add test functions with wrong results to see how it breaks

hands_on/first/test_first.py

@@ -1,6 +1,14 @@
+from first import times_3
+
 def test_times_3_integer():
-    pass
+    value = 5
+    expected = 150
+    result = times_3(value)
+    assert result == expected
 
 
 def test_times_3_string():
-    pass
+    value = 'yupi'
+    expected = 'yupiyupiyupiyu'
+    result = times_3(value)
+    assert result == expected