sum feature added

.gitlab-ci.yml

+
+variables:
+  example: this is an example variable
+
+stages:
+  - stage1
+  - stage2
+
+build:
+  stage: stage1
+  script:
+    - echo "We are currently in stage 1"
+    - echo "These are the contents of test.py"
+    - cat test.py
+    - echo $example
+
+test:
+  stage: stage2
+  script:
+    - echo "We are currently in stage 2"
+    - echo "running python script"
+    - python3 test.py
+    - if [ $? -ne 0 ]; then
+        echo "Unit tests failed. Exiting pipeline.";
+        exit 1;
+      else
+        echo "Unit tests passed. Continuing to next stage.";
+      fi

sum.py

+def add(a, b):
+    return a+b
\ No newline at end of file

test.py

+import unittest
+import sum
+import sys
+
+class TestCalculator(unittest.TestCase):
+
+    def test_addition(self):
+        result = sum.add(2, 2)
+        self.assertEqual(result, 4)
+
+    def test_add_positive_and_negative_numbers(self):
+        result = sum.add(-2, 3)
+        self.assertEqual(result, 1)
+
+    def test_add_negative_numbers(self):
+        result = sum.add(-2, -3)
+        self.assertEqual(result, -5)
+
+    def test_add_zero(self):
+        result = sum.add(0, 5)
+        self.assertEqual(result, 5)
+
+    def test_add_large_numbers(self):
+        result = sum.add(123456789, 987654321)
+        self.assertEqual(result, 1111111110)
+    
+    
+
+suite = unittest.TestLoader().loadTestsFromTestCase(TestCalculator)
+result = unittest.TextTestRunner(verbosity=2).run(suite)
+if result.wasSuccessful():
+    print("All tests passed!")
+else:
+    print("Some tests failed.")
+    sys.exit(1)
+
+if __name__ == '__main__':
+    unittest.main()