added exercise 1

test_ex1.py

@@ -0,0 +1,20 @@
+import unittest
+
+from ex1_triangles import countTriangles
+
+
+class MyTestCase(unittest.TestCase):
+    def test_simple1(self):
+        self.assertEqual(
+            countTriangles([(0, 1), (1, 2), (0, 2)]),
+            1
+        )
+    def test_simple2(self):
+        self.assertEqual(
+            countTriangles([(2, 1), (1, 2), (2, 3)]),
+            0
+        )
+
+
+if __name__ == '__main__':
+    unittest.main()