Coverage: Exclude few lines from coverage

.coveragerc

@@ -1,4 +1,26 @@
 [run]
+branch = True
 omit =
     # omit generated UI code
     *_ui.py
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # 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 False:
+
+    # Don't complain about abstract methods, they aren't run:
+    @(abc\.)?abstractmethod
+
+    # Don't complain about type checking imports
+    if TYPE_CHECKING:
+    if typing\.TYPE_CHECKING: