changes to test,hello and yaml

.gitlab-ci.yml

 stages:
- - build
+ - test
 
 test_app:
  image: python:3.6
- stage: build
+ stage: test
 
  before_script:
  - python3 -V
@@ -12,9 +12,8 @@ test_app:
  - python3 -m venv venv
  - python3 -m venv python3-virtualenv
  - source python3-virtualenv/bin/activate
- - pwd
  script:
  - pip install Flask
- - python hello.py
+ - python test.py
  tags:
  - ci 

hello.py

-import flask
-
-app = flask.Flask(__name__)
-app.config["DEBUG"] = True
+#import flask
+from flask import Flask, request
+#app = flask.Flask(__name__)
+#app.config["DEBUG"] = True
+app = Flask(__name__)
 
 
 @app.route('/', methods=['GET'])
 def home():
     return "<h1>HelloO DevOps people</h1><p>This site is a prototype API for greeting Nisum DevOps!</p>"
 
-app.run(host='myApp.com', port=5000)
+#app.run(host='myApp.com', port=5000)
+
+@app.route('/')
+def calc():
+   a = int(request.args.get('a'))
+   b = int(request.args.get('b'))
+
+   return str(sum(a, b))
+
+def sum(a, b):
+   return a + b

test.py

+import unittest
+from hello import sum
+
+class Test(unittest.TestCase):
+
+    def test_sum(self):
+        value = sum(4, 5)
+        self.assertEqual(value, 9)
+
+if __name__ == '__main__':
+    unittest.main()