resolve testing error

Author: ccleberg

test_main.py

@@ -2,7 +2,7 @@
 from main import is_even
 
 def test_is_even_with_even_number():
-    assert is_even(3) == True
+    assert is_even(4) == True
 
 def test_is_even_with_odd_number():
     assert is_even(5) == False