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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Reflection;
using Xunit;
namespace System.Linq.Expressions.Tests
{
public class IndexExpressionTests
{
[Fact]
public void UpdateSameTest()
{
var instance = new SampleClassWithProperties { DefaultProperty = new List<int> { 100, 101 } };
IndexExpression expr = instance.DefaultIndexExpression;
IndexExpression exprUpdated = expr.Update(expr.Object, expr.Arguments);
// Has to be the same, because everything is the same.
Assert.Same(expr, exprUpdated);
// Invoke to check expression.
IndexExpressionHelpers.AssertInvokeCorrect(100, expr);
IndexExpressionHelpers.AssertInvokeCorrect(100, exprUpdated);
}
[Fact]
public void UpdateTest()
{
var instance = new SampleClassWithProperties
{
DefaultProperty = new List<int> { 100, 101 },
AlternativeProperty = new List<int> { 200, 201 }
};
IndexExpression expr = instance.DefaultIndexExpression;
MemberExpression newProperty = Expression.Property(Expression.Constant(instance),
typeof(SampleClassWithProperties).GetProperty(nameof(instance.AlternativeProperty)));
ConstantExpression[] newArguments = {Expression.Constant(1)};
IndexExpression exprUpdated = expr.Update(newProperty, newArguments);
// Replace Object and Arguments of IndexExpression.
IndexExpressionHelpers.AssertEqual(
exprUpdated,
Expression.MakeIndex(newProperty, instance.DefaultIndexer, newArguments));
// Invoke to check expression.
IndexExpressionHelpers.AssertInvokeCorrect(100, expr);
IndexExpressionHelpers.AssertInvokeCorrect(201, exprUpdated);
}
}
}
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