public void Visit_Null()
{
var visitor = new DelegateBasedExpressionVisitor(exp => { Assert.Fail("Should not be called."); return(null); });
var result = visitor.Visit(node: null);
Assert.That(result, Is.Null);
}
public void Visit_Changes()
{
var fakeExpression = ExpressionTreeObjectMother.GetSomeExpression();
Func <Expression, Expression> delegate_ = exp => fakeExpression;
var visitor = new DelegateBasedExpressionVisitor(delegate_);
var expression = ExpressionTreeObjectMother.GetSomeExpression();
var result = visitor.Visit(expression);
Assert.That(result, Is.SameAs(fakeExpression));
}
public void Visit_NoChanges()
{
var visitedExpressions = new List <Expression>();
Func <Expression, Expression> delegate_ = exp =>
{
visitedExpressions.Add(exp);
return(exp);
};
var visitor = new DelegateBasedExpressionVisitor(delegate_);
var expression1 = ExpressionTreeObjectMother.GetSomeExpression();
var expression2 = ExpressionTreeObjectMother.GetSomeExpression();
var blockExpression = Expression.Block(expression1, expression2);
var result = visitor.Visit(blockExpression);
Assert.That(result, Is.SameAs(blockExpression));
Assert.That(visitedExpressions, Is.EqualTo(new[] { expression1, expression2, blockExpression }));
}