add unit test last case

src/tests/unit/test_app.py

@@ -9,6 +9,8 @@ from src import app
 
 class TestApp(TestCase):
     """Unit test class to test other methods in the app."""
+
+    """create symlink"""
     def test_symlink_correct(self):
         os.mknod(os.path.join("./","testFile1.txt"))
         app.symlink_force(os.path.join("./","testFile1.txt"),os.path.join("./","link_testFile1.txt"))
@@ -22,6 +24,11 @@ class TestApp(TestCase):
         app.symlink_force(os.path.join("./","testFile2.txt"),os.path.join("./","link_testFile2.txt"))
         os.remove(os.path.join("./","testFile2.txt"))
         os.remove(os.path.join("./","link_testFile2.txt"))
+    
+    """test if other exception pop"""
+    def test_symlink_other_except(self):
+        with self.assertRaises(Exception):
+            app.symlink_force(os.path.join("./","testFile3.txt"),os.path.join("./","link_testFile3.txt"))
 
     def test_valid_env(self):
         key = 'ENV_1'