diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/core/__init__.py b/core/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/core/base/ResultBase.py b/core/base/ResultBase.py
new file mode 100644
index 0000000..e1abbce
--- /dev/null
+++ b/core/base/ResultBase.py
@@ -0,0 +1,2 @@
+class ResultBase():
+    pass
diff --git a/core/base/SimulationBase.py b/core/base/SimulationBase.py
new file mode 100644
index 0000000..fa985b5
--- /dev/null
+++ b/core/base/SimulationBase.py
@@ -0,0 +1,9 @@
+import abc
+
+
+class SimulationBase():
+    @abc.abstractclassmethod
+    def run(self):
+        pass
+
+    pass
diff --git a/core/base/__init__.py b/core/base/__init__.py
new file mode 100644
index 0000000..da7f6e8
--- /dev/null
+++ b/core/base/__init__.py
@@ -0,0 +1,2 @@
+from .ResultBase import ResultBase
+from .SimulationBase import SimulationBase
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_base.py b/tests/test_base.py
new file mode 100644
index 0000000..204fc17
--- /dev/null
+++ b/tests/test_base.py
@@ -0,0 +1,18 @@
+import unittest
+
+from haocrowd.core.base import SimulationBase
+
+
+class TestBase(unittest.TestCase):
+
+    def test_basic(self):
+        class MySim(SimulationBase):
+            def run(self) -> str:
+                return "HelloSim"
+
+        mysim = MySim()
+        self.assertEqual(mysim.run(), "HelloSim")
+
+
+if __name__ == "__main__":
+    unittest.main()