diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..d769d17
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,15 @@
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # 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 False:
+    if __name__ == .__main__.: