add tests for onedns base exception

onedns/tests/test_exception.py

@@ -0,0 +1,19 @@
+from onedns import exception
+
+from testfixtures import LogCapture
+
+
+def test_onedns_exception():
+    test_msg = "test message"
+    e = exception.OneDnsException("test message")
+    assert e.msg == test_msg
+    assert e.args == (test_msg,)
+    assert str(e) == test_msg
+    assert e.explain() == 'OneDnsException: {}'.format(test_msg)
+    with LogCapture() as log_capture:
+        e.log()
+        e.log(warn=True)
+    log_capture.check(
+        ('onedns', 'ERROR', e.explain()),
+        ('onedns', 'WARNING', e.explain()),
+    )