diff --git a/src/infi/clickhouse_orm/engines.py b/src/infi/clickhouse_orm/engines.py
index 7c9a94c..c26b451 100644
--- a/src/infi/clickhouse_orm/engines.py
+++ b/src/infi/clickhouse_orm/engines.py
@@ -9,6 +9,7 @@ class MergeTree(Engine):
 
     def __init__(self, date_col, key_cols, sampling_expr=None,
                  index_granularity=8192, replica_table_path=None, replica_name=None):
+        assert type(key_cols) in (list, tuple), 'key_cols must be a list or tuple'
         self.date_col = date_col
         self.key_cols = key_cols
         self.sampling_expr = sampling_expr
@@ -54,6 +55,7 @@ class SummingMergeTree(MergeTree):
     def __init__(self, date_col, key_cols, summing_cols=None, sampling_expr=None,
                  index_granularity=8192, replica_table_path=None, replica_name=None):
         super(SummingMergeTree, self).__init__(date_col, key_cols, sampling_expr, index_granularity, replica_table_path, replica_name)
+        assert type is None or type(summing_cols) in (list, tuple), 'summing_cols must be a list or tuple'
         self.summing_cols = summing_cols
 
     def _build_sql_params(self):
@@ -63,6 +65,20 @@ class SummingMergeTree(MergeTree):
         return params
 
 
+class ReplacingMergeTree(MergeTree):
+
+    def __init__(self, date_col, key_cols, ver_col=None, sampling_expr=None,
+                 index_granularity=8192, replica_table_path=None, replica_name=None):
+        super(ReplacingMergeTree, self).__init__(date_col, key_cols, sampling_expr, index_granularity, replica_table_path, replica_name)
+        self.ver_col = ver_col
+
+    def _build_sql_params(self):
+        params = super(ReplacingMergeTree, self)._build_sql_params()
+        if self.ver_col:
+            params.append(self.ver_col)
+        return params
+
+
 class Buffer(Engine):
     """Here we define Buffer engine
     Read more here https://clickhouse.yandex/reference_en.html#Buffer
diff --git a/tests/test_engines.py b/tests/test_engines.py
new file mode 100644
index 0000000..d3d8865
--- /dev/null
+++ b/tests/test_engines.py
@@ -0,0 +1,64 @@
+import unittest
+
+from infi.clickhouse_orm.database import Database, DatabaseException
+from infi.clickhouse_orm.models import Model
+from infi.clickhouse_orm.fields import *
+from infi.clickhouse_orm.engines import *
+
+import logging
+logging.getLogger("requests").setLevel(logging.WARNING)
+
+
+class EnginesTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.database = Database('test-db')
+
+    def tearDown(self):
+        self.database.drop_database()
+
+    def _create_and_insert(self, model_class):
+        self.database.create_table(model_class)
+        self.database.insert([
+            model_class(date='2017-01-01', event_id=23423, event_group=13, event_count=7, event_version=1)
+        ])
+
+    def test_merge_tree(self):
+        class TestModel(SampleModel):
+            engine = MergeTree('date', ('date', 'event_id', 'event_group'))
+        self._create_and_insert(TestModel)
+
+    def test_merge_tree_with_sampling(self):
+        class TestModel(SampleModel):
+            engine = MergeTree('date', ('date', 'event_id', 'event_group'), sampling_expr='intHash32(event_id)')
+        self._create_and_insert(TestModel)
+
+    def test_merge_tree_with_granularity(self):
+        class TestModel(SampleModel):
+            engine = MergeTree('date', ('date', 'event_id', 'event_group'), index_granularity=4096)
+        self._create_and_insert(TestModel)
+
+    def test_collapsing_merge_tree(self):
+        class TestModel(SampleModel):
+            engine = CollapsingMergeTree('date', ('date', 'event_id', 'event_group'), 'event_version')
+        self._create_and_insert(TestModel)
+
+    def test_summing_merge_tree(self):
+        class TestModel(SampleModel):
+            engine = SummingMergeTree('date', ('date', 'event_group'), ('event_count',))
+        self._create_and_insert(TestModel)
+
+    def test_replacing_merge_tree(self):
+        class TestModel(SampleModel):
+            engine = ReplacingMergeTree('date', ('date', 'event_id', 'event_group'), 'event_uversion')
+        self._create_and_insert(TestModel)
+
+
+class SampleModel(Model):
+
+    date            = DateField()
+    event_id        = UInt32Field()
+    event_group     = UInt32Field()
+    event_count     = UInt16Field()
+    event_version   = Int8Field()
+    event_uversion  = UInt8Field(materialized='abs(event_version)')