Expand parser tests to achieve complete coverage

Author: linuxdaemon

.coveragerc

@@ -0,0 +1,12 @@
+[report]
+exclude_lines =
+    pragma: no cover
+    def __repr__
+    raise AssertionError
+    raise NotImplementedError
+    if __name__ == .__main__.:
+
+[run]
+omit =
+    tests/data/*
+    tests/util/*