-('i' < 0)
  |-[+]_/ERROR: java.lang.AssertionError
  +-[-]-('i' >= 2)
        |-[+]-('i' != 2)
        |      |-[+]_/ERROR: java.lang.AssertionError
        |      +-[-]-('f1' != 'f2')
        |            |-[+]-('f2' != 'f3')
        |            |      |-[+]_/OK: [  ]
        |            |      +-[-]_/OK: [  ]
        |            +-[-]-('f2' != 'f3')
        |                  |-[+]_/OK: [  ]
        |                  +-[-]_/OK: [  ]
        +-[-]-((double)'f2' != 3.141)
              |-[+]_/ERROR: java.lang.AssertionError
              +-[-]_/DONT_KNOW