diff --git a/Jenkinsfile b/Jenkinsfile
index 73a2c0f..ce6010b 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -12,19 +12,43 @@ pipeline{
             }
         }
         stage('Test') {
-            agent {
-                docker {
-                    image 'qnib/pytest'
+
+            parallel {
+                stage('on centos') {
+                    agent {
+                        docker {
+                            image 'qnib/pytest'
+                        }
+                    }
+                    steps {
+                        sh 'py.test --verbose --junit-xml test-reports/results.xml sources/test_calc.py || true'
+                    }
+                    post {
+                        always {
+                            junit 'test-reports/results.xml'
+                        }
+                    }
                 }
-            }
-            steps {
-                sh 'py.test --verbose --junit-xml test-reports/results.xml sources/test_calc.py || true'
-            }
-            post {
-                always {
-                    junit 'test-reports/results.xml'
+                stage('on debian') {
+                    agent {
+                        docker {
+                            image 'qnib/pytest'
+                        }
+                    }
+                    steps {
+                        sh 'py.test --verbose --junit-xml test-reports/results.xml sources/test_calc2.py || true'
+                    }
+                    post {
+                        always {
+                            junit 'test-reports/results.xml'
+                        }
+                    }
                 }
-            }
+//            steps {
+//                sh 'py.test --verbose --junit-xml test-reports/results.xml sources/test_calc.py || true'
+//            }
+
+        }
         }
         stage('Deliver') {
             agent {
diff --git a/sources/test_calc.py b/sources/test_calc.py
index 58f3ffc..fe0cbbf 100644
--- a/sources/test_calc.py
+++ b/sources/test_calc.py
@@ -8,27 +8,27 @@ class TestCalc(unittest.TestCase):
     # def test_fail(self):
     #     self.assertFalse(True, msg="This is failed test")
 
-    def test_add_integers(self):
-        """
-        Test that the addition of two integers returns the correct total
-        """
-        result = calc.add2(1, 2)
-        self.assertEqual(result, 3)
-
-    def test_add_floats(self):
-        """
-        Test that the addition of two floats returns the correct result
-        """
-        result = calc.add2('10.5', 2)
-        self.assertEqual(result, 12.5)
-
-    def test_add_strings(self):
-        """
-        Test the addition of two strings returns the two strings as one
-        concatenated string
-        """
-        result = calc.add2('abc', 'def')
-        self.assertEqual(result, 'abcdef')
+    # def test_add_integers(self):
+    #     """
+    #     Test that the addition of two integers returns the correct total
+    #     """
+    #     result = calc.add2(1, 2)
+    #     self.assertEqual(result, 3)
+    #
+    # def test_add_floats(self):
+    #     """
+    #     Test that the addition of two floats returns the correct result
+    #     """
+    #     result = calc.add2('10.5', 2)
+    #     self.assertEqual(result, 12.5)
+    #
+    # def test_add_strings(self):
+    #     """
+    #     Test the addition of two strings returns the two strings as one
+    #     concatenated string
+    #     """
+    #     result = calc.add2('abc', 'def')
+    #     self.assertEqual(result, 'abcdef')
 
     def test_add_string_and_integer(self):
         """
diff --git a/sources/test_calc2.py b/sources/test_calc2.py
new file mode 100644
index 0000000..28f53bc
--- /dev/null
+++ b/sources/test_calc2.py
@@ -0,0 +1,50 @@
+import unittest
+import calc
+
+class TestCalc(unittest.TestCase):
+    """
+    Test the add function from the calc library
+    """
+    # def test_fail(self):
+    #     self.assertFalse(True, msg="This is failed test")
+
+    def test_add_integers(self):
+        """
+        Test that the addition of two integers returns the correct total
+        """
+        result = calc.add2(1, 2)
+        self.assertEqual(result, 3)
+
+    def test_add_floats(self):
+        """
+        Test that the addition of two floats returns the correct result
+        """
+        result = calc.add2('10.5', 2)
+        self.assertEqual(result, 12.5)
+
+    def test_add_strings(self):
+        """
+        Test the addition of two strings returns the two strings as one
+        concatenated string
+        """
+        result = calc.add2('abc', 'def')
+        self.assertEqual(result, 'abcdef')
+
+    # def test_add_string_and_integer(self):
+    #     """
+    #     Test the addition of a string and an integer returns them as one
+    #     concatenated string (in which the integer is converted to a string)
+    #     """
+    #     result = calc.add2('abc', 3)
+    #     self.assertEqual(result, 'abc3')
+    #
+    # def test_add_string_and_number(self):
+    #     """
+    #     Test the addition of a string and a float returns them as one
+    #     concatenated string (in which the float is converted to a string)
+    #     """
+    #     result = calc.add2('abc', '5.5')
+    #     self.assertEqual(result, 'abc5.5')
+
+if __name__ == '__main__':
+    unittest.main()