tests/contracts_abstract.nit

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   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
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   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 # Verification if it's possible to define a contract in different context (abstract class, interface and class) and it's possible to inherit it.
  16
  17 class MyClass
  18         fun foo(x: Int, y: Float)is abstract, expect(x != 10)
  19 end
  20
  21 abstract class AbstractClass
  22         fun bar(x: Int, y: Float)is abstract, expect(x >= 1), ensure(y == 10.0)
  23 end
  24
  25 interface Interface
  26         fun baz(x: Int, y: Float)is abstract, ensure(y <= 10.0, y == 42.0)
  27 end
  28
  29
  30 class MySubClass
  31         super MyClass
  32         super Interface
  33         super AbstractClass
  34
  35         redef fun foo(x: Int, y: Float)
  36         do
  37                 if x == 10 then print "Error"
  38         end
  39
  40         redef fun baz(x: Int, y: Float)
  41         do
  42
  43         end
  44
  45         redef fun bar(x: Int, y: Float)
  46         do
  47                 if x < 1 then print "Error"
  48         end
  49 end
  50
  51
  52 var first = new MySubClass
  53 first.foo(11,2.0) # Ok
  54 first.bar(1,10.0) # Ok
  55 first.baz(9,42.0) # Fail y > 10 (y = 42.0)