tests/contracts_expects_1.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Check if the contract is inherited
  16
  17 class MyClass
  18         fun foo(x: Int)
  19         is
  20                 expect(x > 0)
  21         do
  22                 if x <= 0 then print "FAIL"
  23         end
  24 end
  25
  26 class SubClass
  27         super MyClass
  28
  29         redef fun foo(x: Int) do
  30                 if x <= 0 then print "FAIL"
  31         end
  32 end
  33
  34 var first = new MyClass
  35 first.foo(1) # OK
  36 var sub = new SubClass
  37 sub.foo(0) # Fail