tests/contracts.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 # Test the creation ans the usage on simply contract, in the same time check the no modification of the parameter.
  16 # See the `foo` method in `Myclass` the change of x in a body method has no effect on the ensure because x is a primitive type and it's given by copy and not by reference.
  17
  18 class MyClass
  19         fun foo(x: Int)
  20         is
  21                 expect(x == 1)
  22                 ensure(x > 0)
  23         do
  24                 x = 0
  25         end
  26 end
  27
  28 class MyClass2
  29         fun foo(bool: Bool)
  30         is
  31                 expect(not bool)
  32                 ensure(not bool)
  33         do
  34                 if bool then print "Error"
  35         end
  36 end
  37
  38 var first = new MyClass
  39 first.foo(1)
  40 var second = new MyClass2
  41 second.foo(true) #Fail