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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity.SqlServer.Utilities
{
using System.Data.Entity.Core.Common.CommandTrees;
using System.Linq;
using Moq;
using Xunit;
public class DbExpressionExtensionsTests
{
[Fact]
public void GetLeafNodes_returns_just_the_given_expression_if_it_is_not_of_requested_kind()
{
var mockExpression = CreateMockExpression(DbExpressionKind.Multiply);
var result = mockExpression.Object.GetLeafNodes(DbExpressionKind.Not, e => Enumerable.Empty<DbExpression>());
Assert.Equal(new[] { mockExpression.Object }, result);
}
[Fact]
public void GetLeafNodes_flatterns_a_given_tree()
{
var mockRoot = CreateMockExpression(DbExpressionKind.Multiply);
var mockChildOne = CreateMockExpression(DbExpressionKind.Multiply);
var mockChildTwo = CreateMockExpression(DbExpressionKind.Not);
var mockChildThree = CreateMockExpression(DbExpressionKind.Not);
var mockChildFour = CreateMockExpression(DbExpressionKind.Not);
var result = mockRoot.Object.GetLeafNodes(
DbExpressionKind.Multiply,
e =>
{
if (e == mockRoot.Object)
{
return new[] { mockChildOne.Object, mockChildTwo.Object };
}
if (e == mockChildOne.Object)
{
return new[] { mockChildThree.Object, mockChildFour.Object };
}
return Enumerable.Empty<DbExpression>();
}).ToList();
Assert.Equal(new[] { mockChildThree.Object, mockChildFour.Object, mockChildTwo.Object }, result);
}
private static Mock<DbExpression> CreateMockExpression(DbExpressionKind kind)
{
var mockRoot = new Mock<DbExpression>();
mockRoot.Setup(m => m.ExpressionKind).Returns(kind);
return mockRoot;
}
}
}
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