diff --git a/modules/class_heatpump.py b/modules/class_heatpump.py
index fc1b776..60321b9 100644
--- a/modules/class_heatpump.py
+++ b/modules/class_heatpump.py
@@ -1,10 +1,5 @@
-import json
-from datetime import datetime, timedelta, timezone
-import numpy as np
-from pprint import pprint
 
-
-class Waermepumpe:
+class Heatpump:
     MAX_HEIZLEISTUNG = 5000  # Maximum heating power in watts
     BASE_HEIZLEISTUNG = 235.0  # Base heating power value
     TEMPERATURE_COEFFICIENT = -11.645  # Coefficient for temperature
@@ -48,7 +43,7 @@ if __name__ == '__main__':
     start_innentemperatur = 15  # Initial indoor temperature
     isolationseffizienz = 0.8  # Insulation efficiency
     gewuenschte_innentemperatur = 20  # Desired indoor temperature
-    wp = Waermepumpe(max_heizleistung, 24)  # Initialize heat pump with prediction hours
+    wp = Heatpump(max_heizleistung, 24)  # Initialize heat pump with prediction hours
 
     # Print COP for various outside temperatures
     print(wp.cop_berechnen(-10), " ", wp.cop_berechnen(0), " ", wp.cop_berechnen(10))
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..f9ddc40
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1 @@
+pytest==8.3.3
\ No newline at end of file
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..91c9a65
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1 @@
+from test_heatpump import heatpump
\ No newline at end of file
diff --git a/tests/test_heatpump.py b/tests/test_heatpump.py
new file mode 100644
index 0000000..81c0f34
--- /dev/null
+++ b/tests/test_heatpump.py
@@ -0,0 +1,16 @@
+import pytest
+from modules.class_heatpump import Heatpump
+
+
+@pytest.fixture(scope='function')
+def heatpump() -> Heatpump:
+    """ Heatpump with 5 kw heating power and 24 h prediction
+    """
+    return Heatpump(5000, 24)
+
+class TestHeatpump:
+    def test_cop(self, heatpump):
+        """Testing calculate COP for variouse outside temperatures"""
+        assert heatpump.cop_berechnen(-10) == 2.0, "COP for -10 degree isn't correct"
+        assert heatpump.cop_berechnen(0) == 3.0, "COP for 0 degree isn't correct"
+        assert heatpump.cop_berechnen(10) == 4.0, "COP for 10 degree isn't correct"