- assert !alice.is_friends_with?(charlie)
- assert !bob.is_friends_with?(alice)
- assert !bob.is_friends_with?(charlie)
- assert !charlie.is_friends_with?(bob)
- assert !charlie.is_friends_with?(alice)
+ assert_not alice.is_friends_with?(charlie)
+ assert_not bob.is_friends_with?(alice)
+ assert_not bob.is_friends_with?(charlie)
+ assert_not charlie.is_friends_with?(bob)
+ assert_not charlie.is_friends_with?(alice)