tests: Set __tracebackhide__ to a callable

This allows us to only filter the exceptions we actually want to hide.

See #1877

tests/end2end/fixtures/quteprocess.py

@@ -295,6 +295,8 @@ class QuteProc(testprocess.Process):
 
     def wait_for(self, timeout=None, **kwargs):
         """Extend wait_for to add divisor if a test is xfailing."""
+        __tracebackhide__ = (lambda e:
+                             e.errisinstance(testprocess.WaitForTimeout))
         xfail = self.request.node.get_marker('xfail')
         if xfail and xfail.args[0]:
             kwargs['divisor'] = 10
@@ -347,7 +349,7 @@ class QuteProc(testprocess.Process):
 
     def after_test(self):
         """Handle unexpected/skip logging and clean up after each test."""
-        __tracebackhide__ = True
+        __tracebackhide__ = lambda e: e.errisinstance(pytest.fail.Exception)
         bad_msgs = [msg for msg in self._data
                     if self._is_error_logline(msg) and not msg.expected]
 
@@ -464,7 +466,8 @@ class QuteProc(testprocess.Process):
     def wait_for_load_finished_url(self, url, *, timeout=None,
                                    load_status='success'):
         """Wait until a URL has finished loading."""
-        __tracebackhide__ = True
+        __tracebackhide__ = (lambda e: e.errisinstance(
+            testprocess.WaitForTimeout))
 
         if timeout is None:
             if 'CI' in os.environ:
@@ -496,7 +499,8 @@ class QuteProc(testprocess.Process):
     def wait_for_load_finished(self, path, *, port=None, https=False,
                                timeout=None, load_status='success'):
         """Wait until a path has finished loading."""
-        __tracebackhide__ = True
+        __tracebackhide__ = (lambda e: e.errisinstance(
+            testprocess.WaitForTimeout))
         url = self.path_to_url(path, port=port, https=https)
         self.wait_for_load_finished_url(url, timeout=timeout,
                                         load_status=load_status)
@@ -562,7 +566,7 @@ class QuteProc(testprocess.Process):
         partial_compare is used, which means only the keys/values listed will
         be compared.
         """
-        __tracebackhide__ = True
+        __tracebackhide__ = lambda e: e.errisinstance(pytest.fail.Exception)
         # Translate ... to ellipsis in YAML.
         loader = yaml.SafeLoader(expected)
         loader.add_constructor('!ellipsis', lambda loader, node: ...)

tests/end2end/fixtures/testprocess.py

@@ -279,7 +279,7 @@ class Process(QObject):
         Also checks self._invalid so the test counts as failed if there were
         unexpected output lines earlier.
         """
-        __tracebackhide__ = True
+        __tracebackhide__ = lambda e: e.errisinstance(ProcessExited)
         self.captured_log = []
         if self._invalid:
             # Wait for a bit so the full error has a chance to arrive
@@ -338,7 +338,6 @@ class Process(QObject):
 
         Return: either the found line or None.
         """
-        __tracebackhide__ = True
         for line in self._data:
             matches = []
 
@@ -362,7 +361,7 @@ class Process(QObject):
 
         Called via wait_for.
         """
-        __tracebackhide__ = True
+        __tracebackhide__ = lambda e: e.errisinstance(WaitForTimeout)
         message = kwargs.get('message', None)
         if message is not None:
             elided = quteutils.elide(repr(message), 50)
@@ -441,7 +440,7 @@ class Process(QObject):
         Return:
             The matched line.
         """
-        __tracebackhide__ = True
+        __tracebackhide__ = lambda e: e.errisinstance(WaitForTimeout)
 
         if timeout is None:
             if do_skip:
@@ -471,7 +470,7 @@ class Process(QObject):
         If nothing is found in the log, we wait for delay ms to make sure
         nothing arrives.
         """
-        __tracebackhide__ = True
+        __tracebackhide__ = lambda e: e.errisinstance(BlacklistedMessageError)
         try:
             line = self.wait_for(timeout=delay, override_waited_for=True,
                                  **kwargs)