test: a part-covered comprehension

The comprehension would only completely finish (->exit) if the assert
was going to fail.  So we expect it to not finish.

metacov.ini

@@ -78,7 +78,6 @@ partial_branches =
     pragma: part covered
     # A for-loop that always hits its break statement
     pragma: always breaks
-    pragma: if failure
     pragma: part started
     if env.TESTING:
     if env.METACOV:

tests/test_execfile.py

@@ -4,13 +4,11 @@
 """Tests for coverage.execfile"""
 
 import compileall
-import fnmatch
 import json
 import os
 import os.path
 import pathlib
 import re
-import sys
 
 import pytest
 
@@ -107,7 +105,7 @@ def test_directory_without_main(self):
 class RunPycFileTest(CoverageTest):
     """Test cases for `run_python_file`."""
 
-    def make_pyc(self):                     # pylint: disable=inconsistent-return-statements
+    def make_pyc(self):
         """Create a .pyc file, and return the path to it."""
         if env.JYTHON:
             pytest.skip("Can't make .pyc files on Jython")

tests/test_plugins.py

@@ -657,7 +657,8 @@ def run_bad_plugin(self, module_name, plugin_name, our_error=True, excmsg=None,
         if excmsg:
             assert excmsg in stderr
         if excmsgs:
-            assert any(em in stderr for em in excmsgs), f"expected one of {excmsgs} in stderr"
+            found_exc = any(em in stderr for em in excmsgs)             #  pragma: part covered
+            assert found_exc, f"expected one of {excmsgs} in stderr"
 
     def test_file_tracer_has_no_file_tracer_method(self):
         self.make_file("bad_plugin.py", """\