add codecov config, add test for version parsing, mode module docstring

.codecov.yml

@@ -0,0 +1,7 @@
+coverage:
+  range: 50..90
+  round: down
+  precision: 0
+
+comment:
+  layout: "diff, files"

idesolver/__init__.py

@@ -1,3 +1,10 @@
+"""
+A general purpose integro-differential equation (IDE) solver.
+
+Copyright (C) 2017-2019  Joshua T Karpel
+Full license available at github.com/JoshKarpel/LICENSE
+"""
+
 from .idesolver import *
 from .exceptions import *
 from .version import __version__, version_info

idesolver/idesolver.py

@@ -1,10 +1,3 @@
-"""
-A general purpose integro-differential equation (IDE) solver.
-
-Copyright (C) 2017-2019  Joshua T Karpel
-Full license available at github.com/JoshKarpel/LICENSE
-"""
-
 from typing import Union, Optional, Callable
 import warnings
 import logging

tests/test_version.py

@@ -0,0 +1,18 @@
+import pytest
+
+from idesolver.version import _version_info
+
+@pytest.mark.parametrize(
+    'version, expected',
+    [
+        ('0.1.0', (0, 1, 0, None, None)),
+        ('0.1.0a5', (0, 1, 0, 'a', 5)),
+        ('2.4.3', (2, 4, 3, None, None)),
+        ('2.4.3b3', (2, 4, 3, 'b', 3)),
+        ('12.44.33', (12, 44, 33, None, None)),
+        ('12.44.33b99', (12, 44, 33, 'b', 99)),
+        ('12.44.33post1', (12, 44, 33, 'post', 1)),
+    ]
+)
+def test_version_info(version, expected):
+    assert _version_info(version) == expected