Add several missing files

tests/base.py

@@ -0,0 +1,12 @@
+import unittest
+
+
+class TestBase(unittest.TestCase):
+
+
+    def setUp(self):
+        pass
+
+
+    def tearDown(self):
+        pass

tests/test_chain.py

@@ -0,0 +1,22 @@
+import unittest
+
+from chainlib.chain import ChainSpec
+
+from tests.base import TestBase
+
+
+class TestChain(TestBase):
+
+    def test_chain_spec(self):
+
+        s = ChainSpec.from_chain_str('foo:bar:3')
+        s = ChainSpec.from_chain_str('foo:bar:3:baz')
+
+        with self.assertRaises(ValueError):
+            s = ChainSpec.from_chain_str('foo:bar:a')
+            s = ChainSpec.from_chain_str('foo:bar')
+            s = ChainSpec.from_chain_str('foo')
+
+
+if __name__ == '__main__':
+    unittest.main()