tests: adding contract testing files

[nit.git] / tests / contracts_expects.nit

diff --git a/tests/contracts_expects.nit b/tests/contracts_expects.nit
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+++ b/tests/contracts_expects.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Verification if it's possible to define a simple expects contract.
+
+class MyClass
+       fun foo(x: Int)
+       is
+               expects(x > 0)
+       do
+               if x <= 0 then print "FAIL"
+       end
+end
+
+class MyClass2
+       fun foo(bool: Bool)
+       is
+               expects(not bool)
+       do
+               if bool then print "FAIL"
+       end
+end
+
+var first = new MyClass
+first.foo(1) # OK
+var second = new MyClass2
+second.foo(false) # OK