diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..90b73db
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Execute unittests of python library
+python3 -m unittest discover -s tests -p "*_test.py"
diff --git a/tests/device_builder_test.py b/tests/device_builder_test.py
new file mode 100644
index 0000000..705596d
--- /dev/null
+++ b/tests/device_builder_test.py
@@ -0,0 +1,124 @@
+"""Unittest for device builder."""
+
+import unittest
+
+from custom_components.bluetti_bt.bluetti_bt_lib.utils.device_builder import build_device
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ac60 import AC60
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ac180 import AC180
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ac180p import AC180P
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ac200m import AC200M
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ac300 import AC300
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ac500 import AC500
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.eb3a import EB3A
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ep500 import EP500
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ep500p import EP500P
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ep600 import EP600
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ep760 import EP760
+from custom_components.bluetti_bt.bluetti_bt_lib.devices.ep800 import EP800
+
+
+class TestDeviceBuilder(unittest.TestCase):
+    def test_build_Unknow(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "PBOX56786746478"
+        with self.assertRaises(TypeError):
+            build_device(bt_addr, bt_name)
+
+    def test_build_ac60(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "AC6056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, AC60)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ac180(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "AC18056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, AC180)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ac180p(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "AC180P56786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, AC180P)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ac200m(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "AC200M56786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, AC200M)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ac300(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "AC30056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, AC300)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ac500(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "AC50056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, AC500)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_eb3a(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "EB3A56786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, EB3A)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ep500(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "EP50056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, EP500)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_ep500p(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "EP500P56786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, EP500P)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_EP600(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "EP60056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, EP600)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_EP760(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "EP76056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, EP760)
+        self.assertEqual(built.address, bt_addr)
+
+    def test_build_EP800(self):
+        bt_addr = "aa:bb:cc:dd:ee:ff"
+        bt_name = "EP80056786746478"
+        built = build_device(bt_addr, bt_name)
+
+        self.assertIsInstance(built, EP800)
+        self.assertEqual(built.address, bt_addr)
+
+if __name__ == '__main__':
+    unittest.main()