,6 +7,7 @@ import os
 import random
 import signal
 import platform
+import pathlib
 import time
 import inspect
 from functools import partial, wraps
@@ -113,14 +114,21 @@ no_windows = pytest.mark.skipif(
 )
 
 
-def repodir():
-    """Return the abspath to the repo directory.
-    """
-    dirname = os.path.dirname
-    dirpath = os.path.abspath(
-        dirname(dirname(os.path.realpath(__file__)))
-        )
-    return dirpath
+def repodir() -> pathlib.Path:
+    '''
+    Return the abspath to the repo directory.
+
+    '''
+    # 2 parents up to step up through tests/<repo_dir>
+    return pathlib.Path(__file__).parent.parent.absolute()
+
+
+def examples_dir() -> pathlib.Path:
+    '''
+    Return the abspath to the examples directory as `pathlib.Path`.
+
+    '''
+    return repodir() / 'examples'
 
 
 def pytest_addoption(parser):

tests/test_advanced_faults.py

@@ -0,0 +1,38 @@
+'''
+Sketchy network blackoutz, ugly byzantine gens, puedes eschuchar la
+cancelacion?..
+
+'''
+import pytest
+from _pytest.pathlib import import_path
+import trio
+
+from conftest import (
+    examples_dir,
+)
+
+
+@pytest.mark.parametrize(
+    'debug_mode',
+    [False, True],
+    ids=['debug_mode', 'no_debug_mode'],
+)
+def test_child_breaks_ipc_channel_during_stream(
+    debug_mode: bool,
+):
+    '''
+    Ensure we can (purposely) break IPC during streaming and it's still
+    possible for the (simulated) user to kill the actor tree using
+    SIGINT.
+
+    '''
+    mod = import_path(
+        examples_dir() / 'advanced_faults' / 'ipc_failure_during_stream.py',
+        root=examples_dir(),
+    )
+
+    with pytest.raises(KeyboardInterrupt):
+        trio.run(
+            mod.main,
+            debug_mode,
+        )