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dfch/ContractTest.cs

Last active May 22, 2016
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C# Code Contracts and Interface Properties, http://d-fens.ch/2016/05/22/c-code-contracts-and-interface-properties
/**
* Copyright 2016 d-fens GmbH
*
* 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.
*/
using System.Runtime.CompilerServices;
using biz.dfch.CS.Utilities.General;
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Management.Automation;
using System.Web;
using System.Collections;
namespace biz.dfch.CS.General.Tests
{
public class ContractTest : IContractTest
{
public int NonZeroNumber { get; set; }
[ContractInvariantMethod]
private void ContractInvariantMethod()
{
Contract.Invariant(0 != NonZeroNumber);
}
private string _NonEmptyString;
public string NonEmptyString
{
get
{
Contract.Ensures(string.IsNullOrEmpty(Contract.Result<string>()));
return _NonEmptyString;
}
set
{
Contract.Requires(string.IsNullOrEmpty(value));
_NonEmptyString = value;
}
}
public ContractTest(int i)
{
NonZeroNumber = 0; ///< will not violate contract
NonZeroNumber = i;
}
public ContractTest(string s)
{
NonEmptyString = string.Empty; ///< will violate contract
NonEmptyString = s;
}
}
}
/**
* Copyright 2016 d-fens GmbH
*
* 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.
*/
using System.IO;
using System.Reflection;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Management.Automation;
namespace biz.dfch.CS.General.Tests
{
[TestClass]
public class ContractTestTest
{
[TestMethod]
public void ContractInvariantSucceeds()
{
// Arange
var i = 42;
// Act
var sut = new ContractTestTest(i);
// Assert
Assert.AreEqual(i, sut.NonZeroNumber);
}
[TestMethod]
[ExpectContractFailure]
public void ContractInvariantThrowsContractException()
{
// Arange
var i = 0;
// Act
var sut = new ContractTestTest(i);
// Assert
// N/A
}
[TestMethod]
[ExpectContractFailure]
public void ContractBodyThrowsContractException()
{
// Arange
var s = "arbitrary-non-empty-string";
// Act
var sut = new ContractTestTest(s);
// Assert
// N/A
}
}
}
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