Exclude test coverage in defensive lines

.coveragerc

@@ -0,0 +1,28 @@
+# .coveragerc to control coverage.py
+[run]
+branch = True
+
+omit =
+    setup.py
+
+[report]
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code:
+    def __repr__
+    if self\.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+ignore_errors = True
+
+
+# vim:filetype=dosini

.travis.yml

@@ -9,7 +9,7 @@ install:
   - pip install -r requirements.txt
   - pip install coveralls
 script:
-  - coverage run --source='.' -m py.test -vv --runslow
+  - coverage run --rcfile=.coveragerc --source='.' -m py.test -vv --runslow
   - coverage report -m
 after_success:
   - coveralls

astrality/astrality.py

@@ -99,7 +99,7 @@ def exit_handler(signal=None, frame=None) -> None:
                     module_manager.time_until_next_period().total_seconds()
                 )
 
-    except KeyboardInterrupt:
+    except KeyboardInterrupt:  # pragma: no cover
         exit_handler()
 
 def other_astrality_pids() -> Set[int]:

astrality/config.py

@@ -20,7 +20,7 @@
 try:
     from yaml import CLoader as Loader, CDumper as Dumper  # type: ignore
     logger.info('Using LibYAML bindings for faster .yaml parsing.')
-except ImportError:
+except ImportError:  # pragma: no cover
     from yaml import Loader, Dumper
     logger.warning(
         'LibYAML not installed.'
@@ -96,7 +96,7 @@ def dict_from_config_file(
     containing all the environment variables.
     """
 
-    if not config_file.is_file():
+    if not config_file.is_file():  # pragma: no cover
         error_msg = f'Could not load config file "{config_file}".'
         logger.critical(error_msg)
         raise RuntimeError(error_msg)

conftest.py

@@ -13,7 +13,8 @@ def pytest_collection_modifyitems(config, items):
     if config.getoption("--runslow"):
         # --runslow given in cli: do not skip slow tests
         return
-    skip_slow = pytest.mark.skip(reason="need --runslow option to run")
-    for item in items:
-        if "slow" in item.keywords:
-            item.add_marker(skip_slow)
+    else:  # pragma: no cover
+        skip_slow = pytest.mark.skip(reason="need --runslow option to run")
+        for item in items:
+            if "slow" in item.keywords:
+                item.add_marker(skip_slow)