text: // Copyright (c) rubicon IT GmbH, www.rubicon.eu
  //
  // See the NOTICE file distributed with this work for additional information
  // regarding copyright ownership.  rubicon licenses this file to you 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;
  using System.Linq.Expressions;
  using NUnit.Framework;
  using Remotion.Linq.Development.UnitTesting;
  using Remotion.Linq.Parsing.Structure.IntermediateModel;
  using Remotion.Linq.UnitTests.Parsing.Structure.IntermediateModel.TestDomain;
  using Remotion.Linq.UnitTests.TestDomain;
  
  namespace Remotion.Linq.UnitTests.Parsing.Structure.IntermediateModel
  {
    [TestFixture]
    public class ResolvedExpressionCacheTest
    {
      private ResolvedExpressionCache<Expression> _cache;
  
      [SetUp]
      public void SetUp ()
      {
        var parseInfo = new MethodCallExpressionParseInfo("x", ExpressionNodeObjectMother.CreateMainSource(), ExpressionHelper.CreateMethodCallExpression<Cook>());
        _cache = new ResolvedExpressionCache<Expression> (new TestMethodCallExpressionNode (parseInfo, null));
      }
  
      [Test]
      public void GetOrCreate_Initial ()
      {
        var fakeResult = ExpressionHelper.CreateExpression ();
        var result = _cache.GetOrCreate (r => fakeResult);
  
        Assert.That (result, Is.SameAs (fakeResult));
      }
  
      [Test]
      public void GetOrCreate_Twice ()
      {
        var fakeResult = ExpressionHelper.CreateExpression ();
        var result1 = _cache.GetOrCreate (r => fakeResult);
  
        var calledASecondTime = false;
        var result2 = _cache.GetOrCreate (r => { calledASecondTime = true; return null; } );
  
        Assert.That (result2, Is.SameAs (result1));
        Assert.That (calledASecondTime, Is.False);
      }
    }
  }
  