public object CreateObject(ExpressionCreationConditions conditions, ExpressionCreationContext context)
{
if (this.creationWithContextCallback != null) {
return this.creationWithContextCallback(context);
} else {
return this.creationCallback();
}
}
public void AddTypeToRepository()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(DateTime) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddType(typeof(DateTime));
var created = objectCreator.CreateObject(conditions, context);
// Assert
Assert.IsInstanceOf<DateTime>(created);
}
public void AddParameterlessMethodToRepository()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(int) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddMethod(new Func<int>(() => { return 5; }));
var created = objectCreator.CreateObject(conditions, context);
// Assert
Assert.AreEqual(5, created);
}
public void AddAssemblyToRepository()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 3);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(GotoExpression) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddAssembly(typeof(GotoExpression).Assembly); // System.Core
var created = objectCreator.CreateObject(conditions, context);
// Assert
Assert.IsInstanceOf<GotoExpression>(created);
}
public void AddParameterMethodToRepository()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(long) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddMethod(new Func<DateTime, DateTime, long>((time1, time2) => { return time1.Ticks + time1.Ticks; }));
objectCreator.TypeRepository.AddMethod(new Func<DateTime>(() => { return DateTime.Now; }));
var created = objectCreator.CreateObject(conditions, context);
// Assert
Assert.IsInstanceOf<long>(created);
}
public void StopEvaluatingAppropriatelyWithContext()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 3);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(int) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddMethod(new Func<int, int, int>((int1, int2) => { return int1 + int2; }));
objectCreator.TypeRepository.AddMethod(new Func<int>(() => { return 1; }));
var created = objectCreator.CreateObject(conditions, context);
// Assert
// - - - - 4 - - - (Depth 1)
// - - 2 - - - 2 - (Depth 2)
// - 1 - 1 - 1 - 1 (Depth 3)
Assert.AreEqual(4, created);
}
public void RecoverFromThrownException()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(long) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddMethod(new Func<long>(() => { throw new InvalidOperationException(); })); // Should recover
objectCreator.TypeRepository.AddMethod(new Func<long>(() => { return 10; }));
var created = objectCreator.CreateObject(conditions, context);
// Assert
Assert.AreEqual(10, created);
Assert.IsInstanceOf<Exception>(context.EvaluationExceptions[0]);
}
public void NextTest()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 3);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(int) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
// Assert
}
public void CreateObjectWithoutSufficientTypes()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(int) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act
objectCreator.TypeRepository.AddMethod(new Func<DateTime, int>((time) => { throw new InvalidOperationException(); }));
var created = objectCreator.CreateObject(conditions, context);
}
public void CreateObjectWithoutAnyTypes()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var context = new ExpressionCreationContext { RequestedReturnType = typeof(DateTime) };
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
// Act & Assert
Assert.Throws<ObjectCreationException>(() =>
{
var created = objectCreator.CreateObject(conditions, context);
});
}
public void CreateObjectWithNullContext()
{
// Arrange
var conditions = new ExpressionCreationConditions(maxDepth: 10);
var objectCreator = new DefaultObjectCreator();
objectCreator.TypeRepository = GetMockRepository();
objectCreator.TypeRepository.AddType(typeof(DateTime));
// Act
Assert.Throws<ArgumentNullException>(() =>
{
objectCreator.CreateObject(conditions, null);
});
}
public void NewExpression_MaxDepth1FromBuilder_ShouldReturnDepth1()
{
// Arrange
var builder = new RandomExpressionBuilder();
MockTestObjectCreator objectCreator = new MockTestObjectCreator(() => { return 123; });
builder.ExpressionCreator.NewObjectCreator = objectCreator;
builder.CreationConditions = new ExpressionCreationConditions(maxDepth: 1);
var creationConditions = new ExpressionCreationConditions(maxDepth: 1000);
// Act
var expression = (ConstantExpression)builder.NewExpression(ExpressionType.Add, creationConditions);
// Assert
Assert.AreEqual(123, expression.Value);
}
private void TestRequestReturnOfDoubleType(RandomExpressionBuilder builder, ExpressionCreationConditions conditions)
{
// Arrange
MockTestObjectCreator objectCreator = new MockTestObjectCreator((context) => {
if (context.RequestedReturnType == typeof(double)) {
return 2.5;
}
throw new InvalidOperationException();
});
builder.ExpressionCreator.NewObjectCreator = objectCreator;
// Act
var expression = builder.NewExpression(ExpressionType.Subtract, conditions);
// Assert
Assert.AreEqual(ExpressionType.Subtract, expression.NodeType);
Assert.AreEqual(typeof(double), expression.Type);
Assert.AreEqual(typeof(double), ((ConstantExpression)((BinaryExpression)expression).Left).Type);
Assert.AreEqual(typeof(double), ((ConstantExpression)((BinaryExpression)expression).Right).Type);
}
public void NewExpression_RequestExpressionFromNewExpresssion_CreateSpecificType()
{
// Arrange
var builder = new RandomExpressionBuilder();
var conditions = new ExpressionCreationConditions(maxDepth: 2, requestedType: typeof(double));
// Act
// Assert
this.TestRequestReturnOfDoubleType(builder, conditions);
}
public void NewExpression_RequestExpressionFromBothBuilderAndNewExpresssion_OverrideWithBuilderConditions()
{
// Arrange
var builder = new RandomExpressionBuilder();
builder.CreationConditions = new ExpressionCreationConditions(maxDepth: 2, requestedType: typeof(double));
var conditions = new ExpressionCreationConditions(maxDepth: 50, requestedType: typeof(string));
// Act
// Assert
this.TestRequestReturnOfDoubleType(builder, conditions);
}
public bool CanCreate(ExpressionCreationConditions conditions, ExpressionCreationContext context)
{
return true;
}
