WIP Add file backend

tests/test_file.py

@@ -0,0 +1,60 @@
+# standard imports
+import uuid
+import os
+import unittest
+import shutil
+
+# external imports
+from chainlib.chain import ChainSpec
+
+# local imports
+from chainsyncer.backend_file import SyncerFileBackend
+
+script_dir = os.path.dirname(__file__)
+tmp_test_dir = os.path.join(script_dir, 'testdata', 'tmp') 
+chainsyncer_test_dir = os.path.join(tmp_test_dir, 'chainsyncer')
+os.makedirs(tmp_test_dir, exist_ok=True)
+
+
+class TestFile(unittest.TestCase):
+
+    def setUp(self):
+        self.chain_spec = ChainSpec('foo', 'bar', 42, 'baz')
+        self.uu = SyncerFileBackend.create_object(self.chain_spec, None, base_dir=tmp_test_dir)
+
+        self.o = SyncerFileBackend(self.chain_spec, self.uu, base_dir=tmp_test_dir)
+
+
+    def tearDown(self):
+        self.o.purge()
+        shutil.rmtree(chainsyncer_test_dir)
+
+
+    def test_set(self):
+        self.o.set(42, 13)
+
+        o = SyncerFileBackend(self.chain_spec, self.o.object_id, base_dir=tmp_test_dir)
+
+        state = o.get()
+
+        self.assertEqual(state[0], 42)
+        self.assertEqual(state[1], 13)
+
+
+    def test_initial(self):
+        local_uu = SyncerFileBackend.initial(self.chain_spec, 1337, start_block_height=666, base_dir=tmp_test_dir)
+
+        o = SyncerFileBackend(self.chain_spec, local_uu, base_dir=tmp_test_dir)
+
+        (pair, filter_stats) = o.target()
+        self.assertEqual(pair[0], 1337)
+        self.assertEqual(pair[1], 0)
+
+        (pair, filter_stats) = o.start()
+        self.assertEqual(pair[0], 666)
+        self.assertEqual(pair[1], 0)
+
+
+
+if __name__ == '__main__':
+    unittest.main()